ULNRC-06341, Callaway Plant Unit 1 - Enclosure 8 - 10-Q Filed Period 9/30/2016

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Callaway Plant Unit 1 - Enclosure 8 - 10-Q Filed Period 9/30/2016
ML16348A382
Person / Time
Site: Callaway Ameren icon.png
Issue date: 09/30/2016
From:
Ameren Missouri, Union Electric Co
To:
Office of Nuclear Security and Incident Response, Division of Security Operations
Shared Package
ML16348A372 List:
References
ULNRC-06341
Download: ML16348A382 (78)


Text

Enclosure 8 to ULNRC-06341

10-Q FILED PERIOD 9/30/2016 UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549 FORM 10-QQuarterly report pursuant to Section13 or 15(d) of the Securities Exchange Act of 1934 for the Quarterly Period Ended September 30, 2016 ORTransition report pursuant to Section13 or 15(d) of the Securities Exchange Act of 1934

for the transition period from to Commission

File Number Exactnameofregistrantasspecifiedinitscharter;

State of Incorporation; Address and Telephone Number IRS Employer

Identification No.

1-14756Ameren Corporation43-1723446(Missouri Corporation) 1901 Chouteau Avenue St. Louis, Missouri 63103 (314) 621-3222 1-2967Union Electric Company43-0559760(Missouri Corporation) 1901 Chouteau Avenue St. Louis, Missouri 63103 (314) 621-3222 1-3672Ameren Illinois Company37-0211380(Illinois Corporation) 6 Executive Drive Collinsville, Illinois 62234 (618) 343-8150 Indicate by check mark whether the registrants: (1)have filed all reports required to be filed by Section13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2)have been subject to such filing requirements for the past 90 days.

Ameren CorporationYesNoUnion Electric CompanyYesNoAmeren Illinois CompanyYesNoIndicate by check mark whether each registrant has submitted electronically and posted on its corporate website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Ameren CorporationYesNoUnion Electric CompanyYesNoAmeren Illinois CompanyYesNoIndicate by check mark whether each registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

LargeAccelerated FilerAccelerated FilerNon-Accelerated FilerSmallerReporting Company Ameren Corporation Union Electric Company Ameren Illinois Company Indicate by check mark whether each registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Ameren CorporationYesNoUnion Electric CompanyYesNoAmeren Illinois CompanyYesNoThe number of shares outstanding of each registrant's classes of common stock as of October 31, 2016, was as follows:

Ameren Corporation Common stock, $0.01 par value per share 242,634,798 Union Electric Company Common stock, $5 par value per share, held by Ameren Corporation 102,123,834 Ameren Illinois Company Common stock, no par value, held by Ameren

Corporation 25,452,373

______________________________________________________________________________________________________This combined Form 10-Q is separately filed by Ameren Corporation, Union Electric Company, and Ameren Illinois Company. Each registrant hereto is filing on its own behalf all of the information contained in this quarterly report that relates to such registrant. Each

registrant hereto is not filing any information that does not relate to such registrant, and therefore makes no representation as to any such

information.

TABLE OF CONTENTS PageGlossary of Terms and Abbreviations Forward-looking StatementsPART I Financial Information Item1.Financial Statements (Unaudited)

Ameren Corporation Consolidated Statement of Income Consolidated Statement of Comprehensive Income Consolidated Balance Sheet Consolidated Statement of Cash Flows Union Electric Company (d/b/a Ameren Missouri)

Statement of Income and Comprehensive Income Balance Sheet Statement of Cash Flows Ameren Illinois Company (d/b/a Ameren Illinois)

Statement of Income and Comprehensive Income Balance Sheet Statement of Cash Flows Combined Notes to Financial Statements Item2.Management's Discussion and Analysis of Financial Condition and Results of Operations Item3.Quantitative and Qualitative Disclosures About Market Risk Item4.Controls and ProceduresPART II Other Information

Item1.Legal Proceedings Item1A.Risk Factors Item2.Unregistered Sales of Equity Securities and Use of Proceeds Item6.Exhibits SignaturesThis report contains "forward-looking" statements within the meaning of Section21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements should be read with the cautionary statements and important factors under the heading "Forward-looking Statements." Forward-looking statements are all statements other than statements of historical fact, including those statements that

are identified by the use of the words "anticipates," "estimates," "expects," "intends," "plans," "predicts," "projects," and similar expressions.

1 1 3 3 3 4 5 6 7 7 8 9 10 1011 12 13 37 58 59 60 60 60 61 62 1GLOSSARY OF TERMS AND ABBREVIATIONSWe use the words "our," "we" or "us" with respect to certain information that relates to Ameren, Ameren Missouri, and Ameren Illinois, collectively. When appropriate, subsidiaries of Ameren

Corporation are named specifically as their various business

activities are discussed. Refer to the Form 10-K for a complete

listing of glossary terms and abbreviations. Only new or

significantly changed terms and abbreviations are included below.Form 10-K - The combined Annual Report on Form 10-K for the year ended December 31, 2015, filed by the Ameren Companies

with the SEC.

MEEIA 2013 - Ameren Missouri's portfolio of customer energy efficiency programs, net shared benefits, and performance

incentive for 2013 through 2015, as approved by the MoPSC in

August 2012.

MEEIA 2016 - Ameren Missouri's portfolio of customer energy efficiency programs, throughput disincentive, and performance

incentive for March 2016 through February 2019, as approved by

the MoPSC in February 2016.

MoOPC - Missouri Office of Public Counsel.

New Madrid Smelter - Aluminum smelter located in southeast

Missouri that was formerly owned by Noranda. Noranda sold the New Madrid Smelter to ARG International AG in October 2016.FORWARD-LOOKING STATEMENTS Statements in this report not based on historical facts are considered "forward-looking" and, accordingly, involve risks and uncertainties that could cause actual results to differ materially from those discussed. Although such forward-looking statements

have been made in good faith and are based on reasonable

assumptions, there is no assurance that the expected results will be achieved. These statements include (without limitation)

statements as to future expectations, beliefs, plans, strategies, objectives, events, conditions, and financial performance. In

connection with the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995, we are providing this

cautionary statement to identify important factors that could cause actual results to differ materially from those anticipated.

The following factors, in addition to those discussed under Risk

Factors in the Form 10-K, and elsewhere in this report and in our other filings with the SEC, could cause actual results to differ

materially from management expectations suggested in such

forward-looking statements:* regulatory, judicial, or legislative actions, including changes in regulatory policies and ratemaking determinations, such as those that may result from the complaint case filed in

February 2015 with the FERC seeking a reduction in the

allowed base return on common equity under the MISO tariff, Ameren Missouri's July 2016 electric rate case filing, Ameren Missouri's appeal of a MoPSC order that clarified

the method applied to determine an input used to calculate its performance incentive under MEEIA 2013, Ameren Illinois' April 2016 annual electric distribution service formula rate update filing, and future regulatory, judicial, or

legislative actions that change regulatory recovery

mechanisms;* the effect of Ameren Illinois participating in a performance-based formula ratemaking process under the IEIMA, including the direct relationship between Ameren Illinois'

return on common equity and 30-year United States Treasury bond yields, the related financial commitments

required by the IEIMA;* our ability to align our overall spending, both operating and capital, with regulatory frameworks established by our

regulators in an attempt to earn our allowed return on equity;

  • the effects of changes in federal, state or local laws and other governmental actions, including monetary, fiscal, tax, and energy policies;* the effects of changes in federal, state, or local tax laws, regulations, interpretations, or rates and any challenges to the tax positions taken by the Ameren Companies;* the effects on demand for our services resulting from technological advances, including advances in customer energy efficiency and private generation sources, which

generate electricity at the site of consumption and are

becoming more cost-competitive;* the effectiveness of Ameren Missouri's customer energy efficiency programs and the related revenues and performance incentives earned under its MEEIA plans;* the timing of increasing capital expenditure and operating expense requirements and our ability to recover these costs

in a timely manner;* the cost and availability of fuel, such as coal, natural gas, and enriched uranium used to produce electricity; the cost

and availability of purchased power and natural gas for

distribution; and the level and volatility of future market

prices for such commodities, including our ability to recover

the costs for such commodities and our customers'

tolerance for the related rate increases;* disruptions in the delivery of fuel, failure of our fuel suppliers to provide adequate quantities or quality of fuel, or lack of

adequate inventories of fuel, including ultra-low-sulfur coal used for Ameren Missouri's compliance with environmental

regulations;* the effectiveness of our risk management strategies and our use of financial and derivative instruments;

  • the ability to obtain sufficient insurance, including insurance relating to Ameren Missouri's Callaway energy center, or, in

the absence of insurance, the ability to recover uninsured

losses from our customers;* business and economic conditions, including their impact on key customers, interest rates, collection of our receivable

balances, and demand for our products;

  • suspended operations at the New Madrid Smelter, and the resulting impacts to Ameren Missouri's ability to recover its

revenue requirement in its July 2016 electric rate case and

future rate cases to accurately reflect the New Madrid Smelter's actual sales volumes;* disruptions of the capital markets, deterioration in credit metrics of the Ameren Companies, or other events that may have an adverse effect on the cost or availability of capital, including short-term credit and liquidity; 2* the actions of credit rating agencies and the effects of such actions;

  • the impact of adopting new accounting guidance and the application of appropriate accounting rules and guidance;
  • the impact of weather conditions and other natural phenomena on us and our customers, including the impact

of system outages;* the construction, installation, performance, and cost recovery of generation, transmission, and distribution

assets;* the effects of breakdowns or failures of equipment in the operation of natural gas distribution and transmission

systems and storage facilities, such as leaks, explosions

and mechanical problems, and compliance with natural gas

safety regulations;* the effects of our increasing investment in electric transmission projects, our ability to obtain all of the

necessary approvals to complete the projects, and the

uncertainty as to whether we will achieve our expected

returns in a timely manner;* operation of Ameren Missouri's Callaway energy center, including planned and unplanned outages, and

decommissioning costs;

  • the effects of strategic initiatives, including mergers, acquisitions, and divestitures, and any related tax

implications;

  • the impact of current environmental regulations and new, more stringent, or changing requirements, including those

related to CO 2 , other emissions and discharges, cooling water intake structures, CCR, and energy efficiency, that are

enacted over time and that could limit or terminate the operation of certain of Ameren Missouri's energy centers, increase our costs or investment requirements, result in an

impairment of our assets, cause us to sell our assets, reduce our customers' demand for electricity or natural gas, or otherwise have a negative financial effect;

  • the impact of complying with renewable energy portfolio requirements in Missouri;* labor disputes, work force reductions, future wage and employee benefits costs, including changes in discount

rates, mortality tables, and returns on benefit plan assets;

  • the inability of our counterparties to meet their obligations with respect to contracts, credit agreements, and financial

instruments;

  • the cost and availability of transmission capacity for the energy generated by Ameren Missouri's energy centers or required to satisfy Ameren Missouri's energy sales;
  • legal and administrative proceedings;
  • the impact of cyber attacks, which could result in the loss of operational control of energy centers and electric and

natural gas transmission and distribution systems and/or the

loss of data, such as customer data and account

information; and* acts of sabotage, war, terrorism, or other intentionally disruptive acts.

New factors emerge from time to time, and it is not possible for management to predict all of such factors, nor can it assess

the impact of each such factor on the business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained or implied in any

forward-looking statement. Given these uncertainties, undue

reliance should not be placed on these forward-looking

statements. Except to the extent required by the federal

securities laws, we undertake no obligation to update or revise

publicly any forward-looking statements to reflect new information

or future events.

3PART I. FINANCIAL INFORMATIONITEM 1. FINANCIAL STATEMENTS.

AMEREN CORPORATIONCONSOLIDATED STATEMENT OF INCOME (Unaudited) (In millions, except per share amounts)

Three Months Ended September 30, Nine Months Ended September 30,2016201520162015 Operating Revenues:

Electric$1,725$1,700$4,101$4,093 Gas 134 133 619 697 Total operating revenues 1,859 1,833 4,720 4,790 Operating Expenses:

Fuel 205 259 574 670 Purchased power 178 153 451 393 Gas purchased for resale 34 38 227 320 Other operations and maintenance 411 428 1,246 1,256 Provision for Callaway construction and operating license (Note 2)

---69 Depreciation and amortization 211 201 628 594 Taxes other than income taxes 129 128 358 369 Total operating expenses 1,168 1,207 3,484 3,671 Operating Income 691 626 1,236 1,119 Other Income and Expense:

Miscellaneous income 18 19 54 54 Miscellaneous expense 8 5 21 22 Total other income 10 14 33 32 Interest Charges 97 87 287 264 Income Before Income Taxes 604 553 982 887 Income Taxes 233 208 356 333 Income from Continuing Operations 371 345 626 554 Income from Discontinued Operations, Net of Taxes

---52 Net Income 371 345 626 606 Less: Net Income from Continuing Operations Attributable to Noncontrolling Interests 2 2 5 5 Net Income Attributable to Ameren Common Shareholders:

Continuing Operations 369 343 621 549 Discontinued Operations

---52 Net Income Attributable to Ameren Common Shareholders$369$343$621$601 Earnings per Common Share - Basic:

Continuing Operations$1.52$1.42$2.56$2.27 Discontinued Operations

---0.21 Earnings per Common Share - Basic$1.52$1.42$2.56$2.48 Earnings per Common Share - Diluted:

Continuing Operations$1.52$1.41$2.56$2.26 Discontinued Operations

---0.21 Earnings per Common Share - Diluted$1.52$1.41$2.56$2.47 Dividends per Common Share$0.425$0.41$1.275$1.23 Average Common Shares Outstanding - Basic 242.6 242.6 242.6 242.6 Average Common Shares Outstanding - Diluted 242.9 243.9 243.0 243.8 The accompanying notes are an integral part of these consolidated financial statements.

4AMEREN CORPORATIONCONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) (In millions)

Three Months Ended September 30, Nine Months Ended September 30,2016201520162015 Income from Continuing Operations$371$345$626$554 Other Comprehensive Income from Continuing Operations, Net of TaxesPension and other postretirement benefit plan activity, net of income taxes of

$-, $-, $4, and $4, respectively(1)-1 4 Comprehensive Income from Continuing Operations 370 345 627 558 Less: Comprehensive Income from Continuing Operations Attributable to Noncontrolling Interests 2 2 5 5 Comprehensive Income from Continuing Operations Attributable to Ameren Common Shareholders 368 343 622 553 Comprehensive Income from Discontinued Operations Attributable to

Ameren Common Shareholders

---52Comprehensive Income Attributable to Ameren Common Shareholders$368$343$622$605 The accompanying notes are an integral part of these consolidated financial statements.

5AMEREN CORPORATIONCONSOLIDATED BALANCE SHEET (Unaudited) (In millions, except per share amounts)

September 30, 2016 December 31, 2015 ASSETS Current Assets:

Cash and cash equivalents$18$292 Accounts receivable - trade (less allowance for doubtful accounts of $19 and $19, respectively) 543 388 Unbilled revenue 240 239 Miscellaneous accounts receivable 49 98 Materials and supplies 551 538 Current regulatory assets 107 260 Other current assets 76 88 Assets of discontinued operations 15 14 Total current assets 1,599 1,917 Property and Plant, Net 19,647 18,799 Investments and Other Assets:

Nuclear decommissioning trust fund 599 556 Goodwill 411 411 Regulatory assets 1,312 1,382 Other assets 566 575 Total investments and other assets 2,888 2,924 TOTAL ASSETS$24,134$23,640 LIABILITIES AND EQUITY Current Liabilities:

Current maturities of long-term debt$431$395 Short-term debt 608 301 Accounts and wages payable 513 777 Taxes accrued 159 43 Interest accrued 110 89 Customer deposits 104 100 Current regulatory liabilities 87 80 Other current liabilities 252 279 Liabilities of discontinued operations 27 29 Total current liabilities 2,291 2,093 Long-term Debt, Net 6,607 6,880 Deferred Credits and Other Liabilities:

Accumulated deferred income taxes, net 4,255 3,885 Accumulated deferred investment tax credits 56 60 Regulatory liabilities 1,974 1,905 Asset retirement obligations 636 618 Pension and other postretirement benefits 499 580 Other deferred credits and liabilities 481 531 Total deferred credits and other liabilities 7,901 7,579 Commitments and Contingencies (Notes 2, 9, and 10)

Ameren Corporation Shareholders' Equity:

Common stock, $.01 par value, 400.0 shares authorized - shares outstanding of 242.6 2 2 Other paid-in capital, principally premium on common stock 5,550 5,616 Retained earnings 1,643 1,331 Accumulated other comprehensive loss(2)(3)Total Ameren Corporation shareholders' equity 7,193 6,946 Noncontrolling Interests 142 142 Total equity 7,335 7,088 TOTAL LIABILITIES AND EQUITY$24,134$23,640 The accompanying notes are an integral part of these consolidated financial statements.

6 AMEREN CORPORATION CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited) (In millions)

Nine Months Ended September 30,2016 2015 Cash Flows From Operating Activities:

Net income

$626$606 Income from discontinued operations, net of taxes

-(52)Adjustments to reconcile net income to net cash provided by operating activities:

Provision for Callaway construction and operating license

-69 Depreciation and amortization 625 582 Amortization of nuclear fuel 63 71 Amortization of debt issuance costs and premium/discounts 17 16 Deferred income taxes and investment tax credits, net 364 318 Allowance for equity funds used during construction(20)(19)Share-based compensation costs 17 20 Other(9)(8)Changes in assets and liabilities:

Receivables(134)(71)Materials and supplies(13)(23)Accounts and wages payable(196)(172)Taxes accrued 119 116 Regulatory assets and liabilities 146 74 Assets, other 9 17 Liabilities, other(29)(26)Pension and other postretirement benefits(26)29 Net cash provided by operating activities - continuing operations 1,559 1,547 Net cash used in operating activities - discontinued operations

-(5)Net cash provided by operating activities 1,559 1,542 Cash Flows From Investing Activities:

Capital expenditures(1,496)(1,332)Nuclear fuel expenditures(41)(30)Purchases of securities - nuclear decommissioning trust fund(310)(301)Sales and maturities of securities - nuclear decommissioning trust fund 297 290 Proceeds from note receivable - Marketing Company

-12 Contributions to note receivable - Marketing Company

-(8)Other(1)7 Net cash used in investing activities - continuing operations(1,551)(1,362)Net cash used in investing activities - discontinued operations

--Net cash used in investing activities(1,551)(1,362)Cash Flows From Financing Activities:

Dividends on common stock(309)(298)Dividends paid to noncontrolling interest holders(5)(5)Short-term debt, net 307 69 Maturities of long-term debt(389)(114)Issuances of long-term debt 149 249 Employee withholding taxes related to share-based payments(32)(12)Capital issuance costs(1)(2)Other(2)-Net cash used in financing activities - continuing operations(282)(113)Net change in cash and cash equivalents(274)67 Cash and cash equivalents at beginning of year 292 5 Cash and cash equivalents at end of period

$18$72 The accompanying notes are an integral part of these consolidated financial statements.

7 UNION ELECTRIC COMPANY (d/b/a AMEREN MISSOURI)STATEMENT OF INCOME AND COMPREHENSIVE INCOME (Unaudited) (In millions)

Three Months Ended September 30, Nine Months Ended September 30,2016201520162015 Operating Revenues:

Electric$1,144$1,151$2,682$2,752 Gas 20 19 90 101 Other 1 1 1 2 Total operating revenues 1,165 1,171 2,773 2,855 Operating Expenses:

Fuel 205 259 574 670 Purchased power 77 29 169 87 Gas purchased for resale 6 5 33 43 Other operations and maintenance 220 233 670 673 Provision for Callaway construction and operating license (Note 2)

---69 Depreciation and amortization 130 125 384 367 Taxes other than income taxes 96 97 252 262 Total operating expenses 734 748 2,082 2,171 Operating Income 431 423 691 684 Other Income and Expense:

Miscellaneous income 14 14 38 37 Miscellaneous expense 2 3 6 8 Total other income 12 11 32 29 Interest Charges 53 54 158 164 Income Before Income Taxes 390 380 565 549 Income Taxes 148 140 215 205 Net Income 242 240 350 344 Other Comprehensive Income


Comprehensive Income$242$240$350$344 Net Income$242$240$350$344 Preferred Stock Dividends 1 1 3 3 Net Income Available to Common Shareholder$241$239$347$341The accompanying notes as they relate to Ameren Missouri are an integral part of these financial statements.

8UNION ELECTRIC COMPANY (d/b/a AMEREN MISSOURI)

BALANCE SHEET (Unaudited) (In millions, except per share amounts)

September 30, 2016 December 31, 2015 ASSETS Current Assets:

Cash and cash equivalents$1$199 Advances to money pool 201 36 Accounts receivable - trade (less allowance for doubtful accounts of $7 and $7, respectively) 272 174 Accounts receivable - affiliates 20 54 Unbilled revenue 144 128 Miscellaneous accounts receivable 33 78 Materials and supplies 392 387 Current regulatory assets 47 89 Other current assets 37 41 Total current assets 1,147 1,186 Property and Plant, Net 11,294 11,183 Investments and Other Assets:

Nuclear decommissioning trust fund 599 556 Regulatory assets 514 605 Other assets 335 321 Total investments and other assets 1,448 1,482 TOTAL ASSETS$13,889$13,851 LIABILITIES AND SHAREHOLDERS' EQUITY Current Liabilities:

Current maturities of long-term debt$431$266 Accounts and wages payable 209 417 Accounts payable - affiliates 89 56 Taxes accrued 149 31 Interest accrued 66 59 Current regulatory liabilities 11 28 Other current liabilities 116 120 Total current liabilities 1,071 977 Long-term Debt, Net 3,569 3,844 Deferred Credits and Other Liabilities:

Accumulated deferred income taxes, net 3,003 2,844 Accumulated deferred investment tax credits 54 58 Regulatory liabilities 1,211 1,172 Asset retirement obligations 630 612 Pension and other postretirement benefits 183 234 Other deferred credits and liabilities 21 28 Total deferred credits and other liabilities 5,102 4,948 Commitments and Contingencies (Notes 2, 8, 9, and 10)

Shareholders' Equity:

Common stock, $5 par value, 150.0 shares authorized - 102.1 shares outstanding 511 511 Other paid-in capital, principally premium on common stock 1,824 1,822 Preferred stock 80 80 Retained earnings 1,732 1,669 Total shareholders' equity 4,147 4,082 TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY$13,889$13,851The accompanying notes as they relate to Ameren Missouri are an integral part of these financial statements.

9UNION ELECTRIC COMPANY (d/b/a AMEREN MISSOURI)STATEMENT OF CASH FLOWS (Unaudited) (In millions)

Nine Months Ended September 30,2016 2015 Cash Flows From Operating Activities:

Net income

$350$344 Adjustments to reconcile net income to net cash provided by operating activities:

Provision for Callaway construction and operating license

-69 Depreciation and amortization 381 356 Amortization of nuclear fuel 63 71 Amortization of debt issuance costs and premium/discounts 5 5 Deferred income taxes and investment tax credits, net 159 88 Allowance for equity funds used during construction(16)(16)Other-1 Changes in assets and liabilities:

Receivables(95)(51)Materials and supplies(5)(26)Accounts and wages payable(176)(177)Taxes accrued 165 243 Regulatory assets and liabilities 60 101 Assets, other(8)6 Liabilities, other 13 11 Pension and other postretirement benefits(8)15 Net cash provided by operating activities 888 1,040 Cash Flows From Investing Activities:

Capital expenditures(500)(444)Nuclear fuel expenditures(41)(30)Purchases of securities - nuclear decommissioning trust fund(310)(301)Sales and maturities of securities - nuclear decommissioning trust fund 297 290 Money pool advances, net(165)(250)Other(5)(4)Net cash used in investing activities(724)(739)Cash Flows From Financing Activities:

Dividends on common stock(285)(490)Dividends on preferred stock(3)(3)Short-term debt, net

-(97)Maturities of long-term debt(260)(114)Issuances of long-term debt 149 249 Capital contribution from parent 38 224 Capital issuance costs(1)(2)Net cash used in financing activities(362)(233)Net change in cash and cash equivalents(198)68 Cash and cash equivalents at beginning of year 199 1 Cash and cash equivalents at end of period

$1$69The accompanying notes as they relate to Ameren Missouri are an integral part of these financial statements.

10 AMEREN ILLINOIS COMPANY (d/b/a AMEREN ILLINOIS)STATEMENT OF INCOME AND COMPREHENSIVE INCOME (Unaudited) (In millions)

Three Months Ended September 30, Nine Months Ended September 30,2016201520162015 Operating Revenues:

Electric$562$540$1,365$1,316 Gas 114 115 530 597 Total operating revenues 676 655 1,895 1,913 Operating Expenses:

Purchased power 110 128 304 317 Gas purchased for resale 28 33 194 277 Other operations and maintenance 198 202 592 606 Depreciation and amortization 80 74 237 220 Taxes other than income taxes 30 29 98 101 Total operating expenses 446 466 1,425 1,521 Operating Income 230 189 470 392 Other Income and Expense:

Miscellaneous income 4 4 15 15 Miscellaneous expense 3 3 11 10 Total other income 1 1 4 5 Interest Charges 35 33 105 99 Income Before Income Taxes 196 157 369 298 Income Taxes 77 59 144 114 Net Income 119 98 225 184 Other Comprehensive Loss, Net of Taxes:Pension and other postretirement benefit plan activity, net of income taxes (benefit) of $(1), $(1), $(2) and $(2), respectively(1)-(3)(2)Comprehensive Income$118$98$222$182 Net Income$119$98$225$184 Preferred Stock Dividends

--2 2 Net Income Available to Common Shareholder$119$98$223$182The accompanying notes as they relate to Ameren Illinois are an integral part of these financial statements.

11AMEREN ILLINOIS COMPANY (d/b/a AMEREN ILLINOIS)

BALANCE SHEET (Unaudited) (In millions)

September 30, 2016 December 31, 2015 ASSETS Current Assets:

Cash and cash equivalents$3$71 Accounts receivable - trade (less allowance for doubtful accounts of $12 and $12, respectively) 259 204 Accounts receivable - affiliates 13 22 Unbilled revenue 96 111 Miscellaneous accounts receivable 11 19 Materials and supplies 159 151 Current regulatory assets 59 167 Other current assets 17 15 Total current assets 617 760 Property and Plant, Net 7,285 6,848 Investments and Other Assets:

Goodwill 411 411 Regulatory assets 791 771 Other assets 98 113 Total investments and other assets 1,300 1,295 TOTAL ASSETS$9,202$8,903 LIABILITIES AND SHAREHOLDERS' EQUITY Current Liabilities:

Current maturities of long-term debt$-$129 Short-term debt 157-Borrowings from money pool 54-Accounts and wages payable 214 249 Accounts payable - affiliates 59 66 Taxes accrued 8 13 Interest accrued 40 28 Customer deposits 68 69 Mark-to-market derivative liabilities 21 45 Current environmental remediation 35 28 Current regulatory liabilities 56 39 Other current liabilities 99 86 Total current liabilities 811 752 Long-term Debt, Net 2,344 2,342 Deferred Credits and Other Liabilities:

Accumulated deferred income taxes, net 1,618 1,480 Accumulated deferred investment tax credits 2 2 Regulatory liabilities 761 732 Pension and other postretirement benefits 262 271 Environmental remediation 171 205 Other deferred credits and liabilities 212 222 Total deferred credits and other liabilities 3,026 2,912 Commitments and Contingencies (Notes 2, 8, and 9)

Shareholders' Equity:

Common stock, no par value, 45.0 shares authorized - 25.5 shares outstanding

--Other paid-in capital 2,005 2,005 Preferred stock 62 62 Retained earnings 952 825 Accumulated other comprehensive income 2 5 Total shareholders' equity 3,021 2,897 TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY$9,202$8,903The accompanying notes as they relate to Ameren Illinois are an integral part of these financial statements.

12AMEREN ILLINOIS COMPANY (d/b/a AMEREN ILLINOIS)STATEMENT OF CASH FLOWS (Unaudited) (In millions)

Nine Months Ended September 30,2016 2015 Cash Flows From Operating Activities:

Net income$225$184 Adjustments to reconcile net income to net cash provided by operating activities:

Depreciation and amortization 236 218 Amortization of debt issuance costs and premium/discounts 11 11 Deferred income taxes and investment tax credits, net 141 108 Other(8)(7)Changes in assets and liabilities:

Receivables(36)45 Materials and supplies(8)3 Accounts and wages payable(17)11 Taxes accrued 5(10)Regulatory assets and liabilities 75(31)Assets, other 11 6 Liabilities, other 6(10)Pension and other postretirement benefits(14)13 Net cash provided by operating activities 627 541 Cash Flows From Investing Activities:

Capital expenditures(683)(620)Other 4 5 Net cash used in investing activities(679)(615)Cash Flows From Financing Activities:

Dividends on common stock(95)-Dividends on preferred stock(2)(2)Short-term debt, net 157(32)Money pool borrowings, net 54 107 Maturities of long-term debt(129)-Other(1)-Net cash provided by (used in) financing activities(16)73 Net change in cash and cash equivalents(68)(1)Cash and cash equivalents at beginning of year 71 1 Cash and cash equivalents at end of period

$3$-The accompanying notes as they relate to Ameren Illinois are an integral part of these financial statements.

13AMEREN CORPORATION (Consolidated)UNION ELECTRIC COMPANY (d/b/a Ameren Missouri)

AMEREN ILLINOIS COMPANY (d/b/a Ameren Illinois)COMBINED NOTES TO FINANCIAL STATEMENTS (Unaudited)

September30, 2016 NOTE 1 -

SUMMARY

OF SIGNIFICANT ACCOUNTING

POLICIES General Ameren, headquartered in St. Louis, Missouri, is a public utility holding company under PUHCA 2005. Ameren's primary assets are its equity interests in its subsidiaries, including Ameren Missouri and Ameren Illinois. Ameren's subsidiaries are separate, independent legal entities with separate businesses, assets, and liabilities. Dividends on Ameren's common stock and the payment of expenses by Ameren depend on distributions made to it by its subsidiaries. Ameren's principal subsidiaries are listed below.

Also see the Glossary of Terms and Abbreviations at the front of

this report and in the Form 10-K.* Union Electric Company, doing business as Ameren Missouri, operates a rate-regulated electric generation, transmission, and distribution business and a rate-regulated

natural gas transmission and distribution business in

Missouri.

  • Ameren Illinois Company, doing business as Ameren Illinois, operates rate-regulated electric and natural gas transmission

and distribution businesses in Illinois. Additionally, Ameren has a subsidiary, ATXI, that operates a FERC rate-regulated electric transmission business. ATXI is

developing MISO-approved electric transmission projects, including the Illinois Rivers, Spoon River, and Mark Twain projects. Ameren is also pursuing projects to improve electric transmission system reliability within Ameren Missouri's and

Ameren Illinois' service territories as well as evaluating

competitive electric transmission investment opportunities outside

of these territories, including investments outside of MISO.

Ameren also has various other subsidiaries that conduct activities

such as the provision of shared services.Unless otherwise stated, these notes to Ameren's financial statements exclude discontinued operations for all periods

presented. See Note 12 - Discontinued Operations in this report and Note 16 - Divestiture Transactions and Discontinued

Operations under Part II, Item 8, of the Form 10-K for additional

information.Ameren's financial statements are prepared on a consolidated basis and therefore include the accounts of its majority-owned subsidiaries. All intercompany transactions have been eliminated. Ameren Missouri and Ameren Illinois have no

subsidiaries, and therefore their financial statements are not prepared on a consolidated basis. All tabular dollar amounts are

in millions, unless otherwise indicated.Our accounting policies conform to GAAP. Our financial statements reflect all adjustments (which include normal, recurring adjustments) that are necessary, in our opinion, for a fair statement of our results. The preparation of financial statements in conformity with GAAP requires management to

make certain estimates and assumptions. Such estimates and assumptions affect reported amounts of assets and liabilities, the

disclosure of contingent assets and liabilities at the dates of

financial statements, and the reported amounts of revenues and expenses during the reported periods. Actual results could differ from those estimates. The results of operations of an interim

period may not give a true indication of results that may be expected for a full year. These financial statements should be

read in conjunction with the financial statements and the notes

thereto included in the Form 10-K.

Asset Retirement ObligationsAROs at Ameren, Ameren Missouri, and Ameren Illinois increased during the nine months ended September 30, 2016, to reflect the accretion of the estimated obligation due to the passage of time, partially offset by immaterial settlements.

Share-based CompensationA summary of nonvested performance share units at September30, 2016, and changes during the nine months ended September 30, 2016, under the 2006 Incentive Plan and the 2014 Incentive Plan are presented below:

Performance Share Units Share Units Weighted-average Fair Value per Share Unit Nonvested at January 1, 20161,024,870$

46.08 Granted (a)587,197 44.13 Forfeitures(15,949)45.07Vested (b)(23,114)44.41 Nonvested at September 30, 20161,573,004$

45.39(a) Performance share units granted to certain executive and nonexecutive officers and other eligible employees under the 2014 Incentive Plan.(b) Performance share units vested due to the attainment of retirement eligibility by certain employees. Actual shares issued for retirement-eligible employees will vary depending on actual performance over the three-year measurement period.

14 The fair value of each performance share unit awarded in 2016 under the 2014 Incentive Plan was determined to be $44.13, which was based on Ameren's closing common share price of $43.23 at December31, 2015, and lattice simulations.

Lattice simulations are used to estimate expected share payout based on Ameren's total shareholder return for a three-year

performance period relative to the designated peer group beginning January1, 2016. The simulations can produce a

greater fair value for the performance share unit than the

December 31 applicable closing common share price because

they include the weighted payout scenarios in which an increase in the share price has occurred. The significant assumptions used to calculate fair value also included a three-year risk-free rate of 1.31%, volatility of 15% to 20% for the peer group, and Ameren's attainment of a three-year average earnings per share

threshold during the performance period. Excise TaxesAmeren Missouri and Ameren Illinois collect certain excise taxes from customers that are levied on the sale or distribution of natural gas and electricity. Excise taxes are levied on Ameren Missouri's electric and natural gas businesses and on Ameren Illinois' natural gas business and are recorded gross in

"Operating Revenues - Electric," "Operating Revenues - Gas" and "Operating Expenses - Taxes other than income taxes" on

the statement of income or the statement of income and

comprehensive income. Excise taxes for electric service in Illinois

are levied on the customer and are therefore not included in Ameren Illinois' revenues and expenses. The following table

presents excise taxes recorded in "Operating Revenues -

Electric," "Operating Revenues - Gas" and "Operating Expenses

- Taxes other than income taxes" for the three and nine months ended September 30, 2016 and 2015:

ThreeMonths Nine Months2016201520162015 Ameren Missouri$52$52$122$127 Ameren Illinois 9 9 40 42 Ameren$61$61$162$169 Earnings Per Share Basic earnings per share is computed by dividing "Net Income Attributable to Ameren Common Shareholders" by the

weighted-average number of common shares outstanding during

the period. Earnings per diluted share is computed by dividing "Net Income Attributable to Ameren Common Shareholders" by

the weighted-average number of diluted common shares

outstanding during the period. Earnings per diluted share reflects

the potential dilution that would occur if certain stock-based performance share units were settled. The number of performance share units assumed to be settled was 0.3 million and 0.4 million in the three and nine months ended September 30, 2016, respectively, and 1.3 million and 1.2 million, respectively, in the year-ago periods. There were no potentially

dilutive securities excluded from the earnings per diluted share calculations for the three and nine months ended September 30, 2016 and 2015. The calculation of diluted earnings per share prospectively reflected the adoption of FASB guidance related to employee share-based payment accounting discussed below.

Accounting and Reporting Developments Below is a summary of recently issued authoritative accounting standards relevant to the Ameren Companies.

Revenue from Contracts with CustomersIn May 2014, the FASB issued authoritative accounting guidance that changes the criteria for recognizing revenue from a contract with a customer. The underlying principle of the

guidance is that an entity will recognize revenue for the transfer

of promised goods or services to customers at an amount that

the entity expects to be entitled to in exchange for those goods or services. The guidance also requires additional disclosures to

enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows

arising from contracts with customers. Entities can apply the

guidance retrospectively to each reporting period presented or retrospectively by recording a cumulative effect adjustment to retained earnings in the period of initial adoption. The Ameren

Companies are currently assessing the impact of this guidance

on their results of operations, financial position, and disclosures, including their accounting for contributions in aid of construction

and similar arrangements, as well as the transition method that they will use to adopt the guidance. The guidance will be effective for the Ameren Companies in the first quarter of 2018. Amendments to the Consolidation AnalysisIn February 2015, the FASB issued authoritative accounting guidance that amends the consolidation analysis for variable interest entities and voting interest entities. The new guidance affects (1) limited partnerships, similar legal entities, and certain

investment funds, (2) the evaluation of fees paid to a decision

maker or service provider as a variable interest, (3) how fee

arrangements impact the primary beneficiary determination, and

(4) the evaluation of related party relationships on the primary beneficiary determination. The adoption of this guidance in the first quarter of 2016 did not impact the Ameren Companies' results of operations, financial position, liquidity, or disclosures.

LeasesIn February 2016, the FASB issued authoritative accounting guidance that will require an entity to recognize assets and liabilities arising from a lease. Consistent with current GAAP, the

recognition, measurement, and presentation of expenses and

cash flows arising from a lease will depend primarily on its classification as a finance or operating lease. The guidance also

requires additional disclosures to enable users of financial

statements to understand the amount, timing, and uncertainty of cash flows arising from leases. The guidance will be effective for the Ameren Companies in the first quarter of 2019, with an option for entities to adopt early. Upon adoption, the Ameren Companies

will recognize and measure operating leases on their respective

balance sheets at the beginning of the earliest period presented.

The Ameren Companies are currently assessing the impact of 15 this guidance on their results of operations, financial position, statement of cash flows, and disclosures. Improvements to Employee Share-Based Payment AccountingIn March 2016, the FASB issued authoritative accounting guidance that simplifies the accounting for share-based payment transactions, including the income tax consequences, the

calculation of diluted earnings per share, the treatment of

forfeitures, the classification of awards as either equity or

liabilities, and the classification on the statement of cash flows.

Ameren determines for each performance share unit award whether the difference between the deduction for tax purposes

and the compensation cost recognized for financial reporting

purposes results in either an excess tax benefit or an excess tax deficit. Previously, excess tax benefits were recognized in "Other paid-in capital" on Ameren's consolidated balance sheet, and in

certain cases, excess tax deficits were recognized in "Income taxes" on Ameren's consolidated income statement. The new

guidance increases income statement volatility by requiring all

excess tax benefits and deficits to be recognized in "Income

taxes," and treated as discrete items in the period in which they occur. Ameren adopted this guidance in the first quarter of 2016

and prospectively applied the amendment in this guidance

requiring recognition of excess tax benefits and deficits in the income statement, which resulted in recognition of a $21 million income tax benefit and a corresponding $21 million increase in income from continuing operations and net income (9 cents per diluted share) during that period. Also as a result of the adoption of this guidance, Ameren made an accounting policy election to continue to estimate the number of forfeitures expected to occur.

The amendments in the guidance that require application using a modified retrospective transition method did not impact Ameren.

Therefore, there was no cumulative-effect adjustment to retained earnings recognized as of January 1, 2016. Ameren applied the

amendments in this guidance relating to classification on the statement of cash flows retrospectively. As a result, for the nine months ended September 30, 2015, Ameren reclassified, for comparison purposes, $2 million of excess tax benefits on the statement of cash flows from financing to operating activity, and

$12 million of employee payroll taxes related to share-based payments from operating to financing activity. NOTE 2 - RATE AND REGULATORY MATTERS Below is a summary of updates to significant regulatory proceedings and related lawsuits. See also Note 2 - Rate and Regulatory Matters under Part II, Item8, of the Form 10-K. We

are unable to predict theultimate outcome of these matters, the

timing of the final decisions of the various agencies and courts, or

the impact on our results of operations, financial position, or liquidity.

Missouri 2016 Electric Rate CaseOn July1, 2016, Ameren Missouri filed a request with the MoPSC seeking approval to increase its annual revenues for electric service by $206 million. The electric rate increase request is based on a 9.9% return on equity, a capital structure comprised of 51.8% equity, a rate base of $7.2 billion, and a test year ended

March31, 2016, with certain pro-forma adjustments through the true-up date of December31, 2016. The rate request includes

$74 million that primarily relates to nearly $1.4 billion of new

gross electric infrastructure investments since the true-up date in Ameren Missouri's last electric rate case. This $74 million includes depreciation expenses of $39 million, return on rate base of $25 million, and increased property taxes of $10 million.

The rate request also includes $51 million related to reduced

customer sales volumes, including reductions from the suspended operations at the New Madrid Smelter, and $34 million related to increases in transmission charges. Other

changes in expenses reflected in the rate request include

decreases in pension and other post-employment benefit plan expenses of $24 million and solar rebate expenses of $15 million, both of which are subject to regulatory tracking mechanisms;

increased net energy costs, excluding the impact of the

suspended operations at the New Madrid Smelter and other customer sales volumes, of $23 million; and increased income taxes of $15 million. As a part of its filing, Ameren Missouri requested the amortization over ten years of an estimated $81 million of lost

fixed cost recovery due to lower sales volumes, as discussed below, from the New Madrid Smelter during the period April 2015

through May 2017. Ameren Missouri also requested continued use of its FAC and the regulatory tracking mechanisms for pension and

postretirement benefits and uncertain income tax positions that

the MoPSC previously authorized in earlier electric rate orders.

Additionally, Ameren Missouri requested the implementation of a

new regulatory tracking mechanism for transmission charges and revenues.

The MoPSC proceeding relating to the proposed electric service rate changes will take place over a period of up to 11 months, with a decision by the MoPSC expected by late April 2017 and new rates effective in late May 2017. Ameren Missouri

cannot predict the level of any electric service rate change the MoPSC may approve, when any rate change may go into effect, whether the requested regulatory tracking mechanisms will be

approved, or whether any rate increase that may eventually be approved will be sufficient for Ameren Missouri to recover its

costs and earn a reasonable return on its investments when the increase goes into effect.

Noranda and New Madrid Smelter In the first quarter of 2016, Noranda suspended operations at the New Madrid Smelter and filed voluntary petitions for a court-supervised restructuring process under Chapter 11 of the

United States Bankruptcy Code. In October 2016, Noranda sold the New Madrid Smelter to ARG International AG. As of September30, 2016, Ameren Missouri has been paid in full for all

previous electric service amounts, and expects to continue to be

paid in full for the minimal amount of electric service it is currently providing to the New Madrid Smelter.

16In its April 2015 electric rate order, the MoPSC approved a rate design that established $78 million in annual revenues, net of fuel and purchased power costs, as the New Madrid Smelter's portion of Ameren Missouri's revenue requirement. In 2016, as a

result of the suspended operations, actual sales volumes to the

New Madrid Smelter are significantly below the sales volumes reflected in rates. As a result, full recovery by Ameren Missouri of

its revenue requirement has not occurred and will not occur until

rates are adjusted prospectively by the MoPSC in the July 2016

electric rate case to accurately reflect the actual sales volumes to the New Madrid Smelter. In its July 2016 electric rate case, Ameren Missouri is seeking to recover the April 2015 through

May 2017 lost fixed costs caused by the lower sales volumes to New Madrid Smelter. Also, as a result of the New Madrid Smelter's suspended operations, Ameren Missouri is applying a provision in its FAC tariff that, under certain circumstances, allows Ameren Missouri to retain a portion of the revenues from any off-system sales it makes as a result of reduced sales to the smelter. The current market price of electricity is less than the New Madrid Smelter's electric rate, and Ameren Missouri expects market prices to remain below the New Madrid Smelter's electric

rate through the date that new rates in the July 2016 rate case become effective. Accordingly, this FAC-tariff provision will not enable Ameren Missouri to fully recover its revenue requirement

under current market conditions. Operations at the New Madrid Smelter remain suspended and Ameren Missouri is uncertain of future sales to the smelter.MEEIA 2013 The MEEIA 2013 performance incentive allowed Ameren Missouri an opportunity to earn additional revenues by achieving certain customer energy efficiency goals, including $19 million if 100% of the goals were achieved during the three-year period, with the potential to earn a larger performance incentive if Ameren Missouri's energy savings exceeded those goals. In September 2016, Ameren Missouri and the MoPSC staff filed a stipulation agreement with the MoPSC that supported a $29 million MEEIA 2013 performance incentive. The MoOPC opposed this stipulation agreement; however, it did not oppose the conclusion that Ameren Missouri achieved at least 100% of the customer energy efficiency goals. As there was no challenge to the achievement of at least 100% of the customer energy efficiency goals, Ameren Missouri recognized $19 million of revenue during the third quarter of 2016 related to the MEEIA 2013 performance incentive. In November 2016, the MoPSC approved a $28 million MEEIA 2013 performance incentive based on a revised stipulation agreement between Ameren Missouri, the MoPSC staff, and the MoOPC. As a result, Ameren Missouri will

recognize $9 million of additional revenues in the fourth quarter of 2016 relating to the MEEIA 2013 performance incentive. Further, the revised stipulation agreement included a provision to incorporate the results of the appeal, discussed below, regarding

the determination of an input used to calculate the performance incentive.

In November 2015, the MoPSC issued an order regarding the determination of an input used to calculate the performance incentive. Ameren Missouri filed an appeal of the order with the Missouri Court of Appeals, Western District, which is expected to issue a decision in 2016. If the Missouri Court of Appeals, Western District, overturns the November 2015 MoPSC order, Ameren Missouri may recognize additional revenues in excess of the $28 million approved by the MoPSC in November 2016. ATXI's Mark Twain Project The Mark Twain project is a MISO-approved 95-mile transmission line to be located in northeast Missouri. In April 2016, the MoPSC granted ATXI a certificate of convenience and necessity for the Mark Twain project. Before starting construction, ATXI must obtain assents for road crossings from the five

counties where the line will be constructed. None of the five county commissions approved ATXI's requests for the assents. In October 2016, ATXI filed suit in each of the five county circuit courts to obtain the assents. A decision from each of the county circuit courts is expected in 2017. ATXI plans to complete the project in 2018; however, delays in obtaining the assents could delay the completion date.

Illinois IEIMA Under the provisions of the IEIMA's performance-based formula rate-making framework, which currently extends through 2019, Ameren Illinois' electric distribution service rates are

subject to an annual revenue requirement reconciliation to its actual recoverable costs. Throughout each year, Ameren Illinois

records a regulatory asset or a regulatory liability and a

corresponding increase or decrease to operating revenues for any differences between the revenue requirement reflected in

customer rates for that year and its estimate of the probable

increase or decrease in the revenue requirement expected to

ultimately be approved by the ICC based on that year's actual recoverable costs incurred. As of September30, 2016, Ameren Illinois had recorded regulatory assets of $23 million, $66 million, and $22 million to reflect its expected 2016 and 2015 revenue

requirement reconciliation adjustments, and the approved 2014

revenue requirement reconciliation adjustment, with interest, respectively. In April 2016, Ameren Illinois filed with the ICC its annual electric distribution service formula rate update to establish the

revenue requirement used for 2017 rates. Pending ICC approval, Ameren Illinois' update filing will result in a $14 million decrease in Ameren Illinois' electric distribution service revenue requirement, beginning in January 2017. This update reflects an

increase to the annual formula rate based on 2015 actual costs

and expected net plant additions for 2016, an increase to include

the 2015 revenue requirement reconciliation adjustment, and a

decrease for the conclusion of the 2014 revenue requirement

reconciliation adjustment, which will be fully collected from customers in 2016, consistent with the ICC's December 2015 annual update filing order. As of December 31, 2015, Ameren Illinois had recorded a regulatory asset of $103 million related to

the approved 2014 revenue requirement reconciliation adjustment. In October 2016, an administrative law judge issued a proposed order that reflected a decrease to Ameren Illinois' 17 electric distribution service revenue requirement of $14 million.

An ICC decision on the revenue requirement used for 2017 rates

is expected by December 2016.

Federal FERC Complaint Cases In November 2013, a customer group filed a complaint case with the FERC seeking a reduction in the allowed base return on common equity for the FERC-regulated transmission rate base under the MISO tariff from 12.38% to 9.15%. In September 2016, the FERC issued a final order in the November 2013 complaint

case which lowered the allowed base return on common equity to 10.32%. The order was consistent with the initial decision an

administrative law judge issued in December 2015 and requires

customer refunds, with interest, to be issued for the 15-month

period ended February 2015. In addition, the new allowed base

return on common equity is reflected in rates prospectively from the September 2016 effective date of the order. Refunds for the

November 2013 complaint case are expected to be issued in the

first half of 2017.

After the maximum FERC-allowed refund period for the November 2013 complaint case ended in February 2015, another customer complaint case was filed in February 2015. The

February 2015 complaint case seeks a reduction in the allowed

base return on common equity for the FERC-regulated transmission rate base under the MISO tariff to 8.67%. In June

2016, an administrative law judge issued an initial decision in the

February 2015 complaint case which would lower the allowed base return on common equity to 9.70% and would require

customer refunds, with interest, to be issued for the 15-month period ended May 2016. The FERC is expected to issue a final

order in the February 2015 complaint case in the second quarter of 2017. The final order in the February 2015 complaint case will

determine the allowed base return on common equity for the 15-month period ended May 2016. The final order in the February

2015 complaint case will also establish the allowed base return

on common equity that will apply prospectively from its expected second quarter 2017 effective date, replacing the 10.32% allowed base return on common equity, which became effective in September 2016. The 12.38% allowed base return on common equity was effective for the period that began at the conclusion of

the 15-month period for the February 2015 complaint case in May 2016 through the September 2016 effective date of the final order

in the November 2013 complaint case.

On January 6, 2015, a FERC-approved incentive adder of up to 50 basis points on the allowed base return on common equity for our participation in an RTO became effective.

Beginning with its January 6, 2015 effective date, the incentive

adder reduces any refund to customers relating to a reduction of

the allowed base return on common equity from the complaint

cases discussed above and will also be applied prospectively from the effective date of the September 2016 FERC order, resulting in a current allowed return on common equity of

10.82%. As of September30, 2016, Ameren and Ameren Illinois recorded current regulatory liabilities of $61 million and $42 million, respectively, to reflect the expected refunds, including

interest, associated with the reduced allowed base returns on

common equity in the September 2016 FERC order and the initial decision in the February 2015 complaint case. Ameren Missouri did not record a liability as of September30, 2016, as it does not

expect that a reduction in the FERC-allowed base return on

common equity for MISO transmission owners would be material to its results of operations, financial position, or liquidity.

Combined Construction and Operating License In 2008, Ameren Missouri filed an application with the NRC for a COL for a second nuclear unit at Ameren Missouri's existing Callaway County, Missouri, energy center site. In 2009, Ameren Missouri suspended its efforts to build a second nuclear unit at its

existing Callaway site, and the NRC suspended review of the COL application. Prior to suspending its efforts, Ameren Missouri had capitalized $69 million related to the project. Primarily because of changes in vendor support for licensing efforts at the NRC, Ameren Missouri's assessment of long-term capacity

needs, declining costs of alternative generation technologies, and the regulatory framework in Missouri, Ameren Missouri discontinued its efforts to license and build a second nuclear unit at its existing Callaway site. As a result of this decision, in the second quarter of 2015, Ameren and Ameren Missouri recognized a $69 million noncash pretax provision for all of the previously capitalized COL costs. Ameren Missouri has withdrawn its COL application with the NRC.NOTE 3 - SHORT-TERM DEBT AND LIQUIDITYThe liquidity needs of the Ameren Companies are typically supported through the use of available cash, drawings under committed credit agreements, commercial paper issuances, or, in the case of Ameren Missouri and Ameren Illinois, short-term intercompany borrowings.The Missouri Credit Agreement and the Illinois Credit Agreement, both of which expire on December 11, 2019, were not utilized for direct borrowings during the nine months ended September 30, 2016, but were used to support commercial paper issuances and to issue letters of credit. Based on commercial paper outstanding, as well as letters of credit issued under the Credit Agreements, the aggregate amount of credit capacity available under the Credit Agreements to Ameren (parent), Ameren Missouri, and Ameren Illinois, collectively, at September30, 2016, was $1.5 billion.

18 Commercial PaperThe following table presents commercial paper outstanding as of September30, 2016, and December31, 2015:

2016 2015 Ameren (parent)

$451$301 Ameren Missouri

--Ameren Illinois 157-Ameren Consolidated

$608$301The following table summarizes the borrowing activity and relevant interest rates under Ameren's (parent), Ameren Missouri's, and Ameren Illinois' commercial paper programs for the nine months ended September 30, 2016 and 2015:

Ameren (parent)Ameren Missouri Ameren Illinois Ameren Consolidated 2016 Average daily commercial paper outstanding$435$80$48$563 Weighted-average interest rate0.81%0.74%0.72%0.79%Peak commercial paper during period (a)$574$208$195$839 Peak interest rate0.95%0.85%0.85%0.95%2015 Average daily commercial paper outstanding$770$56$6$832 Weighted-average interest rate0.56%0.50%0.44%0.56%Peak commercial paper during period (a)$874$294$48$1,108 Peak interest rate0.70%0.60%0.60%0.70%(a) The timing of peak commercial paper issuances varies by company; therefore, the peak amounts presented by company might not equal the Ameren Consolidated peak commercial paper issuances for the period.

Indebtedness Provisions and Other CovenantsThe information below is a summary of the Ameren Companies' compliance with financial covenants in the Credit

Agreements. See Note 4 - Short-term Debt and Liquidity under

Part II, Item 8, in the Form 10-K for a detailed description of these provisions. The Credit Agreements also contain nonfinancial

covenants, including restrictions on the ability to incur liens, to transact with affiliates, to dispose of assets, to make investments in or transfer assets to its affiliates, and to merge with other

entities.The Credit Agreements require Ameren, Ameren Missouri, and Ameren Illinois to each maintain consolidated indebtedness of not more than 65% of its consolidated total capitalization pursuant to a defined calculation set forth in the agreements. As of September30, 2016, the ratios of consolidated indebtedness

to consolidated total capitalization, calculated in accordance with the provisions of the Credit Agreements, were 51%, 48%, and 46% for Ameren, Ameren Missouri, and Ameren Illinois, respectively. In addition, under the Credit Agreements, if Ameren

does not have a senior long-term unsecured credit rating of at least Baa3 from Moody's or BBB- from S&P, Ameren is required

to maintain a ratio of consolidated funds from operations plus

interest expense to consolidated interest expense of at least 2.0 to 1.0. As of September30, 2016, Ameren's senior long-term

unsecured credit rating exceeded the minimum rating

requirements; therefore, the interest coverage requirement was

not applicable. Failure of a borrower to satisfy a financial

covenant constitutes an immediate default under the applicable Credit Agreement.The Credit Agreements contain default provisions that apply separately to each borrower; provided, however, that a default of Ameren Missouri or Ameren Illinois under the applicable Credit Agreement will also be deemed to constitute a default of Ameren

under such agreement. Defaults include a cross-default resulting

from a default of such borrower under any other agreement

covering outstanding indebtedness of such borrower and certain

subsidiaries (other than project finance subsidiaries and nonmaterial subsidiaries) in excess of $75 million in the aggregate (including under the other Credit Agreement).

However, under the default provisions of the Credit Agreements, any default of Ameren under any Credit Agreement that results solely from a default of Ameren Missouri or Ameren Illinois thereunder does not result in a cross-default of Ameren under the other Credit Agreement. Further, the Credit Agreement default provisions provide that an Ameren default under any of the Credit Agreements does not constitute a default by Ameren Missouri or

Ameren Illinois. None of the Ameren Companies' credit agreements or financing arrangements contain credit rating triggers that would

cause a default or acceleration of repayment of outstanding balances. The Ameren Companies were in compliance with the covenants in their credit agreements at September30, 2016

.

19 Money Pools Ameren has money pool agreements with and among its subsidiaries to coordinate and provide for certain short-term cash and working capital requirements.Ameren Missouri, Ameren Illinois, and ATXI may participate in the utility money pool as both lenders and borrowers. Ameren (parent) and Ameren Services may participate in the utility money

pool only as lenders. Surplus internal funds are contributed to the utility money pool from participants. The primary sources of

external funds for the utility money pool are the Credit Agreements and the commercial paper programs. The total

amount available to the money pool participants from the utility

money pool at any given time is reduced by the amount of

borrowings made by participants, but is increased to the extent

that the money pool participants advance surplus funds to the utility money pool or remit funds from other external sources. The

availability of funds is also determined by funding requirement

limits established by regulatory authorizations. Participants

receiving a loan under the utility money pool must repay the principal amount of such loan, together with accrued interest. The

rate of interest depends on the composition of internal and external funds in the utility money pool. The average interest rate for borrowing under the utility money pool for the three and nine months ended September 30, 2016, was 0.53% and 0.54%,

respectively (2015 - 0.10% and 0.09%, respectively). See Note 8 - Related Party Transactions for the amount of interest income and expense from the money pool arrangements recorded by the Ameren Companies for the nine months ended September 30, 2016 and 2015.NOTE 4 - LONG-TERM DEBT AND EQUITY FINANCINGS Ameren MissouriIn February 2016, Ameren Missouri's $260 million of 5.40% senior secured notes matured and were repaid with cash on hand and commercial paper borrowings. In June 2016, Ameren Missouri issued $150 million of 3.65% senior secured notes due April 15, 2045, with interest payable semiannually on April 15 and October 15 of each year, beginning October 15, 2016. Ameren Missouri received proceeds of $148 million, which were used to repay commercial paper borrowings.

Ameren IllinoisIn June 2016, Ameren Illinois' $54 million of 6.20% senior secured notes and $75 million of 6.25% senior secured notes matured and were repaid with commercial paper borrowings.

Indenture Provisions and Other CovenantsAmeren Missouri's and Ameren Illinois' indentures, credit facilities, and articles of incorporation include covenants and provisions related to issuances of first mortgage bonds and preferred stock. Ameren Missouri and Ameren Illinois are required to meet certain ratios to issue additional first mortgage bonds and preferred stock. A failure to achieve these ratios would not result in a default under these covenants and provisions, but would restrict the companies' ability to issue first mortgage bonds or preferred stock. The following table summarizes the

required and actual interest coverage ratios for interest charges, dividend coverage ratios, and first mortgage bonds and preferred stock issuable as of September30, 2016, at an assumed annual interest rate of 5% and dividend rate of 6%:

RequiredInterest Coverage Ratio (a)Actual InterestCoverageRatioBondsIssuable (b)RequiredDividend Coverage Ratio (c)ActualDividend Coverage Ratio PreferredStock Issuable Ameren Missouri4.7$3,838105.9$2,357 Ameren Illinois 7.3 3,942 (d)3.0 203 (e)(a) Coverage required on the annual interest charges on first mortgage bonds outstanding and to be issued. Coverage is not required in certain cases when additional first mortgage bonds are issued on the basis of retired bonds.(b) Amount of first mortgage bonds issuable based either on required coverage ratios or unfunded property additions, whichever is more restrictive. The amounts shown also include first mortgage bonds issuable based on retired bond capacity of $1,206 million and $279 million at Ameren Missouri and Ameren Illinois, respectively.(c) Coverage required on the annual dividend on preferred stock outstanding and to be issued, as required in the respective company's articles of incorporation.(d) Amount of first mortgage bonds issuable by Ameren Illinois based on unfunded property additions and retired bonds solely under the former IP mortgage indenture. The amount of first mortgage bonds issuable by Ameren Illinois is also subject to the lien restrictions contained in the Illinois Credit Agreement. (e) Preferred stock issuable is restricted by the amount of preferred stock that is currently authorized by Ameren Illinois' articles of incorporation. Ameren's indenture does not require Ameren to comply with any quantitative financial covenants. The indenture does, however, include certain cross-default provisions. Specifically, either (1) the failure by Ameren to pay when due and upon

expiration of any applicable grace period any portion of any Ameren indebtedness in excess of $25 million or (2) the acceleration upon default of the maturity of any Ameren indebtedness in excess of $25 million under any indebtedness agreement, including borrowings under the Credit Agreements or the Ameren commercial paper program, constitutes a default

under the indenture, unless such past due or accelerated debt is

discharged or the acceleration is rescinded or annulled within a 20 specified period. Ameren Missouri and Ameren Illinois and certain other Ameren subsidiaries are subject to Section305(a) of the Federal Power Act, which makes it unlawful for any officer or director of a public utility, as defined in the Federal Power Act, to participate in

the making or paying of any dividend from any funds "properly included in capital account." The FERC has consistently

interpreted the provision to allow dividends to be paid as long as

(1) the source of the dividends is clearly disclosed, (2) the

dividends are not excessive, and (3) there is no self-dealing on the part of corporate officials. At a minimum, Ameren believes

that dividends can be paid by its subsidiaries that are public utilities from retained earnings. In addition, under Illinois law, Ameren Illinois may not pay any dividend on its stock unless, among other things, its earnings and earned surplus are sufficient

to declare and pay a dividend after provision is made for reasonable and proper reserves, or unless Ameren Illinois has

specific authorization from the ICC.Ameren Illinois' articles of incorporation require dividend payments on its common stock to be based on ratios of common

stock to total capitalization and other provisions related to certain

operating expenses and accumulations of earned surplus.

Ameren Illinois committed to the FERC to maintain a minimum of 30% equity in its capital structure. As of September30, 2016, Ameren Illinois had 51% equity in its capital structure.In order for the Ameren Companies to issue securities in the future, we have to comply with all applicable requirements in effect at the time of any such issuances.Off-Balance-Sheet ArrangementsAt September30, 2016, none of the Ameren Companies had off-balance-sheet financing arrangements, other than operating leases entered into in the ordinary course of business, letters of credit, and Ameren parent guarantee arrangements on behalf of its subsidiaries. None of the Ameren Companies expect to engage in any significant off-balance-sheet financing

arrangements in the near future.NOTE 5 - OTHER INCOME AND EXPENSESThe following table presents the components of "Other Income and Expenses" in the Ameren Companies' statements of income for the three and nine months ended September 30, 2016 and 2015:

Three Months Nine Months2016201520162015 Ameren: (a)Miscellaneous income:

Allowance for equity funds used during construction$7$8$20$19 Interest income on industrial development revenue bonds 7 7 20 20 Interest income 3 4 11 12 Other 1-3 3 Total miscellaneous income

$18$19$54$54 Miscellaneous expense:

Donations$1$-$8$10 Other 7 5 13 12 Total miscellaneous expense$8$5$21$22 Ameren Missouri:

Miscellaneous income:

Allowance for equity funds used during construction$6$7$16$16 Interest income on industrial development revenue bonds 7 7 20 20 Interest income 1-1 1 Other--1-Total miscellaneous income

$14$14$38$37 Miscellaneous expense:

Donations$-$-$2$3 Other 2 3 4 5 Total miscellaneous expense$2$3$6$8 21 Three Months Nine Months2016201520162015 Ameren Illinois:

Miscellaneous income:

Allowance for equity funds used during construction$1$1$4$3 Interest income 2 3 9 10 Other 1-2 2 Total miscellaneous income$4$4$15$15 Miscellaneous expense:

Donations$1$-$6$4 Other 2 3 5 6 Total miscellaneous expense$3$3$11$10(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.NOTE 6 - DERIVATIVE FINANCIAL INSTRUMENTSWe use derivatives to manage the risk of changes in market prices for natural gas, power, and uranium, as well as the risk of changes in rail transportation surcharges through fuel oil hedges.

Such price fluctuations may cause the following:* an unrealized appreciation or depreciation of our contracted commitments to purchase or sell when purchase or sale

prices under the commitments are compared with current

commodity prices;* market values of natural gas and uranium inventories that differ from the cost of those commodities in inventory; and* actual cash outlays for the purchase of these commodities that differ from anticipated cash outlays.

The derivatives that we use to hedge these risks are governed by our risk management policies for forward contracts, futures, options, and swaps. Our net positions are continually

assessed within our structured hedging programs to determine whether new or offsetting transactions are required. The goal of

the hedging program is generally to mitigate financial risks while ensuring that sufficient volumes are available to meet our

requirements. Contracts we enter into as part of our risk management program may be settled financially, settled by physical delivery, or net settled with the counterparty.

The following table presents open gross commodity contract volumes by commodity type for derivative assets and liabilities as of September30, 2016, and December31, 2015. As of September30, 2016, these contracts extended through October 2018, March 2021, May 2032, and February 2020 for fuel oils, natural gas, power, and uranium, respectively.

Quantity (in millions, except as indicated) 2016 2015 Commodity Ameren Missouri AmerenIllinoisAmeren Ameren Missouri AmerenIllinoisAmeren Fuel oils (in gallons)(a)25 (b)25 35 (b)35 Natural gas (in mmbtu)2612815430151181 Power (in megawatthours) 1 9 10 1 10 11 Uranium (pounds in thousands) 445(b)445 494 (b)494(a) Consists of ultra-low-sulfur diesel products.(b) Not applicable.

Authoritative accounting guidance regarding derivative instruments requires that all contracts considered to be derivative instruments be recorded on the balance sheet at their fair values, unless the NPNS exception applies. See Note 7 - Fair Value

Measurements for a discussion of our methods of assessing the

fair value of derivative instruments. Many of our physical

contracts, such as our purchased power contracts, qualify for the NPNS exception to derivative accounting rules. The revenue or

expense on NPNS contracts is recognized at the contract price upon physical delivery.

If we determine that a contract meets the definition of a derivative and is not eligible for the NPNS exception, we review

the contract to determine whether the resulting gains or losses

qualify for regulatory deferral. Derivative contracts that qualify for regulatory deferral are recorded at fair value, with changes in fair

value recorded as regulatory assets or liabilities in the period in which the change occurs. We believe derivative losses and gains

deferred as regulatory assets and liabilities are probable of recovery, or refund, through future rates charged to customers.

Regulatory assets and liabilities are amortized to operating

income as related losses and gains are reflected in rates charged to customers. Therefore, gains and losses on these derivatives have no effect on operating income. As of September30, 2016, and December31, 2015, all contracts that met the definition of a

derivative and are not eligible for the NPNS exception received

regulatory deferral.

Authoritative accounting guidance permits companies to offset fair value amounts recognized for the right to reclaim cash 22 collateral (a receivable) or the obligation to return cash collateral (a liability) against fair value amounts recognized for derivative

instruments that are executed with the same counterparty under a master netting arrangement or similar agreement. The Ameren Companies did not elect to adopt this guidance for any eligible

derivative instruments.

The following table presents the carrying value and balance sheet location of all derivative commodity contracts, none of which were designated as hedging instruments, as of September30, 2016, and December31, 2015:

Balance Sheet Location Ameren Missouri Ameren Illinois Ameren 2016 Fuel oils Other assets

$1$-$1 Natural gas Other current assets

-2 2 Other assets

-1 1 Power Other current assets 11-11Total assets (a)$12$3$15 Fuel oils Other current liabilities

$8$-$8 Other deferred credits and liabilities 1-1 Natural gas MTM derivative liabilities (b)9 (b)Other current liabilities 3-12 Other deferred credits and liabilities 6 9 15 Power MTM derivative liabilities (b)12 (b)Other current liabilities 2-14 Other deferred credits and liabilities

-160 160 Uranium Other current liabilities 2-2 Other deferred credits and liabilities 3-3Total liabilities (c)$25$190$215 2015 Natural gas Other current assets

$-$1$1 Other assets 1-1 Power Other current assets 16-16Total assets (a)$17$1$18 Fuel oils Other current liabilities

$22$-$22 Other deferred credits and liabilities 7-7 Natural gas MTM derivative liabilities (b)32 (b)Other current liabilities 6-38 Other deferred credits and liabilities 8 18 26 Power MTM derivative liabilities (b)13 (b)Other current liabilities

--13 Other deferred credits and liabilities

-157 157 Uranium Other current liabilities 1-1Total liabilities (c)$44$220$264(a) The cumulative amount of pretax net gains on all derivative instruments is deferred as a regulatory liability.(b) Balance sheet line item not applicable to registrant.

(c) The cumulative amount of pretax net losses on all derivative instruments is deferred as a regulatory asset.

Derivative instruments are subject to various credit-related losses in the event of nonperformance by counterparties to the transaction.

Exchange-traded contracts are supported by the financial and credit quality of the clearing members of the respective exchanges and have nominal credit risk. In all other transactions, we are exposed to credit risk. Our credit risk management program involves establishing credit

limits and collateral requirements for counterparties, using master netting arrangements or similar agreements, and reporting daily exposure

to senior management.We believe that entering into master netting arrangements or similar agreements mitigates the level of financial loss that could result from default by allowing net settlement of derivative assets and liabilities. These master netting arrangements allow the counterparties to net settle sale and purchase transactions. Further, collateral requirements are calculated at the master netting arrangement or similar agreement level by counterparty.

23 The following table provides the recognized gross derivative balances and the net amounts of those derivatives subject to an enforceable master netting arrangement or similar agreement as of September30, 2016, and December31, 2015:

Gross Amounts Not Offset in the Balance Sheet Commodity Contracts Eligible to be Offset Gross Amounts Recognized in the Balance Sheet Derivative Instruments Cash Collateral Received/Posted (a)Net Amount 2016 Assets:

Ameren Missouri

$12$2$-$10 Ameren Illinois 3 2-1 Ameren$15$4$-$11 Liabilities:

Ameren Missouri

$25$2$5$18 Ameren Illinois 190 2-188 Ameren$215$4$5$206 2015 Assets:

Ameren Missouri

$17$1$-$16 Ameren Illinois 1--1 Ameren$18$1$-$17 Liabilities:

Ameren Missouri

$44$1$8$35 Ameren Illinois 220-3 217 Ameren$264$1$11$252(a) Cash collateral received reduces gross asset balances and is included in "Other current liabilities" and "Other deferred credits and liabilities" on the balance sheet. Cash collateral posted reduces gross liability balances and is included in "Other current assets" and "Other assets" on the balance sheet.

Concentrations of Credit Risk In determining our concentrations of credit risk related to derivative instruments, we review our individual counterparties and categorize each counterparty into groupings according to the primary business in which each engages. We calculate maximum exposures based on the gross fair value of financial instruments, including NPNS and other accrual contracts. These exposures are calculated on a gross basis, which include affiliate exposure not eliminated at the consolidated Ameren level. The potential loss on counterparty exposures may be reduced or eliminated by the application of master netting arrangements or similar agreements and collateral held. As of September30, 2016, if counterparty groups were to fail completely to perform on contracts, the Ameren Companies' maximum exposure would have been

immaterial with or without consideration of the application of master netting arrangements or similar agreements and collateral held.

Derivative Instruments with Credit Risk-Related Contingent FeaturesOur commodity contracts contain collateral provisions tied to the Ameren Companies' credit ratings. If our credit ratings were downgraded, or if a counterparty with reasonable grounds for uncertainty regarding our ability to satisfy an obligation requested adequate assurance of performance, additional collateral postings might be required. The following table presents, as of September30, 2016, the

aggregate fair value of all derivative instruments with credit risk-related contingent features in a gross liability position, the cash collateral posted, and the aggregate amount of additional collateral that counterparties could require. The additional collateral required is the net

liability position allowed under the master netting arrangements or similar agreements, assuming (1) the credit risk-related contingent features underlying these arrangements were triggered on September30, 2016, and (2) those counterparties with rights to do so requested

collateral.AggregateFairValueof Derivative Liabilities (a)Cash CollateralPosted PotentialAggregateAmountof AdditionalCollateralRequired (b)2016 Ameren Missouri

$69$2$60 Ameren Illinois 53-46 Ameren$122$2$106(a) Before consideration of master netting arrangements or similar agreements and including NPNS and other accrual contract exposures.(b) As collateral requirements with certain counterparties are based on master netting arrangements or similar agreements, the aggregate amount of additional collateral required to be posted is determined after consideration of the effects of such arrangements.

24NOTE 7 - FAIR VALUE MEASUREMENTS Fair value is defined as the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in

an orderly transaction between market participants on the measurement date. We use various methods to determine fair

value, including market, income, and cost approaches. With

these approaches, we adopt certain assumptions that market participants would use in pricing the asset or liability, including

assumptions about market risk or the risks inherent in the inputs

to the valuation. Inputs to valuation can be readily observable, market-corroborated, or unobservable. We use valuation

techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. Authoritative accounting

guidance established a fair value hierarchy that prioritizes the

inputs used to measure fair value.

All financial assets and liabilities carried at fair value are classified and disclosed in one of three hierarchy levels. See Note 8 - Fair Value Measurements under Part II, Item 8, of the Form 10-K for information related to hierarchy levels. We perform

an analysis each quarter to determine the appropriate hierarchy

level of the assets and liabilities subject to fair value

measurements. Financial assets and liabilities are classified in

their entirety according to the lowest level of input that is significant to the fair value measurement. All assets and liabilities

whose fair value measurement is based on significant

unobservable inputs are classified as Level 3.The following table describes the valuation techniques and unobservable inputs utilized by the Ameren Companies for the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy for the periods ended September30, 2016, and December31, 2015: Fair Value Weighted AverageAssetsLiabilitiesValuation Technique(s)

Unobservable Input Range Level 3 Derivative asset and liability

- commodity contracts (a): 2016 Fuel oils$1$-Option modelVolatilities(%)(b)25 - 38 26Discounted cash flowCounterparty credit risk(%)(c)(d)0.22 (e)Ameren Missouri credit risk(%)(c)(d)0.38 (d)Power (f)11(174)Discounted cash flowAverage forward peak and off-peak pricing forwards/swaps ($/MWh)(g)25 - 42 29 Estimated auction price for FTRs ($/MW)(b)(253) - 3,59331 Nodal basis ($/MWh)(g)(6) - 0 (2)Ameren credit risk (%)(c)(d)0.38 (e)Fundamental energy production model Estimated future gas prices ($/mmbtu)(b)3 - 5 4 Escalation rate (%)(b)(h)4 (e)Contract price allocationEstimated renewable energy credit costs ($/credit)(b)5 - 7 6 Uranium-(5)Option modelVolatilities (%)(b)20 (e)Discounted cash flowAverage forward uranium pricing ($/pound)(b)22 - 26 24 Ameren Missouri credit risk (%)(c)(d)0.38 (e) 25 Fair Value Weighted AverageAssetsLiabilitiesValuation Technique(s)

Unobservable Input Range 2015Natural gas$1$(1)Option modelVolatilities (%)(b)35 - 55 45 Nodal basis ($/mmbtu)(c)(0.30) - 0(0.20)Discounted cash flowNodal basis ($/mmbtu)(b)(0.10) - 0(0.10)

Counterparty credit risk (%)(c)(d)0.40 - 12 7 Ameren Missouri credit risk (%)(c)(d)0.40 (e)Power (f)16(170)Discounted cash flowAverage forward peak and off-peak pricing -

forwards/swaps ($/MWh)(g)22 - 39 29 Estimated auction price for FTRs ($/MW)(b)(270) - 2,057211 Nodal basis ($/MWh)(g)(10) - (1)(3)

Counterparty credit risk (%)(c)(d)0.86 (e)Ameren Illinois credit risk (%)(c)(d)0.40 (e)Fundamental energy production model Estimated future gas prices ($/mmbtu)(b)3 - 4 4 Escalation rate (%)(b)(h)3 (e)Contract price allocationEstimated renewable energy credit costs ($/credit)(b)5 - 7 6 Uranium-(1)Option modelVolatilities (%)(b)20 (e)Discounted cash flowAverage forward uranium pricing ($/pound)(b)35 - 42 37 Ameren Missouri credit risk (%)(c)(d)0.40 (e)(a) The derivative asset and liability balances are presented net of counterparty credit considerations.(b) Generally, significant increases (decreases) in this input in isolation would result in a significantly higher (lower) fair value measurement.

(c) Generally, significant increases (decreases) in this input in isolation would result in a significantly lower (higher) fair value measurement.

(d) Counterparty credit risk is applied only to counterparties with derivative asset balances. Ameren Missouri and Ameren Illinois credit risk is applied only to counterparties with derivative liability balances.(e) Not applicable.

(f) Power valuations use visible third-party pricing evaluated by month for peak and off-peak demand through 2020. Valuations beyond 2020 use fundamentally modeled pricing by month for peak and off-peak demand.(g) The balance at Ameren is comprised of Ameren Missouri and Ameren Illinois power contracts, which respond differently to unobservable input changes due to their opposing positions. (h) Escalation rate applies to power prices in 2031 and beyond for September 30, 2016, and to power prices in 2026 and beyond for December 31, 2015.

In accordance with applicable authoritative accounting guidance, we consider nonperformance risk in our valuation of derivative instruments by analyzing the credit standing of our counterparties and considering any counterparty credit enhancements (e.g., collateral).

The guidance also requires that the fair value measurement of liabilities reflect the nonperformance risk of the reporting entity , as applicable.

Therefore, we have factored the impact of our credit standing, as well as any potential credit enhancements, into the fair value measurement

of both derivative assets and derivative liabilities. Included in our valuation, and based on current market conditions, is a valuation adjustment

for counterparty default derived from market data such as the price of credit default swaps, bond yields, and credit ratings. No gains or losses related to valuation adjustments for counterparty default risk were recorded at Ameren, Ameren Missouri, or Ameren Illinois in the first nine months of 2016 or 2015. At September30, 2016, and December31, 2015, the counterparty default risk valuation adjustment related to derivative contracts was immaterial for Ameren, Ameren Missouri, and Ameren Illinois.

26The following table sets forth, by level within the fair value hierarchy, our assets and liabilities measured at fair value on a recurring basis as of September30, 2016:

QuotedPricesin ActiveMarketsforIdentical Assets or Liabilities (Level 1)SignificantOther ObservableInputs (Level 2)SignificantOther Unobservable Inputs (Level 3)Total Assets:AmerenDerivative assets commodity contracts (a): Fuel oils$-$-$1$1 Natural gas

$-$3$-$3 Power--11 11Total derivative assets commodity contracts$-$3$12$15 Nuclear decommissioning trust fund:

Cash and cash equivalents

$3$-$-$3 Equity securities:

U.S. large capitalization 393--393 Debt securities:

U.S. treasury and agency securities

-120-120 Corporate bonds 64 Other-17-17Total nuclear decommissioning trust fund$396$201$-$597 (b)Total Ameren

$396$204$12$612AmerenDerivative assets commodity contracts (a):MissouriFuel oils

$-$-$1$1 Power--11 11Total derivative assets commodity contracts$-$-$12$12 Nuclear decommissioning trust fund:

Cash and cash equivalents

$3$-$-$3 Equity securities:

U.S. large capitalization 393--393 Debt securities:

U.S. treasury and agency securities

-120-120 Corporate bonds 64 Other-17-17Total nuclear decommissioning trust fund$396$201$-$597 (b)Total Ameren Missouri

$396$201$12$609AmerenDerivative assets commodity contracts (a):IllinoisNatural gas

$-$3$-$3 Liabilities:

AmerenDerivative liabilities commodity contracts (a): Fuel oils$9$-$-$9 Natural gas 27 Power--174 174 Uranium--5 5 Total Ameren

$9$27$179$215AmerenDerivative liabilities commodity contracts (a):MissouriFuel oils

$9$-$-$9 Natural gas 9 Power--2 2 Uranium--5 5 Total Ameren Missouri

$9$9$7$25AmerenDerivative liabilities commodity contracts (a):IllinoisNatural gas

$-$18$-$18 Power--172 172 Total Ameren Illinois

$-$18$172$190(a) The derivative asset and liability balances are presented net of counterparty credit considerations.(b) Balance excludes $2 million of receivables, payables, and accrued income, net.

27The following table sets forth, by level within the fair value hierarchy, our assets and liabilities measured at fair value on a recurring basis as of December31, 2015:

QuotedPricesin ActiveMarketsforIdentical Assets or Liabilities (Level 1)SignificantOther ObservableInputs (Level 2)SignificantOther Unobservable Inputs (Level 3)Total Assets:AmerenDerivative assets commodity contracts (a): Natural gas

$-$1$1$2 Power--16 16Total derivative assets commodity contracts$-$1$17$18 Nuclear decommissioning trust fund:

Cash and cash equivalents

$4$-$-$4 Equity securities:

U.S. large capitalization 364--364 Debt securities:

U.S. treasury and agency securities

-109-109 Corporate bonds 58 Other-22-22Total nuclear decommissioning trust fund$368$189$-$557 (b)Total Ameren

$368$190$17$575AmerenDerivative assets commodity contracts (a):MissouriNatural gas

$-$-$1$1 Power--16 16Total derivative assets commodity contracts$-$-$17$17 Nuclear decommissioning trust fund:

Cash and cash equivalents

$4$-$-$4 Equity securities:

U.S. large capitalization 364--364 Debt securities:

U.S. treasury and agency securities

-109-109 Corporate bonds 58 Other-22-22Total nuclear decommissioning trust fund$368$189$-$557 (b)Total Ameren Missouri

$368$189$17$574AmerenDerivative assets commodity contracts (a): Illinois Natural gas

$-$1$-$1 Liabilities:

AmerenDerivative liabilities commodity contracts (a): Fuel oils$29$-$-$29 Natural gas 1 62 1 64 Power--170 170 Uranium--1 1 Total Ameren

$30$62$172$264AmerenDerivative liabilities commodity contracts (a):MissouriFuel oils

$29$-$-$29 Natural gas

-13 1 14 Uranium--1 1 Total Ameren Missouri

$29$13$2$44AmerenDerivative liabilities commodity contracts (a): Illinois Natural gas

$1$49$-$50 Power--170 170 Total Ameren Illinois

$1$49$170$220(a) The derivative asset and liability balances are presented net of counterparty credit considerations.(b) Balance excludes $(1) million of receivables, payables, and accrued income, net.

28 All costs related to financial assets and liabilities classified as Level 3 in the fair value hierarchy are expected to be recoverable through customer rates; therefore, there is no impact to net income resulting from changes in the fair value of these instruments. For the three and nine months ended September 30, 2016 and 2015, the balances and changes in the fair value of Level 3 financial assets and liabilities

associated with fuel oils, natural gas, and uranium were immaterial.

The following table summarizes the changes in the fair value of power financial assets and liabilities classified as Level 3 in the fair value hierarchy:

Net derivative commodity contracts Ameren Missouri Ameren Illinois Ameren For the three months ended September 30, 2016

Beginning balance at July1, 2016

$14$(169)$(155)Realized and unrealized gains (losses) included in regulatory assets/liabilities

-(6)(6)Settlements (5)3 (2)Ending balance at September 30, 2016

$9$(172)$(163)Change in unrealized gains (losses) related to assets/liabilities held at September 30, 2016

$-$(2)$(2)For the three months ended September 30, 2015 Beginning balance at July1, 2015

$27$(165)$(138)Realized and unrealized gains (losses) included in regulatory assets/liabilities 2 (8)(6)Settlements (7)3 (4)Ending balance at September 30, 2015

$22$(170)$(148)Change in unrealized gains (losses) related to assets/liabilities held at September 30, 2015$1$(7)$(6)For the nine months ended September 30, 2016 Beginning balance at January1, 2016

$16$(170)$(154)Realized and unrealized gains (losses) included in regulatory assets/liabilities (4)(13)(17)Purchases 13-13 Settlements(16)11 (5)Ending balance at September 30, 2016

$9$(172)$(163)Change in unrealized gains (losses) related to assets/liabilities held at September 30, 2016

$-$(7)$(7)For the nine months ended September 30, 2015

Beginning balance at January1, 2015

$9$(142)$(133)Realized and unrealized gains (losses) included in regulatory assets/liabilities

-(37)(37)Purchases 29-29 Settlements(16)9 (7)Ending balance at September 30, 2015

$22$(170)$(148)Change in unrealized gains (losses) related to assets/liabilities held at September 30, 2015$1$(35)$(34)Transfers into or out of Level 3 represent either (1)existing assets and liabilities that were previously categorized as a higher level, but were recategorized to Level 3 because the inputs to the model became unobservable during the period or (2)existing assets and liabilities

that were previously classified as Level 3, but were recategorized to a higher level because the lowest significant input became observable during the period. For the three and nine months ended September30, 2016 and 2015, there were no material transfers between Level 1

and Level 2, Level 1 and Level 3, or Level 2 and Level 3 related to derivative commodity contracts.The Ameren Companies' carrying amounts of cash and cash equivalents approximate fair value because of the short-term nature of these instruments. They are considered to be Level 1 in the fair value hierarchy. The Ameren Companies' short-term borrowings also

approximate fair value because of their short-term nature. Short-term borrowings are considered to be Level 2 in the fair value hierarchy as they are valued based on market rates for similar market transactions. The estimated fair value of long-term debt and preferred stock is

based on the quoted market prices for same or similar issuances for companies with similar credit profiles or on the current rates of fered to the Ameren Companies for similar financial instruments, which fair value measurement is considered to be Level 2 in the fair value hierarchy.

The following table presents the carrying amounts and estimated fair values of our long-term debt, capital lease obligations and preferred stock at September30, 2016, and December31, 2015:

29 September 30, 2016 December 31, 2015 Carrying Amount FairValue Carrying Amount FairValue Ameren: Long-term debt and capital lease obligations (including current portion)$7,038$7,971

$7,275$7,814 Preferred stock (a)142 131 142 125 Ameren Missouri:

Long-term debt and capital lease obligations (including current portion)$4,000$4,551

$4,110$4,449 Preferred stock 80 79 80 75 Ameren Illinois:

Long-term debt (including current portion)$2,344$2,682

$2,471$2,665 Preferred stock 62 52 62 50(a) Preferred stock is recorded in "Noncontrolling Interests" on the consolidated balance sheet.NOTE 8 - RELATED PARTY TRANSACTIONS Ameren (parent) and its subsidiaries have engaged in, and may in the future engage in, affiliate transactions in the normal course of business. These transactions primarily consist of power

purchases and sales, services received or rendered, and

borrowings and lendings.Transactions between affiliates are reported as intercompany transactions on their respective financial statements but are eliminated in consolidation for Ameren's

financial statements. For a discussion of our material related party agreements, see Note 14 - Related Party Transactions

under Part II, Item8, of the Form 10-K and the money pool

arrangements discussed in Note 3 - Short-term Debt and

Liquidity of this report.Electric Power Supply Agreements In April and September 2016, Ameren Illinois conducted procurement events, administered by the IPA, to purchase energy products. Ameren Missouri was among the winning suppliers in these events. As a result, in April 2016, Ameren Missouri and Ameren Illinois entered into an energy product agreement by which Ameren Missouri agreed to sell, and Ameren Illinois agreed to purchase, 375,200 megawatthours at an average price of $34.71 per megawatthour during the period of

June 1, 2017, through September 30, 2018. In September 2016, Ameren Missouri and Ameren Illinois entered into an energy product agreement by which Ameren Missouri agreed to sell, and Ameren Illinois agreed to purchase, 82,800 megawatthours at an average price of $34.35 per megawatthour during the period of

May 1, 2017, through September 30, 2018.The following table presents the impact on Ameren Missouri and Ameren Illinois of related party transactions for the three and nine months ended September 30, 2016 and 2015:

Three Months Nine Months Agreement Income Statement Line Item Ameren Missouri Ameren Illinois Ameren Missouri Ameren IllinoisAmeren Missouri power supplyOperating Revenues2016$9$(a)$

21$(a)agreements with Ameren Illinois 2015 4 (a)9 (a)Ameren Missouri and Ameren IllinoisOperating Revenues 2016 5 1 18 3 rent and facility services 2015 6 1 19 3Ameren Missouri and Ameren IllinoisOperating Revenues 20161(b)1 (b)miscellaneous support services 2015 1 (b)2 (b)Total Operating Revenues2016$15$1$40$3 2015 11 1 30 3 Ameren Illinois power supply Purchased Power2016$(a)$9$(a)$21 agreements with Ameren Missouri 2015 (a)4 (a)9 Ameren Illinois transmission Purchased Power 2016 (a)1 (a)2 services with ATXI 2015 (a)1 (a)2 Total Purchased Power2016$(a)$10$(a)$23 2015 (a)5 (a)11Ameren Services support servicesOther Operations and Maintenance2016$30$29$96$90 agreement 2015 30 28 96 87Money pool borrowings (advances)Interest Charges/ Miscellaneous Income2016$(b)$(b)$(b)$(b)2015 (b)(b)(b)(b)(a) Not applicable.(b) Amount less than $1 million.

30NOTE 9 - COMMITMENTS AND CONTINGENCIESWe are involved in legal, tax and regulatory proceedings before various courts, regulatory commissions, authorities and governmental agencies with respect to matters that arise in the ordinary course of business, some of which involve substantial amounts of money. We believe that the final disposition of these proceedings, except as otherwise disclosed in the notes to our financial statements in this report and in our Form 10-K, will not have a material adverse effect on our results of operations, financial position, or liquidity.Reference is made to Note 1 - Summary of Significant Accounting Policies, Note 2 - Rate and Regulatory Matters, Note 14 - Related Party Transactions, Note 15 - Commitments and Contingencies, and Note 16 - Divestiture Transactions and Discontinued Operations under Part II, Item8, of the Form 10-K. See also Note 2 - Rate and Regulatory Matters, Note 8 - Related Party Transactions, and Note 10 -

Callaway Energy Center.

Callaway Energy CenterThe following table presents insurance coverage at Ameren Missouri's Callaway energy center at September30, 2016. The property coverage and the nuclear liability coverage renewal dates are April1 and January1, respectively, of each year. Both coverages were renewed in 2016.

Type and Source of Coverage MaximumCoverages MaximumAssessments for Single Incidents Public liability and nuclear worker liability:

American Nuclear Insurers$375$-Pool participation 12,986 (a)127 (b)$13,361 (c)$127Property damage:

NEIL$2,750 (d)$30 (e)European Mutual Association for Nuclear Insurance 450 (f)-$3,200$30 Replacement power:

NEIL$490 (g)$7 (e)(a) Provided through mandatory participation in an industrywide retrospective premium assessment program.(b) Retrospective premium under the Price-Anderson Act. This is subject to retrospective assessment with respect to a covered loss in excess of $375 million in the event of an incident at any licensed United States commercial reactor, payable at $19 million per year.(c) Limit of liability for each incident under the Price-Anderson liability provisions of the Atomic Energy Act of 1954, as amended. A company could be assessed up to $127 million per incident for each licensed reactor it operates with a maximum of $19 million per incident to be paid in a calendar year for each reactor. This limit is subject to change to account for the effects of inflation and changes in the number of licensed reactors.(d) NEIL provides $2.75 billion in property damage, decontamination, and premature decommissioning insurance for radiation events. NEIL provides $2.3 billion in property damage for nonradiation events. (e) All NEIL insured plants could be subject to assessments should losses exceed the accumulated funds from NEIL.

(f) European Mutual Association for Nuclear Insurance provides $450 million in excess of the $2.75 billion and $2.3 billion property coverage for radiation and nonradiation events, respectively, provided by NEIL.(g) Provides replacement power cost insurance in the event of a prolonged accidental outage. Weekly indemnity up to $4.5 million for 52 weeks, which commences after the first twelve weeks of an outage, plus up to $3.6 million per week for a minimum of 71 weeks thereafter for a total not exceeding the policy limit of $490 million.

Nonradiation events are sub-limited to $328 million.The Price-Anderson Act is a federal law that limits the liability for claims from an incident involving any licensed United States commercial nuclear energy center. The limit is based on the number of licensed reactors. The limit of liability and the maximum potential annual payments are adjusted at least every five years for inflation to reflect changes in the Consumer Price Index. The most recent five-year inflationary adjustment became effective in September 2013. Owners of a nuclear reactor cover this exposure through a combination of private insurance and mandatory participation in a financial protection pool, as established by the Price-Anderson Act.Losses resulting from terrorist attacks on nuclear facilities are covered under NEIL's insurance policies, subject to an industrywide aggregate policy limit of $3.24 billion within a 12-month period, or $1.83 billion for events not involving radiation contamination.

If losses from a nuclear incident at the Callaway energy center exceed the limits of, or are not covered by insurance, or if coverage is unavailable, Ameren Missouri is at risk for any uninsured losses. If a serious nuclear incident were to occur, it could have a material adverse effect on Ameren's and Ameren Missouri's results of operations, financial position, or liquidity.

31 Other Obligations In order to supply a portion of the fuel requirements of Ameren Missouri's energy centers, Ameren Missouri has entered into various long-term commitments for the procurement of coal, natural gas, nuclear fuel, and methane gas. Additionally, Ameren Missouri and Ameren Illinois have entered into various long-term

commitments for purchased power and natural gas for distribution. At September30, 2016, total obligations related to

commitments for coal, natural gas, nuclear fuel, purchased power, methane gas, equipment, and meter reading services, among other agreements, at Ameren, Ameren Missouri, and Ameren Illinois were $4,328 million, $2,428 million, and $1,859 million, respectively. For additional information regarding our

obligations and commitments at December 31, 2015, see Note 15

- Commitments and Contingencies under Part II, Item 8 of the

Form 10-K. In April and September 2016, Ameren Illinois conducted procurement events, administered by the IPA, to purchase energy products and capacity through May 31, 2019. In the April procurement event, Ameren Illinois contracted to purchase approximately 3,609,800 megawatthours of energy products for

$105 million from June 1, 2016, through May 31, 2019. In the September procurement event, Ameren Illinois contracted to purchase approximately 2,229,800 megawatthours of energy products for $71 million from October 1, 2016, through May 31, 2019. In addition, in the September procurement event, Ameren Illinois contracted to purchase 1,854 MWs of capacity for $96 million from June 1, 2017, through May 31, 2019. The results of both procurement events are included in Ameren's and Ameren Illinois' obligations discussed above. See Note 8 - Related Party Transactions for additional information regarding energy product agreements between Ameren Missouri and Ameren Illinois as a

result of these procurement events.

Environmental MattersWe are subject to various environmental laws and regulations enforced by federal, state, and local authorities. Such requirements can impact the siting, development and operation of

new and existing generation, transmission, distribution and

natural gas storage facilities. Such requirements can encompass emissions, discharges to water, water usage, impacts to air, land, and water, and chemical and waste handling. Complex and

lengthy approval processes are required to obtain, modify or

renew permits and licenses for new or existing facilities.

Additionally, the use and handling of various chemicals or

hazardous materials at some of our facilities require release

prevention plans and emergency response procedures.The EPA has promulgated several environmental regulations that will have a significant impact on the electric utility industry.

Over time, compliance with these regulations could be costly for

Ameren Missouri, which operates coal-fired power plants.

Significant new rules include the regulation of CO 2 emissions from existing power plants through the Clean Power Plan and

from new power plants through the revised NSPS; the CSAPR, which requires further reductions of SO 2 emissions and NO x emissions from power plants; a regulation governing management and storage of CCR; the MATS, which require reduction of emissions of mercury, toxic metals, and acid gases from power plants; revised NSPS for particulate matter, SO 2 , and NO x emissions from new sources; new effluent standards applicable to wastewater discharges from power plants; and new regulations under the Clean Water Act that could require

significant capital expenditures, such as modifications to water intake structures at Ameren Missouri's energy centers. The EPA

also periodically reviews and revises national ambient air quality

standards, including those standards associated with emissions from power plants, such as particulate matter, ozone, SO 2 and NO x. Certain of these new regulations are being or are likely to be challenged through litigation, so their ultimate implementation, as

well as the timing of any such implementation, is uncertain.

Although many details of future regulations are unknown, the individual or combined effects of new environmental regulations

could result in significant capital expenditures and increased operating costs for Ameren and Ameren Missouri. Compliance

with all of these environmental laws and regulations could be

prohibitively expensive, result in the closure or alteration of the operation of some of Ameren Missouri's energy centers, or require capital investment. Ameren and Ameren Missouri expect

that these costs would be recoverable through rates, subject to MoPSC prudence review, but the nature and timing of costs and their recovery could result in regulatory lag. As of December 31, 2015, Ameren Missouri's energy centers that emit CO 2 represented approximately 20% and 35% of Ameren's and Ameren Missouri's rate base, respectively.

Ameren Missouri's current plan for compliance with existing environmental regulations for air emissions includes burning

ultra-low-sulfur coal and installing new or optimizing existing pollution control equipment. Ameren and Ameren Missouri estimate that they will need to make capital expenditures of $600 million to $700 million in the aggregate from 2016 through 2020 in order to comply with existing environmental regulations. Ameren

Missouri may be required to install additional air emissions controls beyond 2020. This estimate of capital expenditures

includes expenditures required for the CCR regulations, the Clean Water Act rule applicable to cooling water intake structures at existing power plants, and the Clean Water Act effluent

limitation guidelines applicable to steam electric generating units, all of which are discussed below. This estimate does not include the potential impacts of the Clean Power Plan discussed below.

The actual amount of capital expenditures required to comply

with existing environmental regulations may vary substantially

from the above estimate due to uncertainty as to the precise

compliance strategies that will be used and their ultimate cost, among other things.

The following sections describe the more significant new environmental laws and rules and environmental enforcement and remediation matters that affect or could affect our operations.Clean Air Act Federal and state laws require significant reductions in SO 2 and NO x through either emission source reductions or the use 32and retirement of emission allowances. The first phase of the CSAPR emission reduction requirements became effective in

2015 and the second phase of emission reduction requirements, which were revised by the EPA in September 2016, will become effective in 2017; additional emission reduction requirements may apply in subsequent years. To achieve compliance with the CSAPR, Ameren Missouri burns ultra-low-sulfur coal, operates two scrubbers at its Sioux energy center, and optimizes other existing pollution control equipment. Ameren Missouri does not

expect to make additional capital investments to comply with the 2017 CSAPR requirements. However, Ameren Missouri expects

to incur additional costs to lower its emissions at one or more of

its energy centers to comply with the CSAPR in future years.

These higher costs are expected to be recovered from customers through the FAC or higher base rates.

CO 2 Emissions Standards The Clean Power Plan, which sets forth CO 2 emissions standards applicable to existing power plants, was issued by the EPA in August 2015 but stayed by the United States Supreme

Court in February 2016, pending the outcome of various legal challenges, as discussed below.

If upheld, the Clean Power Plan would require Missouri and Illinois to reduce CO 2 emissions from power plants within their states significantly below 2005 levels by 2030. The rule contains

interim compliance periods commencing in 2022 that would

require each state to demonstrate progress in achieving its CO 2 emissions reduction target. Ameren continues to evaluate the

Clean Power Plan's potential impacts to its operations, including those related to electric system reliability, and to its level of investment in customer energy efficiency programs, renewable energy, and other forms of generation. Significant uncertainty

exists regarding the impact of the Clean Power Plan, as its

implementation will depend upon plans to be developed by the

states. Numerous legal challenges are pending, which could

result in the rule being declared invalid or the nature and timing of

CO 2 emissions reductions being revised. All implementation requirements are deferred until such time as these legal challenges are concluded. A decision by the District of Columbia Circuit Court of Appeals is expected to be issued in 2017, and

subsequent appeals to the United States Supreme Court are likely. We cannot predict the outcome of such legal challenges or

their impact on our results of operations, financial position, or liquidity. If the rule is ultimately upheld and implemented in

substantially similar form to the rule when issued, compliance

measures could result in the closure or alteration of the operation of some of Ameren Missouri's coal and natural-gas-fired energy

centers, which could result in increased operating costs and require Ameren Missouri to make new or accelerated capital expenditures. Ameren Missouri expects substantially all of these

increased costs to be recoverable, subject to MoPSC prudence review, through higher rates to customers, which could be

significant.In 2015, the EPA also issued final regulations that set CO 2 emissions standards for new power plants. These new standards establish separate emissions limits for new natural-gas-fired

combined cycle plants and new coal-fired plants.

Federal and state legislation or regulations that mandate limits on the emission of CO 2 may result in significant increases in capital expenditures and operating costs, which could lead to

increased liquidity needs and higher financing costs. Mandatory

limits on the emission of CO 2 could increase costs for Ameren Missouri's customers or have a material adverse effect on Ameren's and Ameren Missouri's results of operations, financial

position, and liquidity if regulators delay or deny recovery in rates of these compliance costs. The cost of Ameren Illinois' purchased power and gas purchased for resale could increase. However, Ameren Illinois expects these costs would be recovered from customers with no material adverse effect on its results of operations, financial position, or liquidity. Ameren's and Ameren

Missouri's earnings might benefit from increased investment to

comply with CO 2 emission limitations to the extent that the investments are reflected and recovered on a timely basis in

rates charged to customers.NSR and Clean Air Litigation In January 2011, the Department of Justice, on behalf of the EPA, filed a complaint against Ameren Missouri in the United States District Court for the Eastern District of Missouri. The

complaint, as amended in October 2013, alleges that in

performing projects at its Rush Island coal-fired energy center in 2007 and 2010, Ameren Missouri violated provisions of the Clean Air Act and Missouri law. A trial was held in the third quarter of

2016. It is not certain when a final decision will be reached in this case, and subsequent appeals are likely. Ameren Missouri

believes its defenses are meritorious and is defending itself vigorously. However, there can be no assurances that it will be successful in its efforts. The ultimate resolution of this matter could have a material adverse effect on the results of operations, financial position, and liquidity of Ameren and Ameren Missouri. A resolution of this

matter could result in increased capital expenditures for the

installation of pollution control equipment and increased operations and maintenance expenses. We are unable to predict

the ultimate resolution of this matter or the costs that might be

incurred. Clean Water ActIn 2014, the EPA issued its final rule applicable to cooling water intake structures at existing power plants.The rule requires a case-by-case evaluation and plan for reducing aquatic organisms impinged on the facility's intake screens or entrained through the plant's cooling water system. Additionally, in 2015, the EPA issued its final rule to revise the effluent limitation guidelines applicable to steam electric generating units. Effluent

limitation guidelines are national standards for water discharges that are based on the effectiveness of available control technology. The EPA's rule prohibits effluent discharges of certain

waste streams and imposes more stringent limitations on certain components in water discharges from power plants. All of Ameren Missouri's coal-fired and nuclear energy centers are subject to 33the cooling water intake structures rule and all of Ameren Missouri's coal-fired energy centers are subject to the effluent

limitations rule. Implementation of both rules will occur during the renewal process of each energy center's water discharge permit, which will occur between 2018 and 2023. The rules could have an adverse effect on Ameren's and Ameren Missouri's results of

operations, financial position, and liquidity if their implementation

requires extensive modifications to the cooling water systems and water discharge systems at Ameren Missouri's energy centers

and if those investments are not recovered on a timely basis in electric rates charged to Ameren Missouri's customers.

Ash ManagementIn 2015, the EPA issued regulations regarding the management and disposal of CCR. These regulations affect CCR disposal and handling costs at Ameren Missouri's energy centers.

The regulations allow for the management of CCR as a solid

waste, as well as for its continued beneficial uses, which could reduce the amount to be disposed. The regulations also establish criteria regarding the structural integrity, location, groundwater

monitoring, and operation of CCR impoundments and landfills.

They require closure of impoundments if the criteria are not achieved. Ameren Missouri's capital expenditure plan includes

the cost of constructing landfills as part of its environmental compliance plan. The new regulations do not apply to ash ponds

at plants no longer in operation.

RemediationThe Ameren Companies are involved in a number of remediation actions to clean up sites impacted by the use or disposal of materials containing hazardous substances. Federal

and state laws can require responsible parties to fund

remediation actions regardless of their degree of fault, the legality of original disposal, or the ownership of a disposal site. Ameren Missouri and Ameren Illinois have each been identified by federal

or state governments as a potentially responsible party at several

contaminated sites. As of September30, 2016, Ameren Illinois owned or was otherwise responsible for 44 former MGP sites in Illinois, which

are in various stages of investigation, evaluation, remediation, and closure. Ameren Illinois estimates it could substantially conclude remediation efforts by 2025. The ICC allows Ameren

Illinois to recover remediation and litigation costs associated with its former MGP sites from its electric and natural gas utility

customers through environmental adjustment rate riders. Costs are subject to annual review by the ICC. As of September30, 2016, Ameren Illinois estimated the obligation related to these former MGP sites at $204 million to $274 million. Ameren and Ameren Illinois recorded a liability of $204 million to represent the

estimated minimum obligation for these sites, as no other amount

within the range was a better estimate. The scope of the remediation activities at these former MGP sites may increase as remediation efforts continue. Considerable

uncertainty remains in these estimates because many site-

specific factors can influence the ultimate actual costs, including

unanticipated underground structures, the degree to which groundwater is encountered, regulatory changes, local ordinances, and site accessibility. The actual costs may vary

substantially from these estimates.

Ameren Missouri participated in the investigation of various sites known as Sauget Area 2 located in Sauget, Illinois. In 2000, the EPA notified Ameren Missouri and numerous other

companies that former landfills and lagoons at those sites may

contain soil and groundwater contamination. From about 1926 until 1976, Ameren Missouri operated an energy center adjacent to Sauget Area 2. Ameren Missouri currently owns a parcel of property at Sauget Area 2 that was once used by others as a

landfill. In December 2013, the EPA issued its record of decision for Sauget Area 2 approving the investigation and the remediation

actions recommended by the potentially responsible parties.

Further negotiation among the potentially responsible parties will determine how to fund the implementation of the EPA-approved cleanup remedies. As of September30, 2016, Ameren Missouri estimated its obligation related to Sauget Area 2 at $1 million to

$2.5 million. Ameren Missouri recorded a liability of $1 million to

represent its estimated minimum obligation for this site, as no

other amount within the range was a better estimate.

Our operations or those of our predecessor companies involve the use of, disposal of, and in appropriate circumstances, the cleanup of substances regulated under environmental laws.

We are unable to determine whether such practices will result in future environmental commitments or will affect our results of operations, financial position, or liquidity.Ameren Missouri Municipal TaxesThe cities of Creve Coeur and Winchester, Missouri, on behalf of themselves and other municipalities in Ameren Missouri's service area, filed a class action lawsuit in November 2011, against Ameren Missouri in the Circuit Court of St. Louis County, Missouri. The lawsuit alleges that Ameren Missouri failed

to collect and pay gross receipts taxes or license fees on certain

revenues, including revenues from wholesale power and interchange sales. Ameren and Ameren Missouri recorded

immaterial liabilities on their respective balance sheets as of September30, 2016, and December 31, 2015, representing their

estimate of the probable loss due as a result of this lawsuit.

Ameren and Ameren Missouri believe there is a remote possibility that a liability relating to this lawsuit could be material to Ameren and Ameren Missouri's results of operations, financial position, and liquidity. Ameren Missouri believes its defenses are meritorious and is defending itself vigorously. However, there can be no assurances that Ameren Missouri will be successful in its efforts. NOTE 10 - CALLAWAY ENERGY CENTERUnder the NWPA, the DOE is responsible for disposing of spent nuclear fuel from the Callaway energy center and other commercial nuclear energy centers. Under the NWPA, Ameren

and other utilities that own and operate those energy centers are responsible for paying the disposal costs. The NWPA established 34 the fee that these utilities pay the federal government for disposing of the spent nuclear fuel at one mill, or one-tenth of one

cent, for each kilowatthour generated and sold by those plants.

The NWPA also requires the DOE to review the nuclear waste

fee annually against the cost of the nuclear waste disposal

program and to propose to the United States Congress any fee adjustment necessary to offset the costs of the program. As required by the NWPA, Ameren Missouri and other utilities have

entered into standard contracts with the DOE. Consistent with the NWPA and its standard contract, which stated that the DOE would begin to dispose of spent nuclear fuel by 1998, Ameren

Missouri had historically collected one mill from its electric

customers for each kilowatthour of electricity that it generated and sold from its Callaway energy center. Because the federal

government is not meeting its disposal obligation, the collection of this fee was suspended in May 2014. The DOE's delay in

carrying out its obligation to dispose of spent nuclear fuel from the Callaway energy center is not expected to adversely affect the continued operations of the energy center.

As a result of the DOE's failure to fulfill its contractual obligations, Ameren Missouri and other nuclear energy center

owners sued the DOE to recover costs, such as certain NRC fees

and ad valorem taxes, incurred for ongoing storage of their spent fuel. The lawsuit resulted in a settlement agreement that provides

for annual reimbursement of additional spent fuel storage and related costs. Ameren Missouri will continue to apply for

reimbursement from the DOE for allowable costs associated with

the ongoing storage of spent fuel.

Electric utility rates charged to customers provide for the recovery of the Callaway energy center's decommissioning costs, which include decontamination, dismantling, and site restoration costs, over the expected life of the nuclear energy center.

Amounts collected from customers are deposited into the

external nuclear decommissioning trust fund to provide for the Callaway energy center's decommissioning. It is assumed that

the Callaway energy center site will be decommissioned through

the immediate dismantlement method and removed from service.

Ameren and Ameren Missouri have recorded an ARO for the

Callaway energy center decommissioning costs at fair value, which represents the present value of estimated future cash outflows. Annual decommissioning costs of $7 million are included in the costs used to establish electric rates for Ameren

Missouri's customers. Every three years, the MoPSC requires

Ameren Missouri to file an updated cost study and funding analysis for decommissioning its Callaway energy center. In April

2016, the MoPSC approved no change in electric service rates for decommissioning costs based on Ameren Missouri's updated cost study and funding analysis filed in April 2015.The fair value of the trust fund for Ameren Missouri's Callaway energy center is reported as "Nuclear decommissioning trust fund" in Ameren's and Ameren Missouri's balance sheets.

This amount is legally restricted and may be used only to fund

the costs of nuclear decommissioning. Changes in the fair value

of the trust fund are recorded as an increase or decrease to the nuclear decommissioning trust fund, with an offsetting adjustment to the related regulatory liability. If the assumed return on trust assets is not earned, Ameren Missouri believes that it is probable

that any such earnings deficiency will be recovered in rates.NOTE 11 - RETIREMENT BENEFITSThe following table presents the components of the net periodic benefit cost (benefit) incurred for Ameren's pension and postretirement benefit plans for the three and nine months ended September 30, 2016 and 2015:

Pension Benefits Postretirement Benefits ThreeMonths Nine Months ThreeMonths Nine Months 20162015201620152016201520162015 Service cost$20$23$60$69$5$6$15$17 Interest cost 46 43 138 130 12 12 36 36 Expected return on plan assets(63)(62)(189)(186)(18)(17)(54)(51)Amortization of:

Prior service benefit


(1)(1)(3)(3)Actuarial loss (gain) 8 19 24 56 (3)1 (8)4 Settlement loss

---1----Net periodic benefit cost (benefit)$11$23$33$70$(5)$1$(14)$3 35Ameren Missouri and Ameren Illinois are responsible for their respective shares of Ameren's pension and postretirement costs. The following table presents the pension costs and the postretirement benefit costs (benefit) incurred for the three and nine months ended September 30, 2016 and 2015:

Pension Benefits Postretirement Benefits ThreeMonths Nine Months ThreeMonths Nine Months 20162015 2016 201520162015 2016 2015 Ameren Missouri (a)$6$14$19$42$(1)$2$(3)$6 Ameren Illinois 6 9 17 28 (3)-(10)(2)Other(1)-(3)-(1)(1)(1)(1)Ameren (a)(b)$11$23$33$70$(5)$1$(14)$3(a) Does not include the impact of the regulatory tracking mechanism for the difference between the level of pension and postretirement benefit costs incurred by Ameren Missouri under GAAP and the level of such costs included in rates.(b) Includes amounts for Ameren registrants and nonregistrant subsidiaries.NOTE 12 - DISCONTINUED OPERATIONSThere was no net income attributable to Ameren common shareholders from discontinued operations during 2016. The following table presents the components of discontinued operations in Ameren's consolidated statement of income for the three and nine months ended September 30, 2015:

2015 2015 Three Months Nine Months Operating revenues

$-$-Operating benefits (expenses)(1)2 Operating income (loss) before income tax(1)2 Income tax benefit 1 50 Income from discontinued operations, net of taxes

$-$52 During the second quarter of 2015, based on the completion of the IRS audit for 2013, Ameren removed a previously recorded reserve for unrecognized tax benefits and recognized a tax benefit from discontinued operations.See Note 16 - Divestiture Transactions and

Discontinued Operations under Part II, Item 8, of the Form 10-K for additional information related to discontinued operations.The following table presents the carrying amounts of the components of assets and liabilities of Ameren's discontinued operations, which consist primarily of AROs and related deferred income tax assets associated with the abandoned Meredosia and Hutsonville energy centers, at September30, 2016, and December 31, 2015:September 30, 2016December 31, 2015 Assets of discontinued operations Accumulated deferred income taxes, net

$15$14 Total assets of discontinued operations

$15$14 Liabilities of discontinued operations Accounts payable and other current obligations

$1$1 Asset retirement obligations (a)26 28 Total liabilities of discontinued operations

$27$29(a) Ameren has completed its retirement obligations at the Hutsonville energy center. The remaining ARO liabilities relate to the abandoned Meredosia energy center.NOTE 13 - SEGMENT INFORMATIONAmeren has two reportable segments: Ameren Missouri and Ameren Illinois. Ameren Missouri and Ameren Illinois each have one reportable segment. The Ameren Missouri segment for both Ameren and Ameren Missouri includes all of the operations of Ameren Missouri's business as described in Note 1 - Summary of Significant Accounting Policies. The Ameren Illinois segment for both Ameren and Ameren Illinois includes all of the operations of Ameren Illinois' business as described in Note 1 - Summary of Significant Accounting Policies. The category called Other primarily includes Ameren parent company activities, Ameren Services, and ATXI.

36The following table presents information about the reported revenues and net income attributable to Ameren common shareholders from continuing operations for the three and nine months ended September 30, 2016 and 2015, and total assets of continuing operations as of September30, 2016, and December31, 2015:

Three Months Ameren Missouri Ameren Illinois Other IntersegmentEliminationsAmeren 2016 External revenues$1,150$675$

34$-$1,859 Intersegment revenues 15 11(17)-Net income attributable to Ameren common shareholders from continuing operations 241 119 9-369 2015 External revenues$1,160$654$

19$-$1,833 Intersegment revenues 11 1 1 (13)-Net income attributable to Ameren common shareholders from continuing operations 239 98 6-343 Nine Months 2016 External revenues$2,733$1,892$

95$-$4,720 Intersegment revenues 40 3 2 (45)-Net income attributable to Ameren common shareholders from continuing operations 347 223 51-621 2015 External revenues$2,825$1,910$

55$-$4,790 Intersegment revenues 30 3 2 (35)-Net income attributable to Ameren common shareholders from continuing operations 341 182 26-549 As of September 30, 2016:

Total assets$13,889$9,202$1,496$(468)$

24,119 (a)As of December 31, 2015:

Total assets$13,851$8,903$1,139$(267)$

23,626 (a)(a) Excludes total assets from discontinued operations of $15 million and $14 million as of September30, 2016, and December 31, 2015, respectively.

37ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

The following discussion should be read in conjunction with the financial statements contained in this Form 10-Q, as well as Management's Discussion and Analysis of Financial Condition

and Results of Operations and Risk Factors contained in the Form 10-K.We intend for this discussion to provide the reader

with information that will assist in understanding our financial

statements, the changes in certain key items in those financial

statements, and the primary factors that accounted for those changes, as well as how certain accounting principles affect our financial statements. The discussion also provides information

about the financial results of our business segments to provide a

better understanding of how those segments and their results affect the financial condition and results of operations of Ameren as a whole. Also see the Glossary of Terms and Abbreviations at

the front of this report and in the Form 10-K.

Ameren, headquartered in St. Louis, Missouri, is a public utility holding company under PUHCA 2005. Ameren's primary assets are its equity interests in its subsidiaries, including Ameren Missouri and Ameren Illinois. Ameren's subsidiaries are separate, independent legal entities with separate businesses, assets, and liabilities. Dividends on Ameren's common stock and the payment of expenses by Ameren depend on distributions made to it by its subsidiaries. Ameren's principal subsidiaries are listed below.

  • Union Electric Company, doing business as Ameren

Missouri, operates a rate-regulated electric generation, transmission and distribution business and a rate-regulated

natural gas transmission and distribution business in

Missouri.* Ameren Illinois Company, doing business as Ameren Illinois, operates rate-regulated electric and natural gas transmission

and distribution businesses in Illinois. Additionally, Ameren has a subsidiary, ATXI, that operates a FERC rate-regulated electric transmission business. ATXI is

developing MISO-approved electric transmission projects, including the Illinois Rivers, Spoon River, and Mark Twain projects. Ameren is also pursuing projects to improve electric transmission system reliability within Ameren Missouri's and Ameren Illinois' service territories as well as evaluating

competitive electric transmission investment opportunities outside

of these territories, including investments outside of MISO.

Ameren also has various other subsidiaries that conduct activities

such as the provision of shared services.

Unless otherwise stated, the following sections of Management's Discussion and Analysis of Financial Condition

and Results of Operations exclude discontinued operations for all

periods presented. See Note 12 - Discontinued Operations under

Part I, Item 1, of this report and Note 16 - Divestiture Transactions and Discontinued Operations under Part II, Item 8, of the Form 10-K for additional information regarding the

divestiture transactions and discontinued operations

presentation.Ameren's financial statements are prepared on a consolidated basis, and therefore include the accounts of its majority-owned subsidiaries. All intercompany transactions have been eliminated. Ameren Missouri and Ameren Illinois have no

subsidiaries, and therefore their financial statements are not prepared on a consolidated basis. All tabular dollar amounts are

in millions, unless otherwise indicated.

In addition to presenting results of operations and earnings amounts in total, we present certain information in cents per share. These amounts reflect factors that directly affect Ameren's earnings. We believe this per share information helps readers to understand the impact of these factors on Ameren's earnings per

share.OVERVIEWNet income attributable to Ameren common shareholders from continuing operations was $369 million in the third quarter of 2016, compared with $343 million in the year-ago period. Net income attributable to Ameren common shareholders from continuing operations was $621 million in the first nine months of 2016, compared with $549 million in the year-ago period. Net income was favorably affected in the third quarter and the first

nine months of 2016, compared with the year-ago periods, by increased Ameren Illinois and ATXI electric transmission service and Ameren Illinois electric distribution service earnings, reflecting Ameren's strategy to allocate incremental capital to

those businesses; increased demand due to warmer summer temperatures; increased rates for Ameren Illinois' natural gas

distribution service pursuant to a December 2015 order;

decreased other operations and maintenance expenses; and the recognition of a MEEIA 2013 performance incentive. Net income was also favorably affected in the first nine months of 2016, compared with the year-ago period, by the absence of a provision recognized in the second quarter of 2015, as a result of Ameren Missouri's discontinued efforts to license and build a second

nuclear unit at its existing Callaway energy center site, as well as

an income tax benefit recorded in the first quarter of 2016 at

Ameren (parent) pursuant to the adoption of new accounting

guidance related to share-based compensation. Net income was unfavorably affected in the third quarter and the first nine months

of 2016, compared with the year-ago periods, by decreased electric demand at Ameren Missouri resulting from a reduction in sales to the New Madrid Smelter, decreased Ameren Missouri earnings resulting from the absence in 2016 of MEEIA 2013 net

shared benefits, and increased depreciation and amortization expenses, primarily at Ameren Missouri. Additionally, earnings were unfavorably affected in the first nine months of 2016, compared to the year-ago period, by the cost of the Callaway energy center's scheduled refueling and maintenance outage, the absence in 2016 of a January 2015 ICC order regarding Ameren Illinois' cumulative power usage cost and its purchased power rider mechanism, and decreased Ameren Missouri electric

margins resulting from increased transmission charges, net of

transmission revenues. Net income was also unfavorably affected in the third quarter of 2016, compared to the year-ago period, by decreased Ameren Illinois natural gas distribution

earnings due to seasonal rate redesign.

38 Ameren remains focused on executing its strategy of investing in and operating its utilities in a manner consistent with existing regulatory frameworks, enhancing those frameworks and

advocating for responsible energy policies, as well as creating

and capitalizing on investment opportunities for the benefit of its customers and shareholders. Ameren continues to allocate

significant amounts of capital to those businesses that are

supported by regulatory frameworks that provide predictable and timely cost recovery. Ameren invested approximately $1 billion of its $1.5 billion in capital expenditures during the first nine months

of 2016 in FERC-regulated electric transmission projects and

Ameren Illinois electric and natural gas distribution service

infrastructure.

Ameren invested approximately $510 million during the first nine months of 2016 in FERC-regulated transmission projects, including Ameren Illinois' continued significant transmission investments to improve reliability. Construction continues on ATXI's $1.4 billion Illinois Rivers and $150 million Spoon River

transmission projects. Pre-construction steps continue to be made on the $225 million Mark Twain project. In October 2016, ATXI filed suit in the circuit courts of each of the five counties where the Mark Twain project will be constructed to obtain assents for road crossings. A decision from each of the county circuit courts is expected in 2017. ATXI plans to complete the project in 2018; however, delays in obtaining the assents could delay the completion date. The completion of the Illinois Rivers, Spoon River, and Mark Twain transmission projects will provide

customers with improved reliability and access to additional

renewable energy sources, including wind power from the

western and northern parts of the MISO region, including

northeast Missouri.

In September 2016, the FERC issued a final order in the November 2013 complaint case which lowered the allowed base return on common equity to 10.32%. The new allowed base

return on common equity is reflected in rates prospectively from the September 2016 effective date of the order. The FERC is

expected to issue a final order in the February 2015 complaint case in the second quarter of 2017. The final order in the

February 2015 complaint case will determine the allowed base

return on common equity for the 15-month period ended May 2016. The final order in the February 2015 complaint case will

also establish the allowed base return on common equity that will

apply prospectively from its expected second quarter 2017 effective date, replacing the 10.32% allowed base return on common equity, which became effective in September 2016. The 12.38% allowed base return on common equity was effective for

the period that began at the conclusion of the 15-month period for

the February 2015 complaint case in May 2016 through the September 2016 effective date of the final order in the November

2013 complaint case.

Ameren Illinois has invested approximately $480 million in electric and natural gas distribution infrastructure projects in the

first nine months of 2016. It remains on track to meet its remaining investment, reliability, and smart meter goals under the IEIMA. In April 2016, Ameren Illinois filed with the ICC its annual

electric distribution service formula rate update to establish the revenue requirement used for 2017 rates. Pending ICC approval, Ameren Illinois' update filing will result in a

$14 million decrease in Ameren Illinois' electric distribution service revenue requirement, beginning in January 2017. An ICC decision on the

revenue requirement used for 2017 rates is expected by

December 2016.In July 2016, Ameren Missouri filed a request with the MoPSC seeking approval to increase its annual revenues for electric service by $206 million. The request includes recovery of, and a return on, new infrastructure investments, recovery of fixed costs related to the loss of sales to the New Madrid Smelter, and increased transmission charges. Ameren Missouri also requested continued use of its FAC and the regulatory tracking mechanisms

for pension and postretirement benefits and uncertain income tax

positions that the MoPSC previously authorized in earlier electric rate orders. Additionally, Ameren Missouri requested the

implementation of a new regulatory tracking mechanism for transmission charges and revenues. A decision by the MoPSC is expected by late April 2017, with new rates effective in late May 2017. Ameren Missouri continues to pursue a modernized

regulatory framework that supports investment to upgrade aging

electric infrastructure and reduces regulatory lag.In the third quarter of 2016, Ameren Missouri recognized $19 million of revenue related to the MEEIA 2013 performance incentive based on a stipulation agreement between Ameren Missouri and the MoPSC staff, which was filed with the MoPSC in September 2016. In November 2016, the MoPSC approved a

$28 million MEEIA 2013 performance incentive based on a revised stipulation agreement between Ameren Missouri, the MoPSC staff, and the MoOPC. As a result, Ameren Missouri will

recognize $9 million of additional revenues in the fourth quarter of 2016 relating to the MEEIA 2013 performance incentive. Further, the revised stipulation agreement included a provision to incorporate the results of the appeal, discussed below, regarding

the determination of an input used to calculate the performance incentive. In November 2015, the MoPSC issued an order

regarding the determination of an input used to calculate the performance incentive. Ameren Missouri filed an appeal of the order with the Missouri Court of Appeals, Western District, which

is expected to issue a decision in 2016. If the Missouri Court of Appeals, Western District, overturns the November 2015 MoPSC order, Ameren Missouri may recognize additional revenues in

excess of the $28 million approved by the MoPSC in November

2016. Reflecting confidence in Ameren's outlook and long-term strategy, in October 2016, Ameren's board of directors increased

the quarterly common stock dividend to 44 cents per share, resulting in an annualized equivalent dividend rate of $1.76 per

share. RESULTS OF OPERATIONSOur results of operations and financial position are affected by many factors. Weather, economic conditions, energy efficiency

investments by our customers and us, and the actions of key customers can significantly affect the demand for our services.

39Our results are also affected by seasonal fluctuations in winter heating and summer cooling demands. Ameren and Ameren Missouri are also affected by nuclear refueling and other energy center maintenance outages. Additionally, fluctuations in interest rates and conditions in the capital and credit markets affect our

cost of borrowing and our pension and postretirement benefits costs. Almost all of Ameren's revenues are subject to state or federal regulation. This regulation has a material impact on the

prices we charge for our services. Our results of operations, financial position, and liquidity are affected by our ability to align

our overall spending, both operating and capital, with regulatory

frameworks established by our regulators.

Ameren Missouri principally uses coal, nuclear fuel, and natural gas for fuel in its electric operations and purchases natural gas for its customers. Ameren Illinois purchases power and natural gas for its customers. The prices for these

commodities can fluctuate significantly because of the global economic and political environment, weather, supply, and demand, and many other factors. We have natural gas cost

recovery mechanisms for our Illinois and Missouri natural gas

distribution service businesses, a purchased power cost recovery mechanism for Ameren Illinois' electric distribution service business, and a FAC for Ameren Missouri's electric utility

business.

Ameren Illinois' electric distribution service utility business, pursuant to the IEIMA, conducts an annual reconciliation of the

revenue requirement necessary to reflect the actual costs

incurred in a given year with the revenue requirement included in customer rates for that year, with recoveries from, or refunds to, customers made in a subsequent year. Included in Ameren

Illinois' revenue requirement reconciliation is a formula for the return on equity, which is equal to the average of the monthly yields of 30-year United States Treasury bonds plus 580 basis points. Therefore, Ameren Illinois' annual return on equity is directly correlated to yields on United States Treasury bonds.

Ameren Illinois and ATXI use a company-specific, forward-looking rate formula framework in setting their transmission rates. These rates are updated each January with forecasted information. A reconciliation during the year, which adjusts for the actual

revenue requirement and actual sales volumes, is used to adjust billing rates in a subsequent year. Ameren Illinois' and ATXI's electric transmission service businesses and Ameren Illinois' electric distribution service

business operate under formula ratemaking, designed to provide

for the recovery of actual costs of service that are prudently incurred as well as a return on equity. While rate-regulated, Ameren Illinois' natural gas business and Ameren Missouri do not operate under formula ratemaking. Ameren (parent) is not rate-

regulated.We employ various risk management strategies to reduce our exposure to commodity risk and other risks inherent in our business. The reliability of Ameren Missouri's energy centers and

our transmission and distribution systems and the level of

purchased power costs, operations and maintenance costs, and

capital investment are key factors that we seek to manage in

order to optimize our results of operations, financial position, and liquidity.

Earnings SummaryThe following table presents a summary of Ameren's earnings for the three and nine months ended September 30, 2016 and 2015:

Three Months Nine Months2016201520162015 Net income attributable to Ameren common shareholders$369$343$621$601 Earnings per common share diluted 1.52 1.41 2.56 2.47Net income attributable to Ameren common shareholders continuing operations$369$343$621$549 Earnings per common share diluted continuing operations 1.52 1.41 2.56 2.26Net income attributable to Ameren common shareholders from continuing operations increased $26 million, or 11 cents per diluted share, in the third quarter of 2016 compared with the same period in 2015. The increase between periods was due to a

$21 million increase in net income from the Ameren Illinois segment, a $3 million increase in net income from Ameren (parent) and nonregistrant subsidiaries, which included an increase in ATXI's net income of $8 million, and a $2 million increase in net income from the Ameren Missouri segment.Net income attributable to Ameren common shareholders from continuing operations increased $72 million, or 30 cents per diluted share, in the first nine months of 2016 compared to the same period in 2015. The increase between periods was due to a

$41 million increase in net income from the Ameren Illinois segment, a $25 million increase in net income from continuing operations at Ameren (parent) and nonregistrant subsidiaries, which included an increase in ATXI's net income of $20 million, and a $6 million increase in net income from the Ameren Missouri

segment. There was no net income attributable to Ameren common shareholders from discontinued operations in both the third quarter and the first nine months of 2016, compared with no net income and $52 million, respectively, in the year-ago periods.

During the second quarter of 2015, based on the completion of the IRS audit for 2013, Ameren removed a previously recorded

reserve for unrecognized tax benefits of $53 million related to the divestiture of New AER and recognized a tax benefit from

discontinued operations.

40 Earnings per share from continuing operations were favorably affected in the third quarter and the first nine months of 2016, compared with the year-ago periods (except where a

specific period is referenced), by:* the absence of a provision recognized in the second quarter of 2015 as a result of Ameren Missouri's discontinued efforts to license and build a second nuclear unit at its existing Callaway energy center site (18 cents per share for the nine months ended September 30, 2016);* increased Ameren Illinois and ATXI electric transmission service and Ameren Illinois electric distribution service

earnings under formula ratemaking due to additional rate

base investment (7 cents per share and 16 cents per share, respectively). Additionally, Ameren Illinois and ATXI electric

transmission service third quarter earnings benefited from a temporarily higher allowed base return on common equity, recognizing an allowed base return on common equity of 12.38% from mid-May, as a result of the expiration of the

refund period in the February 2015 complaint case, to nearly the end of September. This earnings increase was partially offset by a lower allowed base return on common equity

recognized through mid-May 2016 in the nine month period as well as a lower return on equity related to Ameren Illinois

electric distribution service investments due to a reduction in the 30-year United States Treasury bond yields (2 cents per

share and 1 cent per share, respectively);

  • increased demand due to warmer summer temperatures in 2016, partially offset by milder winter temperatures (estimated at 11 cents per share and 9 cents per share, respectively);* higher natural gas distribution rates at Ameren Illinois pursuant to a December 2015 order (3 cents per share and

9 cents per share, respectively);

  • a decrease in the effective tax rate primarily due to an income tax benefit recorded at Ameren (parent) pursuant to

the adoption of new accounting guidance related to share-based compensation (7 cents per share for the nine months ended September 30, 2016);

  • decreased other operations and maintenance expenses not subject to riders, regulatory tracking mechanisms, or formula ratemaking, primarily at Ameren Missouri (2 cents per share and 5 cents per share, respectively). This was due, in part, to a reduction in energy center maintenance costs, excluding the cost of the Callaway energy center's

scheduled refueling and maintenance outage (discussed

below) and reduced electric distribution maintenance

expenditures; and* the recognition of a MEEIA 2013 performance incentive (5 cents per share for both periods).

Earnings per share from continuing operations were unfavorably affected in the third quarter and the first nine months of 2016, compared with the year-ago periods (except where a

specific period is referenced), by:* decreased electric demand at Ameren Missouri resulting from a reduction in sales to the New Madrid Smelter (5 cents per share and 13 cents per share, respectively);* decreased Ameren Missouri earnings resulting from the absence in 2016 of MEEIA net shared benefits due to the expiration of MEEIA 2013 (5 cents per share and 12 cents

per share, respectively);

  • the cost of the Callaway energy center's scheduled refueling

and maintenance outage in the second quarter of 2016.

There was no Callaway refueling and maintenance outage in 2015 (8 cents per share for the nine months ended September 30, 2016);

  • decreased Ameren Illinois earnings resulting from the absence in 2016 of a January 2015 ICC order regarding Ameren Illinois' cumulative power usage cost and its

purchased power rider mechanism (4 cents per share for the nine months ended September 30, 2016);

  • decreased Ameren Missouri electric margins resulting from increased transmission charges, net of transmission revenues (3 cents per share for the nine months ended September 30, 2016);* increased depreciation and amortization expenses not subject to riders, regulatory tracking mechanisms, or formula

ratemaking, primarily because of electric system capital additions at Ameren Missouri (2 cents per share and 3 cents

per share, respectively); and

  • decreased Ameren Illinois natural gas distribution earnings due to seasonal rate redesign, which is not expected to materially affect earnings comparisons on an annual basis (2 cents per share for the three months ended September

30, 2016).

The cents per share information presented in the explanations above is based on the average diluted shares outstanding in the third quarter and first nine months of 2015. For additional details regarding the Ameren Companies' results of

operations, including explanations of Margins, Other Operations

and Maintenance Expenses, Provision for Callaway Construction and Operating License, Depreciation and Amortization, Taxes Other Than Income Taxes, Other Income and Expenses, Interest Charges, and Income Taxes, see the major headings below.

41Below is a table of income statement components by segment for the three and nine months ended September 30, 2016 and 2015:

Ameren Missouri Ameren Illinois Other /IntersegmentEliminationsAmeren Three Months 2016:

Electric margins$862$452$28$1,342 Natural gas margins 14 86-100 Other revenues 1-(1)-Other operations and maintenance(220)(198)7(411)Depreciation and amortization(130)(80)(1)(211)Taxes other than income taxes(96)(30)(3)(129)Other income (expense) 12 1 (3)10 Interest charges(53)(35)(9)(97)Income taxes(148)(77)(8)(233)Income from continuing operations 242 119 10 371 Income from discontinued operations, net of tax


Net income 242 119 10 371 Noncontrolling interests preferred dividends(1)-(1)(2)Net income attributable to Ameren common shareholders$241$119$9$369 Three Months 2015:

Electric margins$863$412$13$1,288 Natural gas margins 14 82 (1)95 Other revenues 1-(1)-Other operations and maintenance(233)(202)7(428)Depreciation and amortization(125)(74)(2)(201)Taxes other than income taxes(97)(29)(2)(128)Other income 11 1 2 14 Interest charges(54)(33)-(87)Income taxes(140)(59)(9)(208)Income from continuing operations 240 98 7 345 Income from discontinued operations, net of tax


Net income 240 98 7 345 Noncontrolling interests preferred dividends(1)-(1)(2)Net income attributable to Ameren common shareholders$239$98$6$343 42 Ameren Missouri Ameren Illinois Other /IntersegmentEliminationsAmeren Nine Months 2016:

Electric margins$1,939$1,061$

76$3,076 Natural gas margins 57 336 (1)392 Other revenues 1-(1)-Other operations and maintenance(670)(592)16(1,246)Depreciation and amortization(384)(237)(7)(628)Taxes other than income taxes(252)(98)(8)(358)Other income (expense) 32 4 (3)33 Interest charges(158)(105)(24)(287)Income (taxes) benefit(215)(144)3(356)Income from continuing operations 350 225 51 626 Income from discontinued operations, net of tax


Net income 350 225 51 626 Noncontrolling interests preferred dividends(3)(2)-(5)Net income attributable to Ameren common shareholders$347$223$51$621 Nine Months 2015:

Electric margins$1,995$999$

36$3,030 Natural gas margins 58 320 (1)377 Other revenues 2-(2)-Other operations and maintenance(673)(606)23(1,256)Provision for Callaway construction and operating license(69)--(69)Depreciation and amortization(367)(220)(7)(594)Taxes other than income taxes(262)(101)(6)(369)Other income (expense) 29 5 (2)32 Interest charges(164)(99)(1)(264)Income taxes(205)(114)(14)(333)Income from continuing operations 344 184 26 554 Income from discontinued operations, net of tax

--52 52 Net income 344 184 78 606 Noncontrolling interests preferred dividends(3)(2)-(5)Net income attributable to Ameren common shareholders$341$182$78$601 43 Margins The following table presents the favorable (unfavorable) variations by segment for electric and natural gas margins in the three and nine months ended September30, 2016, compared with the year-ago periods. Electric margins are defined as electric revenues less fuel and purchased power costs. Natural gas margins are defined as gas revenues less gas purchased for resale. We consider electric and natural

gas margins useful measures to analyze the change in profitability of our electric and natural gas operations between periods. W e have included the analysis below as a complement to the financial information we provide in accordance with GAAP. However, these margins may not be a presentation defined under GAAP and may not be comparable to other companies' presentations or more useful than the GAAP

information we provide elsewhere in this report.

Three Months Ameren Missouri AmerenIllinoisOther (a)Ameren Electric revenue change:Effect of weather (estimate)(b)$41$14$-$55 Base rates (estimate) 8 Sales volume (excluding the New Madrid Smelter and the estimated effect of weather) 6 New Madrid Smelter revenues(42)--(42)Off-system sales50--50 MEEIA 2013 net shared benefits(19)--(19)MEEIA 2013 performance incentive19--19 Transmission services revenues 1181635 Other(11)(8)(6)(25)Cost recovery mechanisms - offset in fuel and purchased power: (c)Power supply costs-(25)-(25)Transmission services recovery mechanism 3 Recovery of FAC under-recovery(39)--(39)Other cost recovery mechanisms: (d)Bad debt, energy efficiency programs, and environmental remediation cost riders 6 MEEIA 2013 and 2016 program costs (7)--(7)Total electric revenue change

$(7)$22$10$25 Fuel and purchased power change:

Energy costs (excluding the New Madrid Smelter and estimated effect of weather)$(48)$-$-$(48)New Madrid Smelter energy costs22--22Effect of weather (estimate)(b)(7)(6)-(13)Transmission services charges (3)--(3)Other325 10Cost recovery mechanisms - offsets in electric revenue: (c)Power supply costs-25-25 Transmission services recovery mechanism-(3)-(3)Recovery of FAC under-recovery39--39 Total fuel and purchased power change$6$18$5$29 Net change in electric margins

$(1)$40$15$54 Natural gas revenue change:Effect of weather (estimate)(b)$-$1$-$1 Base rates (estimate) 9 Seasonal rate redesign-(6)-(6)Other-(1)1-Cost recovery mechanism - offset in gas purchased for resale: (c)Purchased gas costs 1 (6)-(5)Other cost recovery mechanisms: (d)Bad debt, energy efficiency programs, and environmental remediation cost riders 2 Total natural gas revenue change$1$(1)$1$1 Gas purchased for resale change:Effect of weather (estimate)(b)$-$(1)$-$(1)Cost recovery mechanism - offset in natural gas revenue: (c)Purchased gas costs (1)6-5 Total gas purchased for resale change

$(1)$5$-$4 Net change in natural gas margins

$-$4$1$5 44 Nine Months Ameren Missouri AmerenIllinoisOther (a)Ameren Electric revenue change:Effect of weather (estimate)(b)$33$9$-$42 Base rates (estimate)4830-78 Sales volume (excluding the New Madrid Smelter and the estimated effect of weather) 3 (1)-2 New Madrid Smelter revenues(101)--(101)Off-system sales85--85 MEEIA 2013 net shared benefits(45)--(45)MEEIA 2013 performance incentive19--19 Transmission services revenues 1424083 Purchased power rider order in 2015-(15)-(15)Other (1)(4)(11)(16)Cost recovery mechanisms offset in fuel and purchased power: (c)Power supply costs-(15)-(15)Transmission services recovery mechanism 3-3 Recovery of FAC under-recovery(88)--(88)Other cost recovery mechanisms: (d)-Gross receipts tax (4)--(4)MEEIA 2013 and 2016 program costs(20)--(20)Total electric revenue change$(70)$49$29$8 Fuel and purchased power change:

Energy costs (excluding the New Madrid Smelter and estimated effect of weather)$(77)$-$-$(77)New Madrid Smelter energy costs50--50Effect of weather (estimate)(b)(2)(2)-(4)Effect of higher net energy costs included in base rates(34)--(34)Transmission services charges(14)--(14)Other331117 Cost recovery mechanisms offsets in electric revenue: (c)Power supply costs-15-15 Transmission services recovery mechanism-(3)-(3)Recovery of FAC under-recovery88--88 Total fuel and purchased power change

$14$13$11$38 Net change in electric margins$(56)$62$40$46 Natural gas revenue change:Effect of weather (estimate)(b)$(8)$(25)$-$(33)Base rates (estimate)-34-34 Other 1 (2)-(1)Cost recovery mechanism offset in gas purchased for resale: (c)Purchased gas costs (3)(61)-(64)Other cost recovery mechanisms: (d)Bad debt, energy efficiency programs, and environmental remediation cost riders-(11)-(11)Gross receipts tax (1)(2)-(3)Total natural gas revenue change$(11)$(67)$-$(78)Gas purchased for resale change:Effect of weather (estimate)(b)$7$22$-$29 Cost recovery mechanism offset in natural gas revenue: (c)Purchased gas costs 361-64 Total gas purchased for resale change

$10$83$-$93 Net change in natural gas margins

$(1)$16$-$15(a) Primarily includes amounts for ATXI and intercompany eliminations.(b) Represents the estimated variation resulting primarily from changes in cooling and heating degree-days on electric and natural gas demand compared with the prior-year period; this variation is based on temperature readings from the National Oceanic and Atmospheric Administration weather stations at local airports in our service

territories.(c) Electric and natural gas revenue changes are offset by corresponding changes in Fuel, Purchased power, and Gas purchased for resale, resulting in no change to electric and natural gas margins.(d) See Other Operations and Maintenance Expenses or Taxes Other Than Income Taxes in this section for the related offsetting increase or decrease to expense. These items have no overall impact on earnings.

45 Ameren CorporationAmeren's electric margins increased $54 million, or 4%, and $46 million, or 2%, for the three and nine months ended September 30, 2016, respectively, compared with the year-ago periods. Ameren's natural gas margins increased $5 million, or 5%, and $15 million, or 4%, for the three and nine months ended September 30, 2016, respectively, compared with the year-ago periods. Ameren's results were primarily driven by Ameren Missouri's, Ameren Illinois', and ATXI's results of operations, as discussed below. ATXI's transmission services revenues increased $16 million and $40 million for the three and nine months ended September 30, 2016, respectively, compared with

the year-ago periods, because of higher rate base investment and recoverable costs under formula ratemaking. ATXI's results

for the three months ended September 30, 2016, also benefited from a temporarily higher allowed return on common equity, compared with the year-ago period, reflecting the May expiration

of the 15-month refund period for the February 2015 complaint

case. See Note 2

- Rate and Regulatory Matters under Part 1, Item 1, of this report for information regarding the allowed return

on common equity for FERC-regulated transmission rate base.

Ameren MissouriAmeren Missouri has a FAC cost recovery mechanism that allows it to recover or refund, through customer rates, 95% of changes in net energy costs greater or less than the amount set

in base rates without a traditional rate proceeding, subject to

MoPSC prudence reviews, with the remaining 5% of changes absorbed by Ameren Missouri. Net energy costs, as defined in the FAC, include fuel and purchased power costs, including transportation, net of off-system sales. As of May 30, 2015, transmission revenues and

substantially all transmission charges are excluded from net energy costs as a result of the April 2015 MoPSC electric rate order, which unfavorably affected margins as discussed below.

Ameren Missouri accrues as a regulatory asset net energy costs that exceed the amount set in base rates (FAC under-recovery).

Net recovery of these costs through customer rates does not affect Ameren Missouri's electric margins, as any change in revenue is offset by a corresponding change in fuel expense to reduce the previously recognized FAC regulatory asset.

Ameren Missouri's electric margins for the three months ended September 30, 2016 were comparable with the year-ago

period, and decreased $56 million, or 3%, for the nine months

ended September 30, 2016, compared with the year-ago period.

The following items had an unfavorable effect on Ameren Missouri's electric margins for the three and nine months ended September 30, 2016, compared with the year-ago periods:* The New Madrid Smelter operations were suspended in the first quarter of 2016, which decreased margins by $20 million and $51 million, respectively. The change in margins

due to lower New Madrid Smelter sales is the sum of New Madrid Smelter revenues (-$42 million and -$101 million, respectively) and New Madrid Smelter energy costs (+$22 million and +$50 million, respectively) in the above table.

New Madrid Smelter energy costs include the impact of a provision in the FAC tariff that, under certain circumstances, allows Ameren Missouri to retain a portion of the revenues from any off-system sales it makes as a result of reduced sales to the New Madrid Smelter. See Note 2 - Rate and

Regulatory Matters under Part I, Item 1, of this report for information regarding the New Madrid Smelter.* The absence in 2016 of net shared benefits due to the expiration of MEEIA 2013, which decreased margins by $19 million and $45 million, respectively. Net shared benefits compensated Ameren Missouri for lower sales volumes from energy-efficiency related volume reductions in current and

future periods.* Increased transmission services charges resulting from additional MISO-approved electric transmission investments made by other entities, which decreased margins by $3 million and $14 million, respectively.The following items had a favorable effect on Ameren Missouri's electric margins for the three and nine months ended September 30, 2016, compared with the year-ago periods (except where a specific period is referenced):* Summer temperatures for the third quarter of 2016 were warmer as cooling degree-days increased 11%, compared with the year-ago period. Temperatures in the first nine months of 2016 were warmer as cooling degree-days

increased 12%, while heating degree-days decreased 17%,

compared with the year-ago period. The net effect of

weather increased margins by an estimated $34 million and

$31 million, respectively. The change in margins due to weather is the sum of the effect of weather (estimate) on electric revenues (+$41 million and +$33 million, respectively) and the effect of weather (estimate) on fuel and purchased power (-$7 million and -$2 million, respectively) in

the above table.* The MEEIA 2013 performance incentive increased margins by $19 million for both periods. See Note 2 - Rate and

Regulatory Matters under Part I, Item 1, of this report for information regarding the MEEIA 2013 performance

incentive.* Higher electric base rates, effective May 30, 2015, as a result of the April 2015 MoPSC electric rate order, increased margins by an estimated $14 million for the nine months ended September 30, 2016. The change in electric base rates is the sum of the change in base rates (estimate) (+

$48 million) and the effect of higher net energy costs included in base rates (-$34 million) in the above table.* Lower net energy costs as a result of the 5% of changes absorbed by Ameren Missouri through the FAC, primarily

due to higher MISO capacity revenues, which increased margins by $2 million and $8 million, respectively. The change in net energy costs is the sum of the change in off-system sales (+$50 million and +$85 million, respectively) and the change in energy costs (-$48 million and -$77 million, respectively) in the above table.* Excluding the effect of reduced sales to the New Madrid Smelter and the estimated effect of weather, total retail sales volumes increased by less than 1% for the nine months 46ended September 30, 2016, which increased revenues by $3 million, due to an additional day as a result of the leap year and growth partially offset by the carryover effect of MEEIA 2013 on sales volumes. Ameren Missouri's natural gas margins were comparable between periods.

Ameren Missouri has a cost recovery mechanism for natural gas purchased on behalf of its customers. These pass-through purchased gas costs do not affect Ameren Missouri's natural gas margins as they are offset by a corresponding amount in

revenues.Ameren IllinoisThe provisions of the IEIMA's and the FERC's electric transmission formula rate frameworks provide for annual reconciliations of the electric distribution and electric transmission

service revenue requirements necessary to reflect the actual

costs incurred in a given year with the revenue requirements in customer rates for that year, including an allowed return on equity. See Operations and Maintenance Expenses in this

section for additional information regarding the components of

the revenue requirements. In each of those electric jurisdictions, if the current year's revenue requirement is greater than the revenue requirement reflected in that year's customer rates, an increase to electric operating revenues with an offset to a

regulatory asset is recorded to reflect the expected recovery of

those additional costs from customers within the next two years.

In each jurisdiction, if the current year's revenue requirement is less than the revenue requirement reflected in that year's

customer rates, a reduction to electric operating revenues with an offset to a regulatory liability is recorded to reflect the expected refund to customers within the next two years. The increases or

reductions to electric operating revenues are shown in base rates (estimate) and transmission services revenues, in the above

table, for the electric distribution and electric transmission service revenues, respectively. See Note 2 - Rate and Regulatory

Matters under Part I, Item 1, of this report for information regarding Ameren Illinois' revenue requirement reconciliation

pursuant to the IEIMA.

Ameren Illinois has a cost recovery mechanism for power purchased, and transmission services incurred, on behalf of its electric customers. These pass-through costs do not affect Ameren Illinois' electric margins, as they are offset by a

corresponding amount in revenues.Ameren Illinois' electric margins increased $40 million, or 10%, and $62 million, or 6%, for the three and nine months ended September 30, 2016, respectively, compared with the year-ago periods. The following items had a favorable effect on Ameren Illinois' electric margins for the three and nine months ended September 30, 2016, compared with the year-ago periods (except where a specific period is referenced):* Transmission services revenues increased by $18 million and $42 million, respectively, primarily due to increased rate base investment and higher recoverable costs under formula ratemaking. Transmission services for the three months

ended September 30, 2016, also benefited from a temporarily higher allowed return on common equity, compared with the year-ago period reflecting the May

expiration of the 15-month refund period for the February

2015 complaint case. See Note 2

- Rate and Regulatory Matters under Part 1, Item 1, of this report for information

regarding the allowed return on common equity for FERC-

regulated transmission rate base.* Electric distribution service revenues increased by an estimated $8 million and $30 million, respectively, primarily

due to increased rate base investment and higher

recoverable costs under formula ratemaking pursuant to the IEIMA, partially offset by a lower return on equity due to a reduction in the 30-year United States Treasury bond yields.* Summer temperatures for the third quarter of 2016 were warmer as cooling degree-days increased 13%, compared with the year-ago period. Temperatures in the first nine months of 2016 were warmer as cooling degree-days

increased 10%, while heating degree-days decreased 15%,

compared with the year-ago period. The net effect of

weather increased margins by an estimated $8 million and

$7 million, respectively. The change in margins due to weather is the sum of the effect of weather (estimate) on electric revenues (+$14 million and +$9 million, respectively) and the effect of weather (estimate) on fuel and purchased power (-$6 million and -$2 million, respectively) in the above

table.

  • Excluding the estimated effect of weather, total retail sales volumes increased by 3% for the three months ended September 30, 2016, primarily due to the commercial sector, which increased margins by an estimated $6 million. Ameren Illinois' electric margins were unfavorably affected by the absence in 2016 of a January 2015 ICC order regarding Ameren Illinois' cumulative power usage cost and its purchased

power rider mechanism, which increased margins by $15 million

in the first nine months of 2015. Ameren Illinois' natural gas margins increased $4 million, or 5%, and $16 million, or 5%, for the three and nine months ended September 30, 2016, respectively, compared with the year-ago periods. Ameren Illinois' natural gas margins were favorably affected by higher natural gas base rates in 2016, which increased margins by an estimated $9 million and $34 million, respectively. The following items had an unfavorable effect on Ameren Illinois' natural gas margins for the three and nine months ended September 30, 2016, compared with the year-ago periods (except where a specific period is referenced):* The absence of colder-than-normal winter temperatures and the application of the VBA in the first nine months of 2016, which decreased margins by $3 million compared with the year-ago period. The VBA, which was approved by the ICC

in December 2015, eliminated the impact of weather on

natural gas margins for residential and small nonresidential customers in the first nine months of 2016. The change in 47margins due to weather is the sum of the effect of weather (estimate) on natural gas revenues (-$25 million) and the effect of weather (estimate) on gas purchased for resale (+

$22 million) in the above table.

  • The implementation of redesigned seasonal rates in 2016, which decreased margins by $6 million for the third quarter of 2016, compared with the year-ago period. These redesigned rates have an effect on quarterly earnings comparisons but are not expected to materially affect annual

earnings.

Ameren Illinois has a cost recovery mechanism for natural gas purchased on behalf of its customers. These pass-through purchased gas costs do not affect Ameren Illinois' natural gas margins, as they are offset by a corresponding amount in

revenues.Other Operations and Maintenance Expenses Ameren Corporation Other operations and maintenance expenses decreased $17 million and $10 million in the third quarter and the first nine months of 2016, respectively, as compared with the year-ago periods, primarily because of decreased expenses at Ameren Missouri and Ameren Illinois.

Ameren MissouriOther operations and maintenance expenses were $13 million and $3 million lower in the third quarter and the first nine months of 2016, respectively, compared with the year-ago periods. The following items decreased other operations and maintenance expenses for the three and nine months ended September 30, 2016, compared with the year-ago periods (except where a specific period is referenced):* MEEIA customer energy efficiency program costs decreased by $7 million and $20 million, respectively, due to the expiration of MEEIA 2013, partially offset by costs incurred for MEEIA 2016. Electric revenues decreased by a corresponding amount, with no overall effect on net income.* Energy center maintenance costs, excluding refueling and maintenance outage costs at the Callaway energy center, decreased by $6 million and $18 million, respectively, primarily due to fewer major outages, partially offset by

higher coal handling charges.* Electric distribution maintenance expenditures decreased by $7 million and $12 million, respectively, primarily related

to reduced system repair and vegetation management

work.* Employee benefit costs decreased by $7 million in the nine months ended September 30, 2016, primarily due to a

change in pension and postretirement expenses allowed in rates, as a result of the April 2015 MoPSC electric rate order. Electric base rates billed to customers decreased

electric revenues by a corresponding amount, with no overall effect on net income.

  • An unrealized MTM gain in 2016 compared with an unrealized MTM loss in 2015, resulting from changes in the market value of company-owned life insurance investments, decreased expense by $6 million in both periods.

The following items increased other operations and maintenance expenses for the three and nine months ended September 30, 2016, compared with the year-ago periods (except where a specific period is referenced):* Refueling and maintenance outage costs at the Callaway energy center increased by $31 million in the nine months ended September 30, 2016, due to costs for the scheduled

refueling and maintenance outage that occurred in the second quarter of 2016. There was no scheduled outage in

2015.* Amortization of previously deferred solar rebate costs increased by $10 million in the nine months ended September 30, 2016, as a result of the April 2015 MoPSC electric rate order. Electric base rates billed to customers

increased electric revenues by a corresponding amount, with no overall effect on net income.* Litigation costs increased by $8 million and $10 million, respectively, primarily related to increases in estimated

obligations for pending legal claims.* Storm-related repair costs increased by $4 million and $7 million, respectively.

Ameren IllinoisPursuant to the provisions of the IEIMA's and the FERC's formula rate frameworks, recoverable electric service costs that

are not recovered through separate cost recovery mechanisms are included in Ameren Illinois' revenue requirement

reconciliations, which result in corresponding adjustments to electric revenues, with no overall effect on net income. These

recoverable electric service costs include other operations and

maintenance expenses, depreciation and amortization, taxes

other than income taxes, interest charges, and income taxes.Other operations and maintenance expenses were $4 million and $14 million lower in the third quarter and the first nine months of 2016, respectively, compared with the year-ago periods. The following items decreased other operations and maintenance expenses for the three and nine months ended September 30, 2016, compared with the year-ago periods (except where a specific period is referenced):* Employee benefit costs decreased by $5 million and $12 million, respectively, primarily due to lower pension and postretirement expenses caused by changes in actuarial

assumptions and the performance of plan assets.* Bad debt, customer energy efficiency, and environmental remediation costs decreased by $11 million in the nine months ended September 30, 2016. These expenses are

included in cost riders that result in lower electric and natural gas revenues, with no overall effect on net income.* Electric distribution and transmission maintenance expenditures decreased by $7 million and $5 million, respectively, primarily related to the timing of system repair

work and reduced circuit maintenance work.

48* An unrealized MTM gain in 2016 compared with an unrealized MTM loss in 2015, resulting from changes in the market value of company-owned life insurance investments, decreased expense by $4 million in both periods.

The following items increased other operations and maintenance expenses for the three and nine months ended September 30, 2016, compared with the year-ago periods (except where a specific period is referenced):* Labor costs, other than those incorporated into other explanations presented, increased by $3 million and $7 million, respectively, primarily because of staff additions to

meet enhanced standards and goals related to the IEIMA.* Storm-related repair costs increased by $4 million in the nine months ended September 30, 2016.

  • Litigation costs increased by $2 million in the nine months ended September 30, 2016.* Bad debt, customer energy efficiency, and environmental remediation costs increased by $8 million in the third quarter of 2016. These expenses are included in cost riders that

result in higher electric and natural gas revenues, with no overall effect on net income.

Provision for Callaway Construction and Operating License Primarily because of changes in vendor support for licensing efforts at the NRC, Ameren Missouri's assessment of

long-term capacity needs, declining costs of alternative

generation technologies, and the regulatory framework in Missouri, Ameren Missouri discontinued its efforts to license and

build a second nuclear unit at its existing Callaway energy center site in the second quarter of 2015. As a result of this decision, Ameren and Ameren Missouri recognized a $69 million noncash pretax provision for all of the previously capitalized COL costs.Depreciation and Amortization

Ameren CorporationDepreciation and amortization expenses increased $10 million and $34 million in the third quarter and the first nine months of 2016, respectively, compared with the year-ago periods, because of increased expenses at Ameren Missouri and Ameren Illinois, as discussed below.

Ameren MissouriDepreciation and amortization expenses increased $5 million in the third quarter of 2016, primarily because of electric system capital additions. Depreciation and amortization expenses increased $17 million in the first nine months of 2016, primarily because of increased depreciation rates resulting from the April

2015 MoPSC electric rate order and electric system capital

additions.

Ameren IllinoisDepreciation and amortization expenses increased $6 million and $17 million in the third quarter and the first nine months of 2016, respectively, primarily because of electric

system capital additions.Taxes Other Than Income Taxes

Ameren CorporationTaxes other than income taxes were comparable in the third quarter of 2016 with the year-ago period. Taxes other than income taxes decreased $11 million in the first nine months of

2016 , compared with the year-ago period, primarily because of decreased expenses at Ameren Missouri and Ameren Illinois, as discussed below. See Excise Taxes in Note 1 - Summary of Significant Accounting Policies under Part I, Item 1, of this report

for additional information.

Ameren MissouriTaxes other than income taxes were comparable in the third quarter of 2016 with the year-ago period. Taxes other than income taxes decreased $10 million in the first nine months of

2016, primarily because of decreased gross receipts taxes

resulting from lower electric sales and natural gas volumes and

decreased property taxes resulting from lower assessed property

values. Electric revenues for gross receipts taxes decreased by

an amount corresponding to the reduction in gross receipts taxes, with no overall effect on net income.

Ameren IllinoisTaxes other than income taxes were comparable in the third quarter of 2016 with the year-ago period. Taxes other than income taxes decreased $3 million in the first nine months of

2016, primarily because of decreased gross receipts taxes, resulting from lower natural gas sales volumes and prices, and

because of a decrease in property taxes between periods.

Natural gas revenues for gross receipts taxes decreased by an

amount corresponding to the reduction in gross receipts taxes, with no overall effect on net income.

Other Income and ExpensesDetails of other income and expenses for the Ameren Companies are provided in Note 5 - Other Income and Expenses under Part I, Item 1, of this report.

Interest Charges

Ameren CorporationInterest charges increased $10 million and $23 million in the third quarter and the first nine months of 2016, respectively, compared with the year-ago periods, due to an approximately

$500 million increase in average outstanding debt and an increase in the cost of debt at Ameren (parent). Ameren (parent)

issued senior unsecured notes in November 2015 to repay lower-cost short-term debt. A decrease in interest charges in the first nine months of 2016 at Ameren Missouri was partially offset by an increase in interest charges in both periods at Ameren Illinois, 49as discussed below.

Ameren MissouriInterest charges were comparable in the third quarter of 2016 with the year-ago period. Interest charges decreased $6 million in the first nine months of 2016, primarily because of a

decrease in average outstanding debt.

Ameren IllinoisInterest charges were comparable in the third quarter of 2016 with the year-ago period. Interest charges increased $6 million in the first nine months of 2016, primarily because of an

increase in average outstanding debt and interest on refunds for

the November 2013 and February 2015 complaint cases. See

Note 2 - Rate and Regulatory Matters under Part I, Item 1, of this

report for additional information about the complaint cases.Income TaxesThe following table presents effective income tax rates for the three and nine months ended September 30, 2016 and 2015:

Three Months (a)NineMonths (a)2016201520162015 Ameren 39%38%36%38%Ameren Missouri 38%37%38%37%Ameren Illinois 39%38%39%38%(a) Based on the current estimate of the annual effective tax rate adjusted to reflect the tax effect of items discrete to the relevant period.

Ameren CorporationThe effective tax rate was comparable in the third quarter of 2016 with the year-ago period.The effective tax rate was lower in the first nine months of 2016, as compared with the year-ago period, primarily because of the recognition of excess tax benefits associated with share-based compensation resulting from the difference between the

deduction for tax purposes and the compensation cost recognized for financial reporting purposes. See Accounting and

Reporting Developments in Note 1 - Summary of Significant

Accounting Policies under Part I, Item 1, of this report for

additional information.

Ameren MissouriThe effective tax rate was comparable in the third quarter and the first nine months of 2016 with the year-ago periods.

Ameren IllinoisThe effective tax rate was comparable in the third quarter and the first nine months of 2016 with the year-ago periods.

LIQUIDITY AND CAPITAL RESOURCESOur tariff-based gross margins are our principal source of cash from operating activities. A diversified retail customer mix, primarily consisting of rate-regulated residential, commercial, and

industrial customers, provides us with a reasonably predictable

source of cash. In addition to using cash generated from

operating activities, we use available cash, credit agreement borrowings, commercial paper issuances, or, in the case of Ameren Missouri and Ameren Illinois, money pool borrowings and other short-term borrowings from affiliates to support normal operations and temporary capital requirements. We may reduce

our short-term borrowings with cash from operations, long-term borrowings, or, in the case of Ameren Missouri and Ameren Illinois, capital contributions from Ameren (parent). We expect to

make significant capital expenditures over the next five years as

we invest in our electric and natural gas utility infrastructure to support overall system reliability, environmental compliance, and other improvements. We intend to fund those capital

expenditures with available cash on hand, cash generated from

operating activities, commercial paper borrowings and debt

issuances so that we maintain an equity ratio around 50%,

assuming constructive regulatory environments.

The use of cash from operating activities and short-term borrowings to fund capital expenditures and other long-term

investments may periodically result in a working capital deficit, defined as current liabilities exceeding current assets, as was the case at September30, 2016, for Ameren and Ameren Illinois. The working capital deficit as of September30, 2016 , was primarily

the result of current maturities of long-term debt and our decision

to finance our businesses with lower-cost commercial paper

issuances and money pool borrowings. With the credit capacity available under the Credit Agreements and our cash and cash equivalents, the Ameren Companies had access to $1.5 billion of

liquidity at September30, 2016.

50The following table presents net cash provided by (used in) operating, investing, and financing activities for the nine months ended September 30, 2016 and 2015:

Net Cash Provided By (Used In)Operating Activities Net Cash Used InInvesting Activities Net CashProvided by (Used In)Financing Activities20162015Variance20162015Variance20162015Variance Ameren (a) continuing operations$1,559$1,547$12$(1,551)$(1,362)$(189)$(282)$(113)$(169)

Ameren (a) discontinued operations

-(5)5------Ameren Missouri 8881,040(152)(724)(739)15(362)(233)(129)

Ameren Illinois 62754186(679)(615)(64)(16)73(89)(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.Cash Flows from Operating Activities Ameren CorporationAmeren's cash from operating activities associated with continuing operations increased $12 million in the first nine months of 2016, compared with the same period in 2015. The

following items contributed to the increase:* A $42 million insurance receipt at Ameren Missouri related to the Taum Sauk breach. See Note 15 - Commitments and Contingencies under Part II, Item 8, in the Form 10-K for

additional information.

  • A $32 million increase in cash associated with the recovery of Ameren Illinois' IEIMA revenue requirement reconciliation adjustments. The 2014 revenue requirement reconciliation

adjustment, which is being recovered from customers in

2016, was greater than the 2013 revenue requirement

reconciliation adjustment, which was recovered from

customers in 2015.

  • A $30 million decrease in coal inventory at Ameren Missouri, as additional coal was purchased in 2015 to compensate for

delivery disruptions experienced in 2014.* A $25 million decrease in payments for purchased power compared with amounts collected from Ameren Illinois

customers.* A $17 million decrease in expenditures for customer energy efficiency programs compared with amounts collected from

Ameren Illinois customers.* A $15 million increase in cash associated with Ameren Illinois' transmission revenue requirement reconciliation

adjustments, as $7 million was collected from customers in 2016 compared to $8 million refunded to customers in 2015.

  • Income tax refunds of $7 million in 2016, compared with income tax payments of $6 million in 2015. In 2016, Ameren generated net operating losses due to bonus depreciation, resulting in no current federal income tax liability.* A net $8 million decrease in collateral postings with counterparties, primarily at Ameren Missouri, resulting from

changes in the market prices of power and natural gas and

in contracted commodity volumes.The following items partially offset the increase in Ameren's cash from operating activities associated with continuing operations between periods:* A $54 million decrease in net energy costs collected from Ameren Missouri customers under the FAC.* A $36 million increase in payments to purchase stock associated with share-based compensation plan awards.* A $26 million increase in payments for the nuclear refueling and maintenance outage at the Ameren Missouri Callaway energy center. There was no refueling and maintenance

outage in 2015.* An $18 million increase in the cost of natural gas held in storage caused primarily by fewer withdrawals as a result of milder winter temperatures compared with the prior year.* A $16 million increase in interest payments, primarily due to an increase in the cost of Ameren (parent) debt, and an increase in the average outstanding debt at Ameren Illinois.* A $12 million decrease resulting from the change in customer receivable balances, partially offset by an increase

in electric and natural gas margins, as discussed in Results

of Operations, excluding certain noncash items.

  • A $4 million increase in storm restoration costs.Ameren's cash from operating activities associated with discontinued operations was immaterial in both 2016 and 2015.

Ameren MissouriAmeren Missouri's cash from operating activities decreased $152 million in the first nine months of 2016, compared with the same period in 2015. The following items contributed to the

decrease:* A $104 million decrease resulting from a reduction in electric and natural gas margins, as discussed in Results of Operations, excluding certain noncash items, as well as the

change in customer receivable balances.

  • Income tax payments of $11 million to Ameren (parent) pursuant to the tax allocation agreement in 2016, compared

with income tax refunds of $52 million in 2015 primarily

related to an audit settlement.* A $54 million decrease in net energy costs collected from customers under the FAC.* A $26 million increase in payments for nuclear refueling and maintenance outage at the Callaway energy center. There

was no refueling and maintenance outage in 2015.The following items partially offset the decrease in Ameren Missouri's cash from operating activities between periods:

51* A $42 million insurance receipt related to the Taum Sauk breach. See Note 15 - Commitments and Contingencies under Part II, Item 8, in the Form 10-K for additional

information.

  • A $30 million decrease in coal inventory, as additional coal was purchased in 2015 to compensate for delivery

disruptions experienced in 2014.* A net $5 million decrease in collateral postings with counterparties, primarily resulting from changes in the

market prices of power and natural gas and in contracted

commodity volumes.* A $4 million decrease in pension and postretirement benefit plan contributions caused by a change in actuarial

assumptions.

Ameren IllinoisAmeren Illinois' cash from operating activities increased $86 million in the first nine months of 2016, compared with the same period in 2015. The following items contributed to the increase:* A $53 million increase resulting from an increase in electric and natural gas margins, as discussed in Results of Operations, excluding certain noncash items, partially offset

by the change in customer receivable balances.* A $32 million increase in cash associated with the recovery of IEIMA revenue requirement reconciliation adjustments.

The 2014 revenue requirement reconciliation adjustment, which is being recovered from customers in 2016, was

greater than the 2013 revenue requirement reconciliation

adjustment, which was recovered from customers in 2015.

  • A $25 million decrease in payments for purchased power compared with amounts collected from customers.* A $17 million decrease in expenditures for customer energy efficiency programs compared with amounts collected from

customers.* A $15 million increase in cash associated with transmission revenue requirement reconciliation adjustments, as $7 million was collected from customers in 2016 compared to $8 million refunded to customers in 2015.The following items partially offset the increase in Ameren Illinois' cash from operating activities between periods:

  • A $14 million increase in the cost of natural gas held in storage caused primarily by fewer withdrawals as a result of milder winter temperatures compared with the prior year.* An $8 million increase in interest payments, primarily due to an increase in the average outstanding debt, including

senior secured notes issued in December 2015.* A $7 million increase in pension and postretirement benefit plan contributions caused by the timing of payments.* A $4 million increase in storm restoration costs.Cash Flows from Investing ActivitiesAmeren's cash used in investing activities associated with continuing operations increased $189 million in the first nine months of 2016, compared with the same period in 2015. Capital expenditures increased

$164 million principally as a result of the activity at Ameren Illinois, as discussed below, and a $43 million increase in ATXI's capital expenditures, which primarily related to

the Illinois Rivers and Spoon River projects. Ameren Missouri's cash used in investing activities decreased $15 million in the first nine months of 2016, compared with the same period in 2015, due in part to an $85 million decrease in net money pool advances. These items were partially offset by increased capital expenditures of $56 million primarily

related to electric distribution system reliability and energy center projects as well as an $11 million increase in nuclear fuel

expenditures. Ameren Illinois' cash used in investing activities increased $64 million due to an increase in capital expenditures primarily

related to qualified investments in natural gas infrastructure under the QIP rider, smart meter investments made pursuant to IEIMA, and storm restoration costs.

Ameren Missouri continually reviews its generation portfolio and expected power needs. As a result, Ameren Missouri could modify its plan for generation capacity, the type of generation

asset technology that will be employed, and whether capacity or power may be purchased, among other changes. Additionally, we

continually review the reliability of our transmission and

distribution systems, expected capacity needs, and opportunities for transmission investments.The timing and amount of investments could vary because of changes in expected capacity, the condition of transmission and distribution systems, changes

in laws or regulations, and our ability and willingness to pursue transmission investments, among other factors. Any changes in

future generation, transmission, or distribution needs could result

in significant capital expenditures or impairment losses, which

could be material. Compliance with environmental regulations

could also have significant impacts on the level of capital

expenditures. See Note 9 - Commitments and Contingencies in

Part I, Item 1, of this report for additional information.Cash Flows from Financing ActivitiesCash provided by, or used in, financing activities is a result of our financing needs, which depend on the level of cash provided by operating activities, the level of cash used in investing activities, the dividends declared by Ameren's board of

directors, and our long-term debt maturities, among other things.Ameren's cash used in financing activities associated with continuing operations increased $169 million during the first nine months of 2016, compared to the same period in 2015. Short-

term and long-term debt issuances, net of long-term debt repayments, resulted in $137 million less cash provided by financing activities in the first nine months of 2016, compared with the year-ago period. Additionally, there was a $20 million

increase in employee withholding taxes related to share-based

payments in the first nine months of 2016, compared to the same

period in 2015.Ameren Missouri's cash used in financing activities increased $129 million in the first nine months of 2016, compared with the same period in 2015. Cash used in net short-term and 52long-term debt activity was $111 million in 2016, compared with providing cash of $38 million in the year-ago period. Cash paid to

Ameren (parent) as dividends, net of capital contributions

received from parent, decreased $19 million between the two

nine-month periods. Ameren Illinois' financing activities used net cash of $16 million during the first nine months of 2016, compared to providing net cash of $73 million during the same period in 2015. Ameren Illinois paid Ameren (parent) dividends of $95 million, compared with no dividend payments in 2015. Additionally, cash provided by net short-term and long-term debt activity, as well as

money pool borrowings, increased $7 million in 2016, compared

with the year-ago period.

See Long-term Debt and Equity in this section for additional information on maturities and issuances of long-term debt.

Credit Facility Borrowings and LiquidityThe liquidity needs of Ameren, Ameren Missouri, and Ameren Illinois are typically supported through the use of available cash, commercial paper issuances, short-term intercompany borrowings, or drawings under committed credit agreements. See Note 3 - Short-term

Debt and Liquidity under Part I, Item 1, of this report for additional information on credit agreements, short-term borrowing activity , commercial paper issuances, relevant interest rates, and borrowings under Ameren's money pool arrangements.The following table presents Ameren's consolidated liquidity as of September30, 2016:

Ameren and Ameren Missouri:Missouri Credit Agreement (a) borrowing capacity

$1,000 Less: Ameren (parent) commercial paper outstanding 263 Less: Ameren Missouri commercial paper outstanding

-Missouri Credit Agreement - credit available 737 Ameren and Ameren Illinois:Illinois Credit Agreement (a) borrowing capacity 1,100 Less: Ameren (parent) commercial paper outstanding 188 Less: Ameren Illinois commercial paper outstanding 157 Less: Letters of credit 4Illinois Credit Agreement credit available 751 Total Credit Available

$1,488 Cash and cash equivalents 18 Total Liquidity

$1,506(a) Expires in December 2019.The Credit Agreements are used to borrow cash, to issue letters of credit, and to support issuances under Ameren's (parent), Ameren Missouri's, and Ameren Illinois' commercial paper programs. Both of the Credit Agreements are available to Ameren to support issuances under Ameren's commercial paper program, subject to borrowing sublimits. The Missouri Credit Agreement is available to support issuances under Ameren Missouri's commercial paper program. The Illinois Credit Agreement is available to support issuances under Ameren Illinois' commercial paper program. Issuances under the Ameren (parent), Ameren Missouri, and Ameren Illinois commercial paper

programs were available at lower interest rates than the interest rates available under the Credit Agreements.As such, commercial paper issuances were a preferred source of third-

party short-term debt relative to credit facility borrowings. In addition, Ameren Missouri and Ameren Illinois may borrow cash from the utility money pool when funds are available.The rate of interest depends on the composition of internal and external funds in the utility money pool. Ameren Missouri and

Ameren Illinois will access funds from the utility money pool, the Credit Agreements, or the commercial paper programs depending

on which option has the lowest interest rates.The issuance of short-term debt securities by Ameren's utility subsidiaries is subject to approval by the FERC under the Federal Power Act. In February 2016, the FERC issued an order authorizing Ameren Missouri to issue up to $1 billion of short-term debt securities through March 2018. In August 2016, the FERC issued an order authorizing Ameren Illinois to issue up to $1

billion of short-term debt securities through September 2018. The Ameren Companies continually evaluate the adequacy and appropriateness of their liquidity arrangements given

changing business conditions. When business conditions

warrant, changes may be made to existing credit agreements or

to other short-term borrowing arrangements.

53 Long-term Debt and Equity The following table presents the issuances (net of any issuance discounts), maturities, and redemptions of long-term debt for the Ameren Companies for the nine months ended September 30, 2016 and 2015. The Ameren Companies did not issue any common stock during the first nine months of 2016 or 2015. In March 2016 and 2015, Ameren Missouri received cash capital contributions of $38 million and

$224 million, respectively, from Ameren (parent).

Month Issued, Redeemed, or Matured 2016 2015 Issuances of Long-term Debt Ameren Missouri:

3.65% Senior secured notes due 2045 June$149$-3.65% Senior secured notes due 2045 April-249 Total Ameren long-term debt issuances

$149$249 Redemptions and Maturities of Long-term Debt

Ameren Missouri:

5.40% Senior secured notes due 2016 February$260$-4.75% Senior secured notes due 2015 April-114 Ameren Illinois:

6.20% Senior secured notes due 2016 June 54-6.25% Senior secured notes due 2016 June 75-Total Ameren long-term debt redemptions and maturities

$389$114In June 2016, Ameren Missouri issued $150 million of 3.65% senior secured notes due April 15, 2045, with interest payable semiannually on April 15 and October 15 of each year, beginning October 15, 2016. Ameren Missouri received proceeds of $148 million, which were used to repay short-term debt.The Ameren Companies may sell securities registered under their effective registration statements if market conditions and capital requirements warrant such sales. Any offer and sale will

be made only by means of a prospectus that meets the requirements of the Securities Act of 1933 and the rules and regulations thereunder.

Indebtedness Provisions and Other Covenants See Note 3 - Short-term Debt and Liquidity and Note 4 -

Long-term Debt and Equity Financings under Part I, Item1, of this report and Note 4 - Short-term Debt and Liquidity and Note 5

- Long-term Debt and Equity Financings under Part II, Item8, of

the Form 10-K for a discussion of covenants and provisions (and

applicable cross-default provisions) contained in our credit agreements and in certain of the Ameren Companies' indentures

and articles of incorporation.At September30, 2016, the Ameren Companies were in compliance with the provisions and covenants contained in their

credit agreements, indentures, and articles of incorporation.We consider access to short-term and long-term capital markets a significant source of funding for capital requirements

not satisfied by cash generated from our operating activities.

Inability to raise capital on reasonable terms, particularly during times of uncertainty in the capital markets, could negatively affect our ability to maintain and expand our businesses. After assessing its current operating performance, liquidity, and credit ratings (see Credit Ratings below), Ameren, Ameren Missouri, and Ameren Illinois each believes that it will continue to have access to the capital markets. However, events beyond Ameren's, Ameren Missouri's, and Ameren Illinois' control may

create uncertainty in the capital markets or make access to the

capital markets uncertain or limited. Such events could increase our cost of capital and adversely affect our ability to access the

capital markets.

DividendsThe amount and timing of Ameren's common stock dividends are within the sole discretion of Ameren's board of directors. Ameren's board of directors has not set specific targets

or payout parameters when declaring common stock dividends but considers various factors, including Ameren's overall payout

ratio, payout ratios of our peers, projected cash flow and potential future cash flow requirements, historical earnings and cash flow, projected earnings, impacts of regulatory orders or legislation, and other key business considerations. Ameren expects its

dividend payout ratio to be between 55% and 70% of earnings over the next few years. On October 14, 2016, Ameren's board of

directors declared a quarterly common stock dividend of 44 cents

per share payable on December 30, 2016, to shareholders of

record on December 7, 2016, resulting in an annualized equivalent dividend rate of $1.76 per share. The previous

annualized equivalent dividend rate, based on the common stock

dividend declared and paid in the third quarter of 2016, was

$1.70 per share.

See Note 4 - Short-term Debt and Liquidity and Note 5 -

Long-term Debt and Equity Financings under Part II, Item8, of

the Form 10-K for additional discussion of covenants and provisions contained in certain of the Ameren Companies'

financial agreements and articles of incorporation that would restrict the Ameren Companies' payment of dividends in certain 54circumstances. At September30, 2016, none of these circumstances existed at Ameren, Ameren Missouri, or Ameren

Illinois and, as a result, these companies were not restricted from

paying dividends.

The following table presents common stock dividends declared and paid by Ameren Corporation to its common shareholders and by Ameren Missouri and Ameren Illinois to their parent, Ameren Corporation, for the nine months ended September 30, 2016 and 2015:

Nine Months 2016 2015 Ameren Missouri

$285$490 Ameren Illinois 95-Ameren 309 298 Contractual Obligations For a listing of our obligations and commitments, see Other Obligations in Note 9 - Commitments and Contingencies under Part I, Item1, of this report. See Note 11 - Retirement Benefits

under Part I, Item1, of this report for information regarding

expected minimum funding levels for our pension plan.At September30, 2016, total obligations related to commitments for coal, natural gas, nuclear fuel, purchased power, methane gas, equipment, and meter reading services, among other agreements, at Ameren, Ameren Missouri, and Ameren Illinois were $4,328 million, $2,428 million, and $1,859 million, respectively. Off-Balance-Sheet ArrangementsAt September30, 2016, none of the Ameren Companies had off-balance-sheet financing arrangements, other than operating leases entered into in the ordinary course of business, letters of credit, and Ameren parent guarantee arrangements on behalf of its subsidiaries. None of the Ameren Companies expect to engage in any significant off-balance-sheet financing

arrangements in the near future.

Credit RatingsThe credit ratings of the Ameren Companies assigned by Moody's and S&P can affect our liquidity, access to the capital markets and credit markets, cost of borrowing under credit

facilities and commercial paper programs, and collateral posting

requirements under commodity contracts.

The following table presents the principal credit ratings of the Ameren Companies by Moody's and S&P effective on the

date of this report:Moody'sS&P Ameren:

Issuer/corporate credit ratingBaa1BBB+Senior unsecured debtBaa1BBB Commercial paperP-2A-2 Ameren Missouri:

Issuer/corporate credit ratingBaa1BBB+Secured debtA2A Senior unsecured debtBaa1BBB+Commercial paperP-2A-2 Ameren Illinois:

Issuer/corporate credit ratingA3BBB+Secured debtA1A Senior unsecured debtA3BBB+Commercial paperP-2A-2A credit rating is not a recommendation to buy, sell, or hold securities. It should be evaluated independently of any other

rating. Ratings are subject to revision or withdrawal at any time

by the rating organization.

Collateral Postings Any weakening of our credit ratings may reduce access to capital and trigger additional collateral postings and prepayments. Such changes may also increase the cost of borrowing, resulting in an adverse effect on earnings. Cash

collateral postings and prepayments made with external parties, including postings related to exchange-traded contracts, and

cash collateral posted by external parties were immaterial at Ameren, Ameren Missouri, and Ameren Illinois at September30, 2016. A sub-investment-grade issuer or senior unsecured debt rating (whether below "BBB-" from S&P or below "Baa3" from Moody's) at September30, 2016, could have resulted in Ameren, Ameren Missouri, or Ameren Illinois being required to post

additional collateral or other assurances for certain trade

obligations amounting to $106 million, $60 million, and $46 million, respectively.

Changes in commodity prices could trigger additional collateral postings and prepayments. Based on credit ratings at September30, 2016, if market prices were 15% higher or lower than September30, 2016 levels in the next 12 months and 20%

higher or lower thereafter through the end of the term of the commodity contracts, then Ameren, Ameren Missouri, or Ameren

Illinois could be required to post an immaterial amount, compared to each company's liquidity, of collateral or other assurances for

certain trade obligations.

55 OUTLOOKWe seek to earn competitive returns on investments in our businesses. We are seeking to improve our regulatory frameworks and cost recovery mechanisms and simultaneously

pursuing constructive regulatory outcomes within existing frameworks. We are seeking to align our overall spending, both

operating and capital, with economic conditions and with

regulatory frameworks established by our regulators.

Consequently, we are focused on minimizing the gap between allowed and earned returns on equity. We intend to allocate capital resources to our business opportunities that offer the most

attractive risk-adjusted return potential.

Below are some key trends, events, and uncertainties that are reasonably likely to affect our results of operations, financial condition, or liquidity, as well as our ability to achieve strategic

and financial objectives, for 2016 and beyond.

Operations

  • Our strategy for earning competitive returns on our investments involves meeting customer energy needs in an efficient fashion, working to enhance regulatory frameworks, making timely and well-supported rate case filings, and

aligning overall spending with rate case outcomes, economic conditions, and return opportunities.* Ameren continues to pursue its plans to invest in FERC-regulated electric transmission. MISO has approved three electric transmission projects to be developed by ATXI. The

first project, Illinois Rivers, involves the construction of a

transmission line from western Indiana across the state of Illinois to eastern Missouri. The last section of this project is expected to be completed by 2019. The Spoon River project located in northwest Illinois and the Mark Twain project

located in northeast Missouri are the other two MISO-approved projects to be constructed by ATXI. These two projects are expected to be completed in 2018. The Illinois

Rivers and the Spoon River projects have received all of the

necessary commission approvals to authorize their construction. In April 2016, the MoPSC granted ATXI a certificate of convenience and necessity for the Mark Twain project. Before starting construction, ATXI must obtain

assents for road crossings from the five counties where the

line will be constructed. None of the five county commissions approved ATXI's requests for the assents. In October 2016, ATXI filed suit in each of the five county circuit courts to obtain the assents. A decision from each of the county circuit courts is expected in 2017. ATXI is planning to complete the project in 2018; however, delays in obtaining the assents could delay the completion date. The

total investment in all three projects is expected to be more than $1.0 billion from 2016 through 2019. This total includes over $60 million of investment by Ameren Illinois to construct

connections to its existing transmission system. In addition to its investment in the MISO-approved projects, Ameren

Illinois expects to invest $1.9 billion in electric transmission

assets from 2016 through 2020 to address load growth and

reliability requirements.

  • Both Ameren Illinois and ATXI use a forward-looking rate calculation with an annual revenue requirement reconciliation for each company's electric transmission business. With the rates that will become effective on

January 1, 2017, and the currently allowed 10.82% return on common equity, which includes a 50 basis point incentive adder, the 2017 revenue requirement for Ameren Illinois'

electric transmission business would be $258 million, which

represents a $17 million increase over the 2016 revenue

requirement, which was based on a 12.38% return on common equity, primarily due to rate base growth. These

rates reflect a capital structure comprised of 51.6% common

equity and a projected average rate base of $1.4 billion.

With the rates that will become effective on January 1, 2017, and the currently allowed 10.82% return on equity, which includes a 50 basis point incentive adder, the 2017 revenue requirement for ATXI's electric transmission business would

be $171 million, which represents a $31 million increase

over the 2016 revenue requirement, which was based on a 12.38% return on common equity, primarily due to rate base growth as a result of the Illinois Rivers project. These rates

reflect a capital structure comprised of 56.2% common

equity and a projected average rate base of $1.1 billion.

  • The return on common equity was the subject of two FERC complaint proceedings, the November 2013 complaint case

and the February 2015 complaint case, that each challenge

the allowed base return on common equity for MISO transmission owners. In September 2016, the FERC issued

a final order in the November 2013 complaint case which

lowered the allowed base return on common equity to 10.32%. The order was consistent with the initial decision an

administrative law judge issued in December 2015 and

requires customer refunds, with interest, to be issued for the

15-month period ended February 2015. In addition, the new

allowed base return on common equity is reflected in rates prospectively from the September 2016 effective date of the order. Refunds are expected to be issued in the first half of

2017. In June 2016, an administrative law judge issued an

initial decision in the February 2015 complaint case which

would lower the allowed base return on common equity to

9.70% and would require customer refunds, with interest, to be issued for the 15-month period ended May 2016. The

FERC is expected to issue a final order in the February 2015 complaint case in the second quarter of 2017. The

final order in the February 2015 complaint case will

determine the allowed base return on common equity for the 15-month period ended May 2016. The final order in the

February 2015 complaint case will also establish the allowed

base return on common equity that will apply prospectively from its expected second quarter 2017 effective date, replacing the 10.32% allowed base return on common equity, which became effective in September 2016. A 50

basis point reduction in the FERC-allowed base return on common equity would reduce Ameren's and Ameren Illinois'

net income by an estimated $7 million and $4 million, respectively, based on each company's 2017 projected average rate base. Ameren and Ameren Illinois recorded

current regulatory liabilities on their respective September30, 2016 balance sheets, representing their 56 estimate of the expected refunds.

  • On July1, 2016, Ameren Missouri filed a request with the MoPSC seeking approval to increase its annual revenues for electric service by $206 million. The electric rate increase request is based on a 9.9% return on equity, a capital structure comprised of 51.8% equity, a rate base of $7.2 billion, and a test year ended March31, 2016, with certain

pro-forma adjustments through the anticipated true-up date of December31, 2016. As a part of its filing, Ameren

Missouri requested the amortization over ten years of an estimated $81 million of lost fixed cost recovery due to lower sales, as discussed below, to the New Madrid Smelter during the period April 2015 through May 2017. The MoPSC

proceeding relating to the proposed electric service rate changes will take place over a period of up to 11 months, with a decision by the MoPSC expected by late April 2017 and new rates effective in late May 2017. A 50 basis point change in Ameren Missouri's return on common equity would result in an estimated $18 million change in Ameren's and Ameren Missouri's net income, based on Ameren Missouri's current electric rate base.

  • In April 2015, the MoPSC issued an order approving an increase in Ameren Missouri's annual revenues for electric service. The order also approved Ameren Missouri's request for continued use of the FAC; however, it changed the FAC

to exclude all transmission revenues and substantially all transmission charges. This change to Ameren Missouri's FAC is contributing to regulatory lag. For example, the April

2015 MoPSC electric rate order included $29 million of

transmission charges in base rates that were previously included in the FAC. Ameren Missouri expects transmission

charges to increase to $50 million in 2016, with further cost increases expected in the foreseeable future. However, transmission revenues included in base rates in the April

2015 MoPSC electric rate order totaled $34 million and are

expected to remain relatively constant in 2016 and into the near future. In its July 2016 electric rate case, in an effort to

mitigate the regulatory lag resulting from the changes to the FAC in the April 2015 order, Ameren Missouri requested the

implementation of a new tracking mechanism for

transmission charges and revenues.* Ameren Missouri supplies electricity to the New Madrid Smelter. In the first quarter of 2016, operations at the New

Madrid Smelter were suspended. In addition, Noranda filed

voluntary petitions for a court-supervised restructuring process under Chapter 11 of the United States Bankruptcy

Code. In October 2016, Noranda sold the New Madrid Smelter to ARG International AG. As a result of these events

in 2016, actual sales volumes to the New Madrid Smelter

will be significantly below the sales volumes reflected in rates and, therefore, Ameren Missouri has not fully

recovered and will not fully recover its revenue requirement, which included $78 million for sales to the New Madrid Smelter, until rates are adjusted prospectively by the

MoPSC in the July 2016 electric rate case to accurately reflect the smelter's actual sales volumes. Ameren Missouri

estimates a $38 million reduction in 2016 earnings, compared to 2015, relating to the significantly lower

expected electric sales to the New Madrid Smelter after consideration of the FAC-tariff provision that allows Ameren Missouri to retain a portion of its off-system sales. In the first five months of 2017, Ameren Missouri estimates an $8

million reduction in earnings related to the continuation of

significantly lower expected electric sales to the New Madrid Smelter. However, the expected adjustment of rates in May 2017 to accurately reflect the smelter's actual sales volumes

is estimated to result in a $30 million increase in 2017

earnings, compared to 2016 earnings. Operations at the New Madrid Smelter remain suspended and Ameren Missouri is uncertain of future sales to the smelter.

  • In November 2016, the MoPSC approved a $28 million MEEIA 2013 performance incentive based on a revised stipulation agreement between Ameren Missouri, the MoPSC staff, and the MoOPC. As a result, Ameren Missouri

will recognize $9 million of additional revenues in the fourth quarter of 2016 relating to the MEEIA 2013 performance incentive. Further, the revised stipulation agreement

included a provision to incorporate the results of the appeal, discussed below, regarding the determination of an input

used to calculate the performance incentive.

In November 2015, the MoPSC issued an order regarding the

determination of an input used to calculate the performance incentive. Ameren Missouri filed an appeal of the order with the Missouri Court of Appeals, Western District, which is

expected to issue a decision in 2016. If the Missouri Court of Appeals, Western District, overturns the November 2015 MoPSC order, Ameren Missouri may recognize additional

revenues in excess of the $28 million approved by the

MoPSC in November 2016.* The throughput disincentive recovery under MEEIA 2016 replaced the net shared benefits that were collected under MEEIA 2013. Net shared benefits compensated Ameren

Missouri for the current year and longer-term financial impacts of customer energy efficiency programs in each year of the program from 2013 through 2015. The throughput disincentive included in MEEIA 2016, however, is

designed to be earnings neutral each year by compensating

Ameren Missouri for the lost sales volumes from its customer energy efficiency programs that occur in that year, but does not compensate for the longer-term financial

impacts of these programs until sales volumes are lost in a future year. The unfavorable on-going effects of sales volume reductions from the MEEIA 2013 energy efficiency

programs were previously recognized during 2013 through

2015 as net shared benefits, and therefore, any such lost

sales volumes have impacted and will continue to negatively impact Ameren and Ameren Missouri earnings until the date that new rates in the July 2016 rate case become effective

in May 2017.* The IEIMA provides for an annual reconciliation of the revenue requirement necessary to reflect the actual costs

incurred in a given year with the revenue requirement that was reflected in customer rates for that year. Consequently, Ameren Illinois' 2016 electric distribution service revenues

will be based on its 2016 actual recoverable costs, rate

base, and return on common equity as calculated under the

IEIMA's performance-based formula ratemaking framework.

The 2016 revenue requirement is expected to be higher 57 than the 2015 revenue requirement because of an expected increase in recoverable costs and rate base growth. A 50

basis point change in the average monthly yields of the 30-year United States Treasury bonds would result in an estimated $6 million change in Ameren's and Ameren Illinois' net income, based on Ameren Illinois' 2016 projected year-

end rate base.* In December 2015, the ICC issued an order with respect to Ameren Illinois' annual update filing. The ICC approved a

$106 million increase in Ameren Illinois' electric distribution service revenue requirement beginning in January 2016.

These rates have affected and will continue to affect Ameren

Illinois' cash receipts during 2016, but will not be the sole

determinant of its electric distribution service operating

revenues, which will instead be largely determined by the IEIMA's 2016 revenue requirement reconciliation. The 2016

revenue requirement reconciliation, as discussed above, is

expected to result in a regulatory asset that will be collected

from customers in 2018.* In April 2016, Ameren Illinois filed with the ICC its annual electric distribution service formula rate update to establish

the revenue requirement used for 2017 rates. Pending ICC approval, Ameren Illinois' update filing will result in a $14

million decrease in Ameren Illinois' electric distribution service revenue requirement, beginning in January 2017.

This update reflects an increase to the annual formula rate

based on 2015 actual costs and expected net plant

additions for 2016, an increase to include the 2015 revenue

requirement reconciliation adjustment, and a decrease for

the conclusion of the 2014 revenue requirement

reconciliation adjustment, which will be fully collected from customers in 2016. These rates will affect Ameren Illinois'

cash receipts during 2017, but will not be the sole

determinant of its electric distribution service operating

revenues, which will instead be largely determined by the IEIMA's 2017 revenue requirement reconciliation. In October

2016, an administrative law judge issued a proposed order that reflected a decrease to Ameren Illinois' electric distribution service revenue requirement of $14 million. An

ICC decision on the revenue requirement used for 2017

rates is expected by December 2016.

  • As of December 31, 2015, Ameren Missouri's energy

centers that emit CO 2 represented approximately 20% and 35% of Ameren's and Ameren Missouri's rate base, respectively. Ameren and Ameren Missouri estimate their

investments in energy centers that emit CO 2 will represent approximately 15% and 31% of Ameren's and Ameren Missouri's rate base by December 31, 2020.

  • Ameren Missouri's next scheduled refueling and maintenance outage at its Callaway energy center will be in the fall of 2017. During a scheduled outage, which occurs

every 18 months, maintenance expenses increase relative to non-outage years. Additionally, depending on the

availability of its other generation sources and the market prices for power, Ameren Missouri's purchased power costs

may increase and the amount of excess power available for

sale may decrease versus non-outage years. Changes in

purchased power costs and excess power available for sale are included in the FAC, which results in limited impacts to

earnings.* As we continue to experience cost increases and to make infrastructure investments, Ameren Missouri and Ameren

Illinois expect to seek regular electric and natural gas rate

increases and timely cost recovery and tracking mechanisms from their regulators. Ameren Missouri and Ameren Illinois will also seek, as necessary, legislative

solutions to address regulatory lag and to support

investment in their utility infrastructure for the benefit of their customers. Ameren Missouri and Ameren Illinois continue to

face cost recovery pressures including limited economic

growth in their service territories, customer conservation efforts, the impacts of additional customer energy efficiency

programs, increased customer use of innovative and increasingly cost-effective technological advances including

private generation and storage, increased investments and

expected future investments for environmental compliance, system reliability improvements, and new generation capacity, including renewable energy requirements.

Increased investments also result in higher depreciation and

financing costs. Increased costs are also expected from

rising employee benefit costs and higher property and

income taxes, among other costs.

For additional information regarding recent rate orders and related appeals and pending requests filed with state and federal regulatory commissions, see Note 2 - Rate and Regulatory

Matters under Part I, Item 1, of this report and Note 2 - Rate and

Regulatory Matters under Part II, Item 8, of the Form 10-K.

Liquidity and Capital Resources* Through 2020, we expect to make significant capital expenditures to improve our electric and natural gas utility infrastructure with a major portion directed to our transmission and distribution systems. We estimate that we will invest in total up to $11.5 billion (Ameren Missouri - up to $4.3 billion; Ameren Illinois - up to $6.2 billion; ATXI- up

to $1.0 billion) during 2016 through 2020.

  • Environmental regulations, including those related to CO 2 emissions, or other actions taken by the EPA could result in

significant increases in capital expenditures and operating costs. These costs could be prohibitive, which could result in the closure of some of Ameren Missouri's coal-fired energy centers. Ameren Missouri's capital expenditures are

subject to MoPSC prudence reviews, which could result in cost disallowances as well as regulatory lag. The cost of Ameren Illinois' purchased power and gas purchased for resale could increase. However, Ameren Illinois expects

these costs would be recovered from customers with no material adverse effect on its results of operations, financial position, or liquidity. Ameren's and Ameren Missouri's

earnings could benefit from increased investment to comply

with environmental regulations if those investments are

reflected and recovered on a timely basis in rates charged

to customers.

  • Ameren continues to evaluate the Clean Power Plan's potential impacts to its operations, including those related to 58electric system reliability, and its level of investment in customer energy efficiency programs, renewable energy, and other forms of generation investment. In February 2016, the United States Supreme Court stayed the Clean Power

Plan and all implementation requirements until the legal

appeals are concluded. If the rule is ultimately upheld and implemented in substantially its current form, Ameren

Missouri expects to incur increased net fuel and operating

costs, and make new or accelerated capital expenditures, in

addition to the costs of making modifications to existing

operations in order to achieve compliance. Compliance

measures could result in the closure or alteration of the operation of some of Ameren Missouri's coal and natural-

gas-fired energy centers, which could result in increased

operating costs.* Ameren Missouri files a nonbinding integrated resource plan with the MoPSC every three years. Ameren Missouri's

integrated resource plan filed with the MoPSC in October

2014, prior to the issuance of the Clean Power Plan, was a

20-year plan that supported a more fuel-diverse energy portfolio in Missouri, including coal, solar, wind, natural gas, and nuclear power. The plan involves expanding renewable

generation, retiring coal-fired generation as energy centers

reach the end of their useful lives, continuation and expansion of the then-existing energy efficiency programs, and adding natural gas-fired combined cycle generation.* The Ameren Companies have multiyear credit agreements that cumulatively provide $2.1 billion of credit through

December 2019, subject to a 364-day repayment term in the case of Ameren Missouri and Ameren Illinois. See Note 3 -

Short-term Debt and Liquidity under Part I, Item 1, of this

report for additional information regarding the Credit Agreements. Ameren, Ameren Missouri, and Ameren Illinois

believe that their liquidity is adequate given their expected

operating cash flows, capital expenditures, and related financing plans. However, there can be no assurance that

significant changes in economic conditions, disruptions in

the capital and credit markets, or other unforeseen events will not materially affect their ability to execute their

expected operating, capital, or financing plans.* In December 2015, a federal tax law was enacted that authorized the continued use of bonus depreciation that

allows for an acceleration of deductions for tax purposes at a rate of 50% for 2015, 2016, and 2017. The rate will be

reduced to 40% in 2018 and then to 30% in 2019. Bonus

depreciation will be phased out in 2020 unless a new law is

enacted. Bonus depreciation is expected to reduce or

eliminate federal income tax payments through at least 2020. Ameren expects to use this incremental cash flow to

make capital investments in utility infrastructure for the

benefit of its customers. Without these investments, bonus

depreciation would reduce rate base, which reduces our revenue requirements and future earnings growth. The impact of bonus depreciation on Ameren Missouri, Ameren Illinois, and ATXI will vary based on investment levels at each company.* As of September30, 2016, Ameren had $511 million in tax benefits from federal and state net operating loss carryforwards (Ameren Missouri - $39 million and Ameren Illinois - $132 million) and $135 million in federal and state

income tax credit carryforwards (Ameren Missouri - $28 million and Ameren Illinois - $1 million). In addition, Ameren

has $37 million of expected state income tax refunds and

state overpayments. Consistent with the tax allocation agreement between Ameren and its subsidiaries, these carryforwards are expected to partially offset income tax liabilities for Ameren Missouri until 2019 and Ameren Illinois until 2018. Ameren does not expect to make material federal income tax payments until 2021. These tax benefits, primarily at the Ameren (parent) level, when realized, would be available to support funding ATXI transmission

investments.* Ameren expects its cash used for capital expenditures and dividends to exceed cash provided by operating activities over the next several years. Ameren expects to use debt to

fund such cash shortfalls; it does not currently expect to

issue equity over the next several years.

The above items could have a material impact on our results of operations, financial position, or liquidity. Additionally, in the

ordinary course of business, we evaluate strategies to enhance our results of operations, financial position, or liquidity. These

strategies may include acquisitions, divestitures, opportunities to

reduce costs or increase revenues, and other strategic initiatives to increase Ameren's shareholder value. We are unable to predict which, if any, of these initiatives will be executed. The execution

of these initiatives may have a material impact on our future results of operations, financial position, or liquidity.REGULATORY MATTERS See Note 2 - Rate and Regulatory Matters under Part I, Item 1, of this report.ITEM3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

Market risk is the risk of changes in value of a physical asset or a financial instrument, derivative or nonderivative, caused by

fluctuations in market variables such as interest rates, commodity prices, and equity security prices. A derivative is a contract whose

value is dependent on, or derived from, the value of some underlying asset or index. The following discussion of our risk

management activities includes forward-looking statements that involve risks and uncertainties. Actual results could differ

materially from those projected in the forward-looking statements.

We handle market risk in accordance with established policies, which may include entering into various derivative transactions.

In the normal course of business, we also face risks that are

either nonfinancial or nonquantifiable. Such risks, principally

business, legal, and operational risks, are not part of the following

discussion.

Our risk management objectives are to optimize our physical generating assets and to pursue market opportunities within

prudent risk parameters. Our risk management policies are set by

a risk management steering committee, which is composed of senior-level Ameren officers, with Ameren board of directors

oversight.

59 There have been no material changes to the quantitative and qualitative disclosures about interest rate risk, credit risk, equity price risk, commodity price risk, and commodity supplier

risk included in the Form 10-K. Regarding commodity supplier risk, in April 2016, Ameren Missouri's primary supplier of ultra-low

sulfur coal announced that it had filed a voluntary petition for restructuring under Chapter 11 of the United States Bankruptcy Code. At this time, Ameren and Ameren Missouri believe the restructuring proceeding will not affect the supplier's performance under the terms of its existing contracts with Ameren Missouri and therefore do not expect any material impact to Ameren Missouri's operations as a result of this restructuring proceeding.

See Item7A under Part II of the Form 10-K for a more detailed

discussion of our market risk.Fair Value of ContractsWe use derivatives principally to manage the risk of changes in market prices for natural gas, power, and uranium, as well as the risk of changes in rail transportation surcharges through fuel oil hedges. The following table presents the favorable (unfavorable) changes in the fair value of all derivative contracts marked-to-market during the three and nine months ended September 30, 2016. We use various methods to

determine the fair value of our contracts. In accordance with authoritative accounting guidance for fair value hierarchy levels, the sources we

used to determine the fair value of these contracts were active quotes (Level 1), inputs corroborated by market data (Level 2), and other modeling and valuation methods that are not corroborated by market data (Level 3). See Note 7 - Fair Value Measurements under Part I, Item1, of this report for additional information regarding the methods used to determine the fair value of these contracts.

Three Months Nine Months Ameren Missouri AmerenIllinoisAmeren Ameren Missouri AmerenIllinoisAmeren Fair value of contracts at beginning of period, net$(12)$(181)$(193)$(27)$(219)$(246)

Contracts realized or otherwise settled during the period 2 7 9 8 35 43 Fair value of new contracts entered into during the period

-(1)(1)9 (1)8 Other changes in fair value(3)(12)(15)

(3)(2)(5)Fair value of contracts outstanding at end of period, net$(13)$(187)$(200)$(13)$(187)$(200)The following table presents maturities of derivative contracts as of September30, 2016, based on the hierarchy levels used to determine the fair value of the contracts:

Sources of Fair Value Maturity Lessthan1 Year Maturity1-3Years Maturity3-5Years Maturityin Excessof5 YearsTotalFairValue Ameren Missouri:

Level 1$(8)$(1)$-$-$(9)Level 2 (a)(3)(6)--(9)Level 3 (b)7 (2)--5 Total$(4)$(9)$-$-$(13)Ameren Illinois:

Level 1$-$-$-$-$-Level 2 (a)(7)(8)--(15)Level 3 (b)(12)(26)(27)(107)(172)Total$(19)$(34)$(27)$(107)$(187)

Ameren:

Level 1$(8)$(1)$-$-$(9)Level 2 (a)(10)(14)--(24)Level 3 (b)(5)(28)(27)(107)(167)Total$(23)$(43)$(27)$(107)$(200)(a) Principally fixed-price vs. floating over-the-counter power swaps, power forwards, and fixed-price vs. floating over-the-counter natural gas swaps.(b) Principally power forward contract values based on information from external sources, historical results, and our estimates. Level 3 also includes option contract values based on an option valuation model.ITEM4. CONTROLS AND PROCEDURES.(a) Evaluation of Disclosure Controls and ProceduresAs of September30, 2016, evaluations were performed under the supervision and with the participation of management, including the principal executive officer and principal financial officer of each of the Ameren Companies, of the effectiveness of the design and operation of such registrant's disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act). Based on those 60evaluations, as of September30, 2016, the principal executive officer and the principal financial officer of each of the Ameren Companies concluded that such disclosure controls and procedures are effective to provide assurance that information required to be disclosed in such registrant's reports filed or submitted under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC's rules and forms and such information is accumulated and communicated to its management, including its principal executive and its principal financial officers, to allow timely decisions regarding required disclosure.(b) Changes in Internal Controls over Financial ReportingThere has been no change in any of the Ameren Companies' internal control over financial reporting during their most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, each of their internal control over financial reporting.PART II. OTHER INFORMATIONITEM1. LEGAL PROCEEDINGS.We are involved in legal and administrative proceedings before various courts and agencies with respect to matters that arise in the ordinary course of business, some of which involve substantial amounts of money. We believe that the final disposition of these proceedings, except as otherwise disclosed in this report, will not have a material adverse effect on our results of operations, financial position, or liquidity.

Risk of loss is mitigated, in some cases, by insurance or contractual or statutory indemnification. Material legal and administrative

proceedings, which are discussed in Note 2 - Rate and Regulatory Matters, Note 9 - Commitments and Contingencies, and Note 10 -

Callaway Energy Center, under Part I, Item1, of this report include the following:* Ameren Missouri's electric rate case filed with the MoPSC in July 2016;* Ameren Missouri's appeal to the Missouri Court of Appeals, Western District, regarding the calculation of the MEEIA 2013 performance incentive;* Ameren Illinois' annual electric distribution service formula rate update filed with the ICC in April 2016;

  • ATXI's lawsuits filed in October 2016 in the circuit courts of each of Adair, Knox, Marion, Schuyler, and Shelby counties in Missouri to obtain assents for road crossings in the counties where the Mark Twain transmission project will be constructed;
  • the February 2015 complaint case filed with the FERC seeking a reduction in the allowed base return on common equity under the MISO tariff;* the EPA's Clean Air Act-related litigation against Ameren Missouri;
  • remediation matters associated with former MGP and waste disposal sites of the Ameren Companies; and
  • the class action lawsuit against Ameren Missouri relating to municipal taxes.ITEM1A. RISK FACTORS.

There have been no material changes to the risk factors disclosed in Part I, Item 1A, Risk Factors in the Form 10-K.ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS.Ameren, Ameren Missouri, and Ameren Illinois did not purchase equity securities reportable under Item703 of Regulation S-K during the period from July 1, 2016 to September30, 2016.

61 ITEM6. EXHIBITS. The documents listed below are being filed or have previously been filed on behalf of the Ameren Companies and are incorporated herein by reference from the documents indicated and made a part hereof. Exhibits not identified as previously filed are filed herewith.

ExhibitDesignationRegistrant(s)

Nature of Exhibit Previously Filed as Exhibit to:

Statement re: Computation of Ratios 12.1 Ameren Ameren's Statement of Computation of Ratio of Earnings to Fixed Charges 12.2 Ameren Missouri Ameren Missouri's Statement of Computation of Ratio of Earnings to Fixed

Charges and Combined Fixed Charges and Preferred Stock Dividend

Requirements 12.3 Ameren Illinois Ameren Illinois' Statement of Computation of Ratio of Earnings to Fixed Charges

and Combined Fixed Charges and Preferred Stock Dividend Requirements Rule 13a-14(a) / 15d-14(a) Certifications 31.1 Ameren Rule 13a-14(a)/15d-14(a) Certification of Principal Executive Officer of Ameren 31.2 Ameren Rule 13a-14(a)/15d-14(a) Certification of Principal Financial Officer of Ameren 31.3 Ameren Missouri Rule 13a-14(a)/15d-14(a) Certification of Principal Executive Officer of Ameren

Missouri 31.4 Ameren Missouri Rule 13a-14(a)/15d-14(a) Certification of Principal Financial Officer of Ameren

Missouri 31.5 Ameren Illinois Rule 13a-14(a)/15d-14(a) Certification of Principal Executive Officer of Ameren

Illinois 31.6 Ameren Illinois Rule 13a-14(a)/15d-14(a) Certification of Principal Financial Officer of Ameren

Illinois Section 1350 Certifications 32.1 Ameren Section 1350 Certification of Principal Executive Officer and Principal Financial Officer of Ameren 32.2 Ameren Missouri Section 1350 Certification of Principal Executive Officer and Principal Financial

Officer of Ameren Missouri 32.3 Ameren Illinois Section 1350 Certification of Principal Executive Officer and Principal Financial

Officer of Ameren Illinois Interactive Data Files101.INSAmeren Companies XBRL Instance Document101.SCHAmeren Companies XBRL Taxonomy Extension Schema Document101.CALAmeren Companies XBRL Taxonomy Extension Calculation Linkbase Document101.LABAmeren Companies XBRL Taxonomy Extension Label Linkbase Document101.PREAmeren Companies XBRL Taxonomy Extension Presentation Linkbase Document101.DEFAmeren Companies XBRL Taxonomy Extension Definition DocumentThe file number references for the Ameren Companies' filings with the SEC are: Ameren, 1-14756; Ameren Missouri, 1-2967; and Ameren Illinois, 1-3672.

Each registrant hereby undertakes to furnish to the SEC upon request a copy of any long-term debt instrument not listed above that such registrant has not filed as an exhibit pursuant to the exemption provided by Item601(b)(4)(iii)(A) of Regulation S-K.

62SIGNATURESPursuant to the requirements of the Exchange Act, each registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. The signature for each undersigned company shall be deemed to relate only to matters having reference to such company or its subsidiaries.AMEREN CORPORATION (Registrant)

/s/ Martin J. Lyons, Jr.Martin J. Lyons, Jr.Executive Vice President and Chief Financial Officer (Principal Financial Officer)UNION ELECTRIC COMPANY (Registrant)

/s/ Martin J. Lyons, Jr.Martin J. Lyons, Jr.Executive Vice President and Chief Financial Officer (Principal Financial Officer)AMEREN ILLINOIS COMPANY (Registrant)

/s/ Martin J. Lyons, Jr.Martin J. Lyons, Jr.Executive Vice President and Chief Financial Officer (Principal Financial Officer)

Date: November 4, 2016 Exhibit 12.1 Ameren Corporation Computation of Ratio of Earnings to Fixed Charges (Thousands of Dollars, Except Ratio)

Nine Months Ended September 30, 2016 Earnings available for fixed charges, as defined:

Net income from continuing operations attributable to Ameren Corporation$620,681 Loss from equity investee 4,306 Tax expense based on income 355,386 Fixed charges excluding subsidiary preferred stock dividends tax adjustment 310,698 Earnings available for fixed charges, as defined$1,291,071 Fixed charges, as defined:

Interest expense on short-term and long-term debt$281,935 Estimated interest cost within rental expense 7,090 Amortization of net debt premium, discount, and expenses 16,841 Subsidiary preferred stock dividends 4,832 Adjust subsidiary preferred stock dividends to pretax basis 3,025 Total fixed charges, as defined$313,723 Consolidated ratio of earnings to fixed charges 4.12 Exhibit 12.2 Union Electric Company Computation of Ratio of Earnings to Fixed Charges and Combined Fixed Charges and Preferred Stock Dividend Requirements (Thousands of Dollars, Except Ratios)

Nine Months Ended September 30, 2016 Earnings available for fixed charges, as defined:

Net income

$349,823 Tax expense based on income 214,731 Fixed charges 170,480 Earnings available for fixed charges, as defined

$735,034 Fixed charges, as defined:

Interest expense on short-term and long-term debt

$162,408 Estimated interest cost within rental expense 3,502 Amortization of net debt premium, discount, and expenses 4,570 Total fixed charges, as defined

$170,480 Ratio of earnings to fixed charges 4.31 Earnings required for combined fixed charges and preferred stock dividends:

Preferred stock dividends

$2,565 Adjustment to pretax basis 1,575$4,140 Combined fixed charges and preferred stock dividend requirements

$174,620 Ratio of earnings to combined fixed charges and preferred stock dividend requirements 4.21 Exhibit 12.3 Ameren Illinois Company Computation of Ratio of Earnings to Fixed Charges and Combined Fixed Charges and Preferred Stock Dividend Requirements (Thousands of Dollars, Except Ratios)

Nine Months Ended September 30, 2016 Earnings available for fixed charges, as defined:

Net income$225,058 Tax expense based on income 143,917 Fixed charges 111,793 Earnings available for fixed charges, as defined$480,768 Fixed charges, as defined:

Interest expense on short-term and long-term debt$97,504 Estimated interest cost within rental expense 3,588 Amortization of net debt premium, discount, and expenses 10,701 Total fixed charges, as defined$111,793 Ratio of earnings to fixed charges 4.30 Earnings required for combined fixed charges and preferred stock dividends:

Preferred stock dividends

$2,267 Adjustment to pretax basis 1,450$3,717 Combined fixed charges and preferred stock dividend requirements$115,510 Ratio of earnings to combined fixed charges and preferred stock dividend requirements 4.16 Exhibit 31.1RULE 13a-14(a)/15d-14(a) CERTIFICATIONOF PRINCIPAL EXECUTIVE OFFICER OF AMEREN CORPORATION(required by Section 302 of the Sarbanes-Oxley Act of 2002) I, Warner L. Baxter, certify that: 1. I have reviewed this report on Form 10-Q for the quarterly period ended September 30, 2016 of Ameren Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not

misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the

periods presented in this report; 4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its

consolidated subsidiaries, is made known to us by others within those entities, particularly during the period

in which this report is being prepared;b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of

financial reporting and the preparation of financial statements for external purposes in accordance with

generally accepted accounting principles;c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the

period covered by this report based on such evaluation; andd) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control

over financial reporting; and 5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or

persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; andb) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 4, 2016

/s/ Warner L. BaxterWarner L. BaxterChairman, President and Chief Executive Officer (Principal Executive Officer)

Exhibit 31.2RULE 13a-14(a)/15d-14(a) CERTIFICATIONOF PRINCIPAL FINANCIAL OFFICER OF AMEREN CORPORATION(required by Section 302 of the Sarbanes-Oxley Act of 2002) I, Martin J. Lyons, Jr., certify that: 1. I have reviewed this report on Form 10-Q for the quarterly period ended September 30, 2016 of Ameren Corporation; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not

misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the

periods presented in this report; 4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its

consolidated subsidiaries, is made known to us by others within those entities, particularly during the period

in which this report is being prepared;b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of

financial reporting and the preparation of financial statements for external purposes in accordance with

generally accepted accounting principles;c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the

period covered by this report based on such evaluation; andd) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control

over financial reporting; and 5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or

persons performing the equivalent functions):a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; andb) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 4, 2016

/s/ Martin J. Lyons, Jr.Martin J. Lyons, Jr.Executive Vice President and Chief Financial Officer (Principal Financial Officer)

Exhibit 31.3RULE 13a-14(a)/15d-14(a) CERTIFICATIONOF PRINCIPAL EXECUTIVE OFFICER OF UNION ELECTRIC COMPANY (required by Section 302 of the Sarbanes-Oxley Act of 2002) I, Michael L. Moehn, certify that: 1. I have reviewed this report on Form 10-Q for the quarterly period ended September 30, 2016 of UnionElectric Company; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not

misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the

periods presented in this report; 4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its

consolidated subsidiaries, is made known to us by others within those entities, particularly during the period

in which this report is being prepared;b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of

financial reporting and the preparation of financial statements for external purposes in accordance with

generally accepted accounting principles;c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the

period covered by this report based on such evaluation; andd) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control

over financial reporting; and 5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or

persons performing the equivalent functions):a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; andb) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 4, 2016

/s/ Michael L. Moehn Michael L. Moehn Chairman and President (Principal Executive Officer)

Exhibit 31.4RULE 13a-14(a)/15d-14(a) CERTIFICATIONOF PRINCIPAL FINANCIAL OFFICER OF UNION ELECTRIC COMPANY (required by Section 302 of the Sarbanes-Oxley Act of 2002) I, Martin J. Lyons, Jr., certify that: 1. I have reviewed this report on Form 10-Q for the quarterly period ended September 30, 2016 of UnionElectric Company; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not

misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the

periods presented in this report; 4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its

consolidated subsidiaries, is made known to us by others within those entities, particularly during the period

in which this report is being prepared;b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of

financial reporting and the preparation of financial statements for external purposes in accordance with

generally accepted accounting principles;c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the

period covered by this report based on such evaluation; andd) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control

over financial reporting; and 5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or

persons performing the equivalent functions):a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; andb) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 4, 2016

/s/ Martin J. Lyons, Jr.Martin J. Lyons, Jr.Executive Vice President and Chief Financial Officer (Principal Financial Officer)

Exhibit 31.5RULE 13a-14(a)/15d-14(a) CERTIFICATIONOF PRINCIPAL EXECUTIVE OFFICER OF AMEREN ILLINOIS COMPANY (required by Section 302 of the Sarbanes-Oxley Act of 2002) I, Richard J. Mark, certify that: 1. I have reviewed this report on Form 10-Q for the quarterly period ended September 30, 2016 of Ameren Illinois Company; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not

misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the

periods presented in this report; 4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its

consolidated subsidiaries, is made known to us by others within those entities, particularly during the period

in which this report is being prepared;b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of

financial reporting and the preparation of financial statements for external purposes in accordance with

generally accepted accounting principles;c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the

period covered by this report based on such evaluation; andd) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control

over financial reporting; and 5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or

persons performing the equivalent functions):a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; andb) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 4, 2016

/s/ Richard J. Mark Richard J. Mark Chairman and President (Principal Executive Officer)

Exhibit 31.6RULE 13a-14(a)/15d-14(a) CERTIFICATIONOF PRINCIPAL FINANCIAL OFFICER OF AMEREN ILLINOIS COMPANY (required by Section 302 of the Sarbanes-Oxley Act of 2002) I, Martin J. Lyons, Jr., certify that: 1. I have reviewed this report on Form 10-Q for the quarterly period ended September 30, 2016 of Ameren Illinois Company; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not

misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the

periods presented in this report; 4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its

consolidated subsidiaries, is made known to us by others within those entities, particularly during the period

in which this report is being prepared;b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of

financial reporting and the preparation of financial statements for external purposes in accordance with

generally accepted accounting principles;c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the

period covered by this report based on such evaluation; andd) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control

over financial reporting; and 5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or

persons performing the equivalent functions):a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; andb) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 4, 2016

/s/ Martin J. Lyons, Jr.Martin J. Lyons, Jr.Executive Vice President and Chief Financial Officer (Principal Financial Officer)

Exhibit 32.1SECTION 1350 CERTIFICATION OF THE PRINCIPAL EXECUTIVE OFFICER AND THE PRINCIPAL FINANCIAL OFFICER OFAMEREN CORPORATION (required by Section 906 of the Sarbanes-Oxley Act of 2002)In connection with the report on Form 10-Q for the quarterly period ended September 30, 2016 of AmerenCorporation (the"Registrant") as filed by the Registrant with the Securities and Exchange Commission onthe date hereof (the "Form 10-Q"), each undersigned officer of the Registrant does hereby certify, pursuant to 18U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:(1) The Form 10-Q fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15U.S.C. 78m or 78o(d)); and(2) The information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date: November 4, 2016

/s/ Warner L. BaxterWarner L. BaxterChairman, President and Chief Executive Officer (Principal Executive Officer)

/s/ Martin J. Lyons, Jr.Martin J. Lyons, Jr.Executive Vice President and Chief Financial Officer (Principal Financial Officer)

Exhibit 32.2SECTION 1350 CERTIFICATION OF THE PRINCIPAL EXECUTIVE OFFICERAND THE PRINCIPAL FINANCIAL OFFICER OFUNION ELECTRIC COMPANY (required by Section 906 of the Sarbanes-Oxley Act of 2002)

In connection with the report on Form 10-Q for the quarterly period ended September 30, 2016 of UnionElectric Company (the "Registrant") as filed by the Registrant with the Securities and Exchange Commissiononthe date hereof (the "Form 10-Q"), each undersigned officer of the Registrant does hereby certify, pursuant to 18U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:(1) The Form 10-Q fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15U.S.C. 78m or 78o(d)); and(2) The information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date: November 4, 2016

/s/ Michael L. Moehn Michael L. Moehn Chairman and President (Principal Executive Officer)

/s/ Martin J. Lyons, Jr.Martin J. Lyons, Jr.Executive Vice President and Chief Financial Officer (Principal Financial Officer)

Exhibit 32.3SECTION 1350 CERTIFICATION OF THE PRINCIPAL EXECUTIVE OFFICERAND THE PRINCIPAL FINANCIAL OFFICER OFAMEREN ILLINOIS COMPANY (required by Section 906 of the Sarbanes-Oxley Act of 2002)In connection with the report on Form 10-Q for the quarterly period ended September 30, 2016 of Ameren Illinois Company (the "Registrant") as filed by the Registrant with the Securities and Exchange Commission onthe date hereof (the "Form 10-Q"), each undersigned officer of the Registrant does herebycertify, pursuant to 18U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that:(1) The Form 10-Q fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15U.S.C. 78m or 78o(d)); and(2) The information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date: November 4, 2016

/s/ Richard J. Mark Richard J. Mark Chairman and President (Principal Executive Officer)

/s/ Martin J. Lyons, Jr.Martin J. Lyons, Jr.Executive Vice President and Chief Financial Officer (Principal Financial Officer)