ML021090036

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2 of 2, Nuclear Management Co., LLC, Kewaunee Nuclear Power Plant, 2001 Annual Financial Report for Alliant Energy Corp, Managements Discussion and Analysis of Financial Condition and Result of Operations
ML021090036
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Site: Kewaunee Dominion icon.png
Issue date: 04/11/2002
From: Coutu T
Nuclear Management Co
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Document Control Desk, Office of Nuclear Reactor Regulation
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Download: ML021090036 (58)


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Management's Discussion and Analysis of Financial Condition and Results of Operations A listing of abbreviations and acronyms used in the text and notes of this report is on page 81.

Forward-Looking Statements Statements contained in this report (including Management's Discussion and Analysis of Financial Condition and Results of Operations (MD&A)) that are not of historical fact are forward looking statements intended to qualify for the safe harbors from liability established by the Private Securities Litigation Reform Act of 1995. Such forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially from those expressed in, or implied by, such statements. Some, but not all, of the risks and uncertainties include: factors listed in "Other Matters - Other Future Considerations;" weather effects on sales and revenues; general economic and political conditions in Alliant Energy's domestic service territories; federal, state and international regulatory or governmental actions, including issues associated with the deregulation of the domestic utility industry and the ability to obtain adequate and timely rate relief; unanticipated construction and acquisition expenditures; issues related to stranded costs and the recovery thereof; unanticipated issues related to the supply of purchased electricity and price thereof; unexpected issues related to the operations of Alliant Energy's nuclear facilities; unanticipated costs associated with certain environmental remediation efforts being undertaken by Alliant Energy and with environmental compliance generally; unanticipated developments that adversely impact Alliant Energy's strategy to grow its non-regulated businesses; Alliant Energy's ability to identify and successfully complete acquisitions and development projects; improved profitability of Alliant Energy's Brazil investments, as well as continued growth in earnings from its China investments; continued strong earnings from Whiting, including the recovery and stability of oil and gas prices; continued improved profitability of Alliant Energy's other non-regulated businesses as a whole, including the Integrated Services and Generation and Trading business units; no material permanent declines in the fair market value of, or expected cash flows from, Alliant Energy's investments; technological developments; employee workforce factors, including changes in key executives, collective bargaining agreements or work stoppages; political, legal, economic and exchange rate conditions in foreign countries Alliant Energy has investments in; and changes in the rate of inflation. Alliant Energy assumes no obligation, and disclaims any duty, to update the forward-looking statements in this report.

Utility Industry Review Overview - Alliant Energy has two primary utility subsidiaries, IP&L and WP&L. IP&L was formed as a result of the merger of IPC with and into IESU effective January 1, 2002. WP&L has one utility subsidiary, South Beloit.

As a public utility holding company with significant utility assets, Alliant Energy competes in an ever-changing utility industry. Electric energy generation, transmission and distribution are in a period of fundamental change resulting from legislative, regulatory, economic and technological changes. These changes impact competition in the electric wholesale and retail markets as customers of electric utilities are being offered alternative suppliers. Such competitive pressures could result in electric utilities losing customers and incurring stranded costs (i.e., assets and other costs rendered unrecoverable as the result of competitive pricing) which would be borne by security holders if the costs cannot be recovered from customers.

Alliant Energy's utility subsidiaries are currently subject to regulation by FERC, and state regulation in Iowa, Wisconsin, Minnesota and Illinois. FERC regulates competition in the electric wholesale power generation market and each state regulates whether to permit retail competition, the terms of such retail competition and the recovery of any portion of stranded costs that are ultimately determined to have resulted from retail competition. Alliant Energy cannot predict the timing of a restructured electric industry or the impact on its financial condition or results of operations but does believe it is well-positioned to compete in a deregulated competitive market. Although Alliant Energy ultimately believes that the electric industry will be deregulated, the pace of deregulation in its primary retail electric service territories has been delayed due to events related to Enron and California's restructured electric utility industry.

WP&L, including South Beloit, transferred its transmission assets with no gain or loss (approximate net book value of

$186 million) to ATC on January 1, 2001. WP&L received a tax-free cash distribution of $75 million from ATC and had a

$110 million equity investment in ATC, with an ownership percentage of approximately 26.5 percent at December 31, 2001. This transfer has not resulted in a significant impact on WP&L's financial condition or results of operations since FERC allows ATC to earn a return on the contributed assets comparable to the return formerly allowed WP&L by the PSCW and FERC. During 2001, ATC returned approximately 80 percent of its earnings to the equity holders and, although no assurance can be given, Alliant Energy anticipates ATC will continue with this policy in the future. ATC realizes its revenues from the provision of transmission services to both participants in ATC as well as non-participants. ATC is a transmission-owning member of the Midwest ISO and the MAIN Regional Reliability Council.

AL[IANT ENERGY 2001 ANNUAL REPORT 29

Management's Discussion and Analysis of Financial Condition and Results of Operations (continued)

In September 2001, six electric utility companies, including IESU and IPC, filed an application with FERC to create TRANSLink, a for-profit, transmission-only company. A ruling is expected from FERC in the second quarter of 2002. The participants have requested that FERC expedite consideration of the application so that TRANSLink could commence operations in January 2003. Current plans call for IP&L to contribute its transmission assets, which have an estimated net book value of approximately $317 million, to TRANSLink in exchange for a corresponding ownership interest in TRANSLink. The TRANSLink proposal is subject to receipt of all required federal and state regulatory approvals.

Alliant Energy complied with provisions of a FERC order requiring utilities to voluntarily turn over operational control of their transmission systems to a regional entity by the end of 2001 by WP&L's transfer of its transmission assets to ATC and the participation of lIESU, WP&L and IPC in the Midwest ISO, which was given Regional Transmission Organization (RTO) status in December 2001. The Midwest ISO began offering transmission service in the first quarter of 2002 and IP&L and WP&L now receive all of their transmission services from the Midwest ISO.

Rates and Regulatory Matters Overview - As part of its merger approval, FERC accepted a proposal by Alliant Energy's utility subsidiaries which provides for a four-year freeze on wholesale electric prices beginning with the effective date of the April 1998 merger forming Alliant Energy. Each of the utilities also agreed with their respective state commissions to provide customers a four-year retail electric and gas price freeze (the ICC granted IPC and South Beloit a three-year price freeze), with certain exceptions, which commenced on the effective date of the April 1998 merger. As a result, the last of the price freezes impacting Alliant Energy's utility subsidiaries will expire in April 2002.

WP&L - In 2000, the NRC issued expanded performance measures which raised several areas of concern with Kewaunee's operations. Kewaunee is a nuclear facility in which WP&L has a 41 percent ownership interest. Addressing the NRC's concerns and ensuring that Kewaunee operates in accordance with current industry and regulatory standards resulted in additional operating costs to WP&L in 2001 of approximately $8 million and WP&L is expected to incur an additional $21 million of incremental costs in 2002 through 2005. In April 2001, the PSCW approved the deferral of such incremental costs incurred after March 27, 2001 (WP&L has deferred $5.5 million of such costs at December 31, 2001). In July 2001, WP&L requested a one-time $19 million retail electric rate increase from the PSCW to recover a portion of the costs associated with the increased Kewaunee operating costs and costs associated with the replacement of the steam generators at Kewaunee. WP&L expects that the remainder of the additional operating costs related to Kewaunee will be recovered through future base rate filings with the PSCW.

In August 2001, WP&L filed a $114 million base rate increase request with the PSCW related to its investments in reliability, customer service, technology and environmental upgrades, as well as investments in its infrastructure. In September 2001, WP&L filed a request with the PSCW to consolidate the $19 million request for increased Kewaunee operating costs with the new base rate increase request of $114 million. These filings apply to retail electric ($105 million), natural gas ($26 million) and water ($2 million) rates. Also in September 2001, WP&L filed a request with the PSCW, along with three other Wisconsin utilities, for an increase in rates of $16 million for incremental costs associated with the start-up and ongoing operations of ATC (WP&L has deferred $5.9 million of such costs at December 31, 2001). In December 2001, WP&L filed a request for interim rate relief related to such filings of approximately $63 million

($41 million for retail electric, $21 million for natural gas and

$1 million for water rates) to be effective on April 14, 2002.

The interim level is generally based on PSCW staff adjustments recommended in a recently completed audit. Reductions in purchased-power and fuel costs since the initial filing constituted a significant portion of such adjustments. As a result, these adjustments would have no impact on WP&V's financial condition or results of operations. WP&L expects final rates to be implemented in the third quarter of 2002 and to be set at levels higher than the interim levels, but significantly lower than the original request, although no assurance can be given. Also, in February 2002, WP&L filed a $6.2 million request with FERC for new wholesale electric base rates. WP&L also plans to file a base rate increase request with the PSCW in the second quarter of 2002 for its 2003 and 2004 rates. At this time, there are no plans for filing a new base rate case in Illinois for South Beloit.

In December 2001, the PSCW authorized WP&L to defer incremental costs for security measures and insurance premiums related to the September 11, 2001 terrorist attacks. WP&L began deferring the increased costs in December 2001 and the issue of cost recovery will be addressed in WP&LUs future base rate case proceedings.

In December 2000, WP&L requested a $73 million annual retail electric rate increase from the PSCW to cover increases in WP&Lis 2001 fuel and purchased-power costs. The PSCW approved a $46 million interim increase effective February 2001, which was replaced with a $58 million final increase effective June 2001. Two customer groups filed an appeal to a Wisconsin state court, challenging certain portions of the final order. This matter is still pending in state court. The final order included a refund provision for costs collected in rates that are in excess of actual costs incurred. In March 2002, WP&L filed with the PSCW to refund approximately $4 million to customers based on lower than projected fuel and purchased-power costs in 2001.

The refund amount ultimately provided by WP&L is subject to PSCW approval. WP&L had recorded the necessary reserve for the 2001 refund at December 31, 2001. In addition, WP&L filed with the PSCW in March 2002 for a decrease in retail electric rates of approximately $19 million based on lower fuel and purchased-power costs. The final amount of the decrease is subject to PSCW review and approval.

30 ALLIANT ENFRGY 2001 ANNUAL REPORT

WP&L believed Union Pacific was charging an excessive rate for transporting low-sulfur coal from the Powder River Basin to the Edgewater Generating Station located in Sheboygan, Wisconsin. To contest the rate, WP&L filed a rate case with the STB and, upon the expiration of the existing contract, began moving coal under a tariff rate beginning January 1, 2000. Following the STB's initial decision, WP&L, as part of a negotiated settlement, received payments from Union Pacific in 2001 of $4 million, covering the period from January 1, 2000 through October 22, 2001. While WP&L and Union Pacific have agreed upon future rates, both parties have filed petitions for reconsideration with the STB on certain aspects of its decision, which could impact the final amount received by WP&L.

The refund amount will also be reviewed by the PSCW in conjunction with WP&L's 2001 fuel refund filing.

In connection with a statewide docket to investigate compliance issues associated with the EPA's NOx emission reductions, in 1999 the PSCW authorized deferral of all incremental NOx compliance costs excluding internal labor and replacement purchased-power costs.

The PSCW approved WP&L's compliance plans and granted a 10-year straight-line depreciation method for NOx compliance investments. WP&L has deferred $3.0 million of costs at December 31, 2001 and anticipates recovery of these costs beginning with the base rate increase request filed in 2001. The depreciation lives will be reviewed every two years.

IP&L - IP&L plans on filing electric and natural gas base rate cases with the IUB in the Spring and Fall of 2002, respectively. The electric base rate case will include requests for recovery of its investments in its infrastructure that are intended to enable IP&L to continue delivering reliable utility service. IP&L has not yet determined the extent of rate relief it will seek. IP&L currently has no plans for filing new base rate cases in Illinois or Minnesota.

In January 2001, the IUB issued an order requiring IESU and IPC to file a joint fuel procurement plan in May 2001 for the purpose of evaluating the reasonableness of the Iowa utilities' fuel procurement contracts. This filing was completed in May 2001, hearings were held in November 2001 and final briefs were filed in January 2002. The outcome of this process cannot be predicted, but could potentially result in a refund of past collections by IP&L to its customers.

Results of Operations All "per share" references in the Results of Operations section refer to earnings per diluted share. Refer to Note 1 (a) of the "Notes to Consolidated Financial Statements" for discussion of the various components of Alliant Energy's business.

Overview - Alliant Energy's earnings per average common share (EPS) for 2001, 2000 and 1999 were as follows:

EPS per accounting principles generally accepted in the U.S.

Plus: EPS related to non-cash SFAS 133 valuation charges:

30-year exchangeable senior notes Electricity derivatives of a foreign affiliate of Alliant Energy Less: EPS related to income from Alliant Energy's adoption of SFAS 133 Less: EPS related to gains on sales of McLeod stock Adjusted EPS

  • Components do not foot to total due to rounding.

The 2001 increase in adjusted earnings was primarily due to an increase from Alliant Energy's non-regulated businesses of $0.14 per share ($0.36 and $0.22 per share in 2001 and 2000, respectively). Contributing to the increase were higher earnings from Alliant Energy's Investments business unit of $0.24 per share, led by record earnings from Alliant Energy's oil and gas business, and the impact of lower short-term interest rates. These items were partially offset by lower earnings from Alliant Energy's non-regulated Generation and Trading ($0.10 per share),

International ($0.08 per share) and Integrated Services ($0.04 per share) business units. Earnings from utility operations decreased

$0.07 per share ($2.05 and $2.12 per share in 2001 and 2000, respectively) due to increased operating expenses and lower gas margins, partially offset by a lower effective income tax rate, 2001 2000 *

$2.14

$5.03 1999

$2.51 0.26 0.02 2.58 0.20

$2.42

$2.26 0.32

$2.19 higher electric margins, a reduction of net interest expense and increased steam margins. Income of $0.13 per share ($0.08 and $0.05 per share at the parent company and IP&L, respectively) from the resolution of a significant tax case Alliant Energy had pursued for years also contributed to the 2001 increase in adjusted earnings.

Alliant Energy's transactions with Enron had a modest negative impact on Alliant Energy's electric and gas utility margins.

Weather did not have a material impact on Alliant Energy's 2001 utility results as the benefits from a colder than normal first quarter, high humidity levels for a portion of the summer and income realized from a weather hedge Alliant Energy had in place in the fourth quarter largely offset the impact of an extremely mild fourth quarter.

ALLIANT ENERGY 2001 ANNUAL REPORT 31

Management's Discussion and Analysis of Financial Condition and Results of Operations (continued)

In the previous table, all of the adjustments to EPS per accounting principles generally accepted in the U.S. were recorded at Alliant Energy's non-regulated businesses. The increased earnings from Alliant Energy's oil and gas business (Whiting) resulted from higher gas prices earlier in 2001, increased oil and gas sales volumes and income of $0.07 per share from a reduction in the estimated dismantlement cost of an offshore oil and gas platform, partially offset by higher operating and interest expenses. Increased earnings from Alliant Energy's affordable housing business also contributed to higher earnings from the Investments business unit. The lower earnings from Alliant Energy's non-regulated Generation and Trading business unit were the result of less volatile market prices, fewer weather-related trading opportunities in 2001 and charges for development costs from a merchant plant project that was canceled in 2001 that failed to meet Alliant Energy's required returns. The decreased income from the International business unit was due to lower results from Alliant Energy's Brazil and New Zealand/Australian investments, partially offset by increased income from Alliant Energy's investments in China. Refer to "Interest Expense and Other" for discussion of the results from Alliant Energy's investments in Brazil and New Zealand/Australia. The increase for China was largely due to the addition of five combined heat and power facilities to Alliant Energy's China portfolio in the last fifteen months. The lower results from the Integrated Services business unit were largely due to impacts of the slowing economy and transactions its gas marketing business had with Enron, partially offset by a one-time charge related to a loss on a contract in 2000.

Alliant Energy incurred charges of $0.04 per share in 2001 as a result of Enron's fourth quarter bankruptcy filing.

The increase in adjusted earnings for 2000 was primarily due to increased earnings at Whiting and Alliant Energy's non-regulated Generation and Trading business unit, partially offset by higher interest expense to fund Alliant Energy's strategic growth initiatives and the dilutive effect of Alliant Energy's January 2000 investment in several Brazilian utilities. Within the utility business, increased electric margins were offset by higher operating expenses.

Electric Utility Operations - Electric margins and MWh sales for Alliant Energy for 2001, 2000 and 1999 were as follows (in thousands):

Revenues and Costs Residential Commercial Industrial Total from ultimate customers Sales for resale Other Total revenues/sales Electric production fuels expense Purchased-power expense Margin 2001

$599,074 373,145 543,471 1,515,690 184,507 56,359 1,756,556 292,002 403,166

$1,061,388 2000

$567,283 349,019 501,155 1,417,457 173,148 57,431 1,648,036 271,073 294,818

$1,082,145 1999 6%

$541,714 7%

329,487 8%

476,140 7%

1,347,341 7%

155,801 (2%)

45,796 7%

1,548,938 8%

247,136 37%

255,446 (2%) $1,046,356 2001 5%

7,344 6%

5,464 5%

12,469 5%

25,277 11%

4,936 25%

168 6%

30,381 10%

15%

3%

  • Reflects the percent change from 2000 to 2001. **Reflects the percent change from 1999 to 2000.

Due to the formation of ATC on January 1, 2001, electric margin in 2001 included wheeling expenses from ATC of $30 million. Such expenses were offset by equity income (WP&L accounts for its investment in ATC under the equity method),

reduced other operation and maintenance expenses and lower depreciation expense, resulting in no significant net income impact due to the formation of ATC. On a comparable basis, electric margin increased $9.6 million, or 1 percent, and $35.8 million, or 3 percent, for 2001 and 2000, respectively. The 2001 increase was primarily due to lower purchased-power and fuel costs impacting margin, increased residential and commercial sales due to more favorable weather conditions in 2001 compared to 2000 and continued retail customer growth.

These items were partially offset by $10 million of income recorded in 2000 for a change in estimate of WP&LUs utility services rendered but unbilled at month-end and lower industrial sales, largely due to impacts of a slowing economy.

The 2000 increase was primarily due to increased sales to retail customers due to continued economic growth in Alliant Energy's utility subsidiaries' service territories, the favorable $10 million change in estimate of WP&L's utility services rendered but unbilled at month-end, increased energy conservation revenues and increased capacity sales. These items were partially offset by higher purchased-power and fuel costs and the impact of milder weather conditions on electric margin in 2000 compared to 1999.

The 1999 margin also included a favorable $9 million change in estimate of IESU's and IPC's utility services rendered but unbilled at month-end in Iowa.

32 AL[ANT NERGY 2001 ANNUAL REPORT MWhs Sold 2000 7,161 5,364 13,092 25,617 4,906 174 30,697 3%

2%

(5%)

(1%)

1%

(3%)

(1%)

7,024 5,260 13,036 25,320 5,566 162 31,048 2%

2%

1%

(12%)

7%

(1%)

1999

Refer to Note 1(j) of the "Notes to Consolidated Financial Statements" for information relating to utility fuel cost recovery. Refer to "Utility Industry Review - Rates and Regulatory Matters" for discussion of an IUB fuel investigation and various rate filings.

Gas Utility Operations - Gas margins and Dth sales for Alliant Energy for 2001, 2000 and 1999 were as follows (in thousands):

Residential Revenues and Costs 2001 2000 1999

$270,248

$245,697 10%

$185,090 33%

Commercial 141,121 127,104 11%

89,118 43%

Industrial 31,262 27,752 13%

21,855 27%

Transportation/other 45,246 14,395 214%

18,256 (21%)

Total revenues/sales 487,877 414,948 18%

314,319 32%

Cost of utility gas sold 360,911 278,734 29%

180,519 54%

Margin

$126,966

$136,214 (7%)

$133,800 2%

Reflects the percent change from 2000 to 2001. ** Reflects the percent change from 1999 to 2000.

2001 29,580 18,055 5,344 48,539 101,518 Dths Sold 2000 1999 32,026 (8%)

30,309 19,696 (8%)

18,349 5,350 5,963 43,931 10%

46,954 101,003 1%

101,575 Gas revenues and cost of utility gas sold increased significantly for 2001 and 2000 due to the large increase in natural gas prices in the first half of 2001 and last half of 2000. Due to Alliant Energy's rate recovery mechanisms for gas costs, these increases alone had little impact on gas margin. Gas margin decreased $9.2 million, or 7 percent, and increased $2.4 million, or 2 percent, for 2001 and 2000, respectively. The 2001 decrease was largely due to lower retail sales primarily related to unusually high gas prices earlier in 2001 as some customers either chose alternative fuel sources or used less natural gas, the impact of the slowing economy and losses associated with current commodity costs at WP&L, which are shared by ratepayers and shareowners. The 2000 increase in gas margin was largely due to more favorable weather conditions in the 2000 heating season compared to 1999. Alliant Energy realized pre-tax income of

$4.0 million, $2.2 million and $5.1 million from weather hedges it had in place in 2001, 2000 and 1999, respectively, which is recorded in "Miscellaneous, net" in the Consolidated Statements of Income.

Refer to Note 1(j) of the "Notes to Consolidated Financial Statements" for information relating to utility natural gas cost recovery.

Non-regulated and Other Revenues - Details regarding Alliant Energy's non-regulated and other revenues and data relating to Whiting's oil and gas operations for 2001, 2000 and 1999 are as follows:

Non-regulated and other revenues (in millions):

Integrated Services Investments:

Whiting Other International Other Whiting's volumes sold (in thousands):

Oil (barrels)

Gas (Dth)

Whiting's average product prices (excludes hedging activity):

Oil Gas 2001 2000 1999

$242

$172

$126 135 45 85 26

$533 2,087 19,751

$23.85

$3.82 94 44 32

$342 1,562 16,905

$26.96

$3.51 63 47 29

$265 1,317 17,915

$14.75

$2.23 ALLIANT ENERGY 2001 ANNUAL REPORT 33 6%

7%

(10%)

(6%)

(1%)

Management's Discussion and Analysis of Financial Condition and Results of Operations (continued)

The 2001 Integrated Services increase was primarily due to acquisitions in the third and fourth quarters of 2000 of various energy services businesses. Although gas prices were high at the beginning of 2001, these prices began to decline throughout the year. Whiting mitigated some of the impact of the decrease in prices in the latter half of 2001 by using physical forward contracts to lock in a portion of its volumes at prices higher than the prevailing market prices. The higher sales volumes in 2001 at Whiting were largely due to its continued acquisitions of proven reserves. The 2001 International increase resulted from the December 2000 change from the equity method of accounting to the consolidation method for an investment in China and the addition of five combined heat and power facilities to Alliant Energy's China portfolio in the last fifteen months. The 2000 Integrated Services increase was primarily due to various business acquisitions in 2000, increased activity in Alliant Energy's energy marketing business and greater demand for environmental and engineering services. Refer to Note 13 of the "Notes to Consolidated Financial Statements" for additional information on Whiting.

Other Operating Expenses - Other operation and maintenance expenses for 2001, 2000 and 1999 were as follows (in millions):

Utility Integrated Services Investments:

Whiting Other International Other 2001

$509 229 47 27 70 6

$888 2000

$497 158 37 29 5

9

$735 1999

$477 114 35 28 7

8

$669 The 2001 utility increase was primarily due to higher transmission wheeling and other costs in Alliant Energy's energy delivery business unit, increased nuclear operating costs (partially due to a planned refueling outage at Kewaunee in 2001), higher uncollectible customer account balances largely due to the unusually high gas prices earlier in the year and higher costs in the generation business unit. Such increases were partially offset by the impact of the formation of ATC earlier in 2001, as discussed in "Electric Utility Operations."

The 2000 utility increase was primarily due to a planned refueling outage at Kewaunee, higher expenses in the energy delivery and generation business units, increases in administrative and general expenses and higher energy conservation expenses. These increases were partially offset by expenses incurred in 1999 relating to Alliant Energy's Year 2000 program.

The 2001 Integrated Services increase was primarily due to the acquisitions of the various energy services businesses, partially offset by a one-time charge of $4 million related to a loss on a contract in 2000. The increase at Whiting was largely due to the increased production volumes. The International increase was largely due to the December 2000 change in accounting method for the China investment and the new power facilities.

The 2000 Integrated Services increase was primarily due to increased expenses from the energy marketing business, the 2000 business acquisitions and the one-time charge of $4 million.

Depreciation and amortization expense increased $11.8 million and $43.2 million in 2001 and 2000, respectively. Contributing to both increases were acquisitions at the non-regulated businesses and utility property additions. The 2001 increase was partially offset by a $9 million reduction in the estimated dismantlement cost of an offshore oil and gas platform at Whiting and the impact of the formation of ATC earlier in 2001, as discussed in "Electric Utility Operations." The lower dismantlement cost was due to the successful efforts to have the facility designated as a permanent facility, therefore reducing the amount of dismantlement required. Earnings on the WP&L nuclear decommissioning trust fund also partially offset the 2001 increase, but contributed to the 2000 increase (approximately $20 million). The accounting for earnings on the nuclear decommissioning trust fund results in no net income impact. Miscellaneous, net income increases for earnings on the trust fund and the corresponding offset is recorded through depreciation expense at WP&L.

Taxes other than income taxes increased $5.9 million in 2001 primarily due to increased gross receipts, payroll and oil and gas production taxes.

Interest Expense and Other - Alliant Energy recorded income tax and associated interest income of $0.13 per share in 2001 related to a ruling in a tax refund case. The federal government decided in the fourth quarter of 2001 not to pursue the ruling in favor of Alliant Energy by the U.S. Court of Appeals for the Eighth Circuit dealing with capital losses disallowed under audit by the Internal Revenue Service and certain related deductions. An additional potential refund remains a contested issue in this case. Alliant Energy cannot offer any assurance it will be successful in obtaining this additional refund and has not recognized any income for the potential additional refund.

Interest expense increased $16.9 million and $37.4 million in 2001 and 2000, respectively. Contributing to both increases were higher non-regulated borrowings to fund a large portion of its strategic growth initiatives as Alliant Energy had non regulated construction and acquisition expenditures of $478 million and $762 million in 2001 and 2000, respectively.

Partially offsetting the 2001 increase was the impact of lower interest rates on Alliant Energy's variable rate borrowings.

Also contributing to the 2000 increase were higher utility borrowings and higher interest rates associated with short-term debt outstanding.

34 ALLIANT ENERGY 2001 ANNUAL REPORT

Equity income (loss) from Alliant Energy's unconsolidated investments for 2001, 2000 and 1999 was as follows (in millions):

2001 New Zealand/Australia

$17 ATC (began operations 1/01/01) 15 Cargill-Alliant 7

China Brazil Other 2

(4)

(1)

$36 2000 1999

$3 15 1

3 (3)

$19 5

(1)

(1)

$3 Equity income from unconsolidated investments increased

$17 million and $16 million in 2001 and 2000, respectively.

The 2001 New Zealand/Australia increase was primarily due to

$16 million of pre-tax non-cash SFAS 133 valuation income from Southern Hydro, partially offset by the impact of a drought in New Zealand in 2001. The lower earnings in 2001 at Alliant Energy's electricity-trading joint venture were due to less volatile market prices and fewer weather-related trading opportunities in 2001. The majority of Alliant Energy's investment in China is accounted for under the consolidation method. The lower results from Alliant Energy's Brazil investments in 2001 were largely due to lower sales related to a severe drought; impacts of a settlement reached in the fourth quarter of 2001 between the Brazil government and the distribution companies related to the economic resolution of the impacts of rationing, the recovery of past costs and the prices allowed for sales of excess generation into the spot market; commercial energy losses; higher uncollectible customer account balances; and higher interest expense. In connection with the settlement reached with the government, Alliant Energy's Brazil investments recorded an asset (Alliant Energy's share was approximately $35 million) related to legislation allowing the companies to collect these revenues in future rates. Such revenues have already been recognized in earnings. As a result of the Brazil drought in 2001, the government implemented a significant electricity rationing program in June 2001 given that the large majority of generation in Brazil is hydroelectric. Brazil has recently been receiving significant rainfall resulting in the hydro plant water levels returning to more normal levels. Accordingly, the government completely lifted the rationing requirements effective March 1, 2002. Alliant Energy and its Brazilian partners are also executing a plan designed to achieve significant reductions in commercial energy losses and enhanced collection of customer receivables. The 2000 increase in equity income from unconsolidated investments was primarily due to the increased earnings from Alliant Energy's electricity-trading joint venture due to more weather related trading opportunities in 2000 and earnings from investments made in Brazil and New Zealand/Australia in 2000.

On July 1, 2000, Alliant Energy adopted SFAS 133 for its consolidated entities. Related to the adoption, Alliant Energy recorded a $321.3 million pre-tax gain from the designation of a portion of Alliant Energy's McLeod holdings as trading securities. This gain related to the unrealized appreciation in value of approximately 27 percent of Alliant Energy's McLeod holdings that were designated as trading as of the adoption date.

In 2000 and 1999, Alliant Energy sold approximately 1.3 million and 4.3 million shares, respectively, of its investment in McLeod, resulting in pre-tax gains of approximately $24 million and $40 million, respectively.

Miscellaneous, net income decreased $21.8 million and increased $14.1 million in 2001 and 2000, respectively. The 2001 decrease was largely due to higher non-cash SFAS 133 valuation charges of $33 million related to the net change in the value of the McLeod trading securities and the derivative component of Resources' exchangeable senior notes, reduced nuclear decommissioning trust fund earnings and lower gains from asset sales. The decreases were partially offset by higher interest income, including $10 million and $4 million from tax settlements in 2001 and 2000, respectively. Alliant Energy realized $4.0 million, $2.2 million and $5.1 million of income from weather hedges in 2001, 2000 and 1999, respectively. The 2000 increase was primarily due to a change of $102 million in the value of the derivative component of Resources' exchangeable senior notes and increased interest income (including nuclear decommissioning trust fund earnings and

$4 million recognized from a tax settlement at IESU), partially offset by a decrease of $103 million in the value of the McLeod trading securities and a decrease of $4 million in gains from sales of certain investments at Whiting and New Zealand.

Refer to Note 10(a) of the "Notes to Consolidated Financial Statements" for additional information related to the exchangeable senior notes embedded derivative, the McLeod trading securities and the cumulative effect of a change in accounting principle.

Income Taxes - The effective income tax rates for Alliant Energy were 23.8 percent, 38.1 percent and 37.2 percent in 2001, 2000 and 1999, respectively. Refer to Note 5 of the "Notes to Consolidated Financial Statements" for additional information.

ALLIANT ENERGY 2001 ANNUAL REPORT 35

Management's Discussion and Analysis of Financial Condition and Results of Operations (continued)

Liquidity and Capital Resources Overview - Given Alliant Energy's financing flexibility, including access to both the debt and equity securities markets, management believes it has the necessary financing capabilities in place to adequately finance its capital requirements for the foreseeable future. Alliant Energy's capital requirements are primarily attributable to Resources' acquisition and investment opportunities, its utility subsidiaries' construction and acquisition programs and its debt maturities. Alliant Energy expects to meet its future capital requirements with cash generated from operations, sales of assets and external financings. The level of cash generated from operations is partially dependent on economic conditions, legislative activities and timely regulatory recovery of utility costs.

Liquidity and capital resources are also affected by costs associated with environmental and regulatory issues.

In October 2001, Alliant Energy and Resources received SEC approval for their ongoing program of external financing, credit support arrangements and other related proposals for the period through December 31, 2004. Among other things, the approval authorized Alliant Energy directly or through financing subsidiaries to issue common and preferred stock, unsecured long-term debt securities and other equity-linked securities up to an amount of $1.5 billion; to provide guarantees and credit support for obligations of its subsidiaries up to an amount of $3 billion; to enter into hedging transactions to manage interest rate costs and risk exposure; and to increase its aggregate investment limit in exempt wholesale generators (EWGs) and foreign utility companies (FUCOs) to 100 percent of consolidated retained earnings.

The approval, among other things, also authorized Resources to provide guarantees and credit support for obligations of non-utility subsidiaries up to an amount of $600 million outstanding at any one time and to expend up to $800 million to construct or acquire energy assets that are incidental to the energy marketing and oil and gas productions of its subsidiaries.

Based on current expectations, Alliant Energy plans to invest approximately $4 billion in various capital projects and investments in 2002-2006, including domestic and international acquisitions, generation projects and environmental compliance initiatives. These various investments are described in detail below.

Cash Flows - In 2001, Alliant Energy's cash flows from financing activities decreased $408 million primarily due to net changes in amount of debt issued and retired, partially offset by proceeds from the issuance of common stock in 2001; and cash flows used for investing activities decreased $272 million primarily due to lower non-regulated investments. In 2000, Alliant Energy's cash flows from financing activities increased

$507 million primarily as a result of $402.5 million of exchangeable senior notes issued to fund investments in the non-regulated businesses, including a $347 million investment in Brazil.

Equity - In November 2001, Alliant Energy completed a public offering of 9.775 million shares of its common stock at a price per share to the public of $28.00. The net proceeds of approximately $263 million were used to repay short-term debt.

Long-Term Debt - At December 31, 2001, Resources had available $450 million of committed bank lines of credit extending through October 2003 for direct borrowing or to support commercial paper, of which $384 million of commercial paper was outstanding. Commitment fees are paid to maintain this facility and there were no conditions restricting the unused credit at December 31, 2001. Currently, Resources anticipates this facility will be renewed upon expiration.

This credit facility agreement, as well as the $150 million facility discussed below in "Short-Term Debt," contains various covenants, including requirements that Alliant Energy maintain a consolidated debt-to-capital ratio of less than 65 percent and a consolidated net worth of at least $1.4 billion. The debt component of the capital ratio includes long-and short-term debt, as well as guarantees and capital lease obligations, and the common equity component excludes accumulated other comprehensive income (loss). Alliant Energy's debt-to-capital ratio and net worth at December 31, 2001 were 58 percent and

$1.92 billion, respectively.

At December 31, 2001, Alliant Energy had $685 million of long-term debt that will mature prior to December 31, 2006.

Depending on market conditions, it is anticipated that a majority of the maturing debt will be refinanced with the issuance of long-term securities.

Refer to Note 8(b) of the "Notes to Consolidated Financial Statements" for additional information on long-term debt, including issuances by Resources and IESU in 2001.

Short-Term Debt - At December 31, 2001, Resources had available $150 million of committed bank lines of credit extending through October 2002 for direct borrowing or to support commercial paper, none of which was outstanding at December 31, 2001. Commitment fees are paid to maintain this facility and there were no conditions restricting the unused credit at December 31, 2001. Currently, Resources anticipates this facility will be renewed upon expiration.

At December 31, 2001, Alliant Energy also had $300 million of committed bank lines of credit extending through October 2002 available for direct borrowing or to support commercial paper, of which $68 million of commercial paper was outstanding.

Commitment fees are paid to maintain these lines and there were no conditions restricting the unused lines of credit at December 31, 2001. Alliant Energy anticipates that this facility will be renewed upon expiration. Alliant Energy has 36 ALLIANT ENERGY 2001 ANNUAL REPORT

agreements with several financial institutions to periodically borrow from uncommitted "as-offered" credit lines in lieu of commercial paper. There are no commitment fees associated with these agreements and there were no borrowings outstanding under these agreements at December 31, 2001.

In addition to funding working capital needs, the availability of short-term financing provides the companies flexibility in the issuance of long-term securities. The level of short-term borrowing fluctuates based on seasonal corporate needs, the timing of long-term financing and capital market conditions. At December 31, 2001, IESU, WP&L and IPC were authorized by the applicable federal or state regulatory agency to issue short-term debt of $150 million, $240 million and $75 million, respectively.

Alliant Energy anticipates that short-term debt will continue to be available at reasonable costs due to current ratings by credit rating services. Refer to Note 8(a) of the "Notes to Consolidated Financial Statements" for additional information on short-term debt, including information on the utility money pool.

Debt Ratings - Access to the long-term and short-term capital and credit markets, and costs of external financing, are dependent on creditworthiness. The debt ratings of Alliant Energy and certain subsidiaries by Moody's and Standard & Poor's were as follows at December 31, 2001:

IESU Secured long-term debt Unsecured long-term debt WP&L Secured long-term debt Unsecured long-term debt IPC Secured long-term debt Resources Commercial paper (a)

Unsecured long-term debt (a)

Alliant Energy Commercial paper (b)

Moody's Standard & Poor's Al A

A2 Aa2 Aa3 Al P-2 Baal P-2 BBB+

A+

A A

A-2 BBB+

A-2 (a)

Resources' debt is fully and unconditionally guaranteed by Alliant Energy.

(b)

IP&L and WP&L participate in a utility money pool that is funded, as needed, through the issuance of commercial paper by Alliant Energy. Interest expense and other fees are allocated based on borrowing amounts. The PSCW has restricted WP&L from lending money to non-utility affiliates and non-Wisconsin utilities. As a result, WP&L can only borrow money from the utility money pool.

Ratings Triggers - The long-term debt of Alliant Energy and its subsidiaries is not subject to any repayment requirements as a result of credit rating downgrades or so-called "ratings triggers." However, certain lease agreements of Alliant Energy do contain such ratings triggers. The threshold for these triggers varies among the applicable leases. If the payments were accelerated under all the affected leases it would result in accelerated payments of less than $100 million.

Sale of Accounts Receivable - Refer to Note 4 of the "Notes to Consolidated Financial Statements" for information on Alliant Energy's sale of accounts receivable program.

Financial Guarantees and Commitments - At December 31, 2001, Alliant Energy had certain off-balance sheet financial guarantees and commitments outstanding related to Alliant Energy's electricity-trading joint venture and unconsolidated affiliate and third-party financing arrangements. Refer to Note 11(d) of the "Notes to Consolidated Financial Statements" for additional information.

Alliant Energy has various synthetic leases related to the financing of its corporate headquarters, corporate aircraft, certain utility railcars and a utility radio dispatch system. Certain financings involve the use of unconsolidated structured finance or special purpose entities. Alliant Energy believes these financings are not material to its liquidity or capital resources.

Alliant Energy also uses several consolidated special purpose entities for its utility sale of accounts receivable program.

Alliant Energy does not use special purpose entities for any other purpose. These financings are fully reported in Notes 3 and 4 of the "Notes to Consolidated Financial Statements."

Credit Risk - Credit risk is inherent in Alliant Energy's operations and relates to the risk of loss resulting from non-performance of contractual obligations by a counterparty.

Alliant Energy maintains credit risk oversight and sets limits and policies with regards to its counterparties, which management believes minimizes its overall credit risk exposure.

However, there is no assurance that such policies will protect Alliant Energy against all losses from non-performance by counterparties.

ALLIANT ENERGY 2001 ANNUAL REPORT 37

Management's Discussion and Analysis of Financial Condition and Results of Operations (continued)

Although Alliant Energy had modest contracts with Enron, their bankruptcy has had an insignificant impact on Alliant Energy's day-to-day operations. In the fourth quarter of 2001, Alliant Energy recorded a pre-tax charge of $5 million related to outstanding contracts with Enron. Alliant Energy has replaced certain Enron contracts by entering into contracts with credit-worthy counterparties where deemed necessary.

Environmental - Alliant Energy's pollution abatement programs are subject to continuing review and are periodically revised due to changes in environmental regulations, construction plans and escalation of construction costs. While management cannot precisely forecast the effect of future environmental regulations on operations, it has taken steps to anticipate the future while also meeting the requirements of current environmental regulations.

Wisconsin facilities are subject to state and federal requirements of the Clean Air Act (CAA), including meeting ambient air quality standards. Based on modeling conducted under the CAA by the Wisconsin DNR, an eastern portion of Wisconsin along Lake Michigan, in which WP&L's Edgewater Generating Station is located, has been designated as non attainment with respect to the one-hour ozone air quality standard. The Wisconsin DNR has developed a rate-of-progress (ROP) rule to bring the area into attainment with the standard.

The rule requires Edgewater Generating Station to meet annual NOx emission reductions beginning in May 2003 and ending in May 2007. Thereafter, the May 2007 ozone emission standard will apply to the facility. The Wisconsin DNR will determine the success of the ROP rule through modeling. To date, the modeling data still indicates the area is non-attainment with the one-hour ozone standard although recent data indicates the air quality is improving. Based on existing technology, Alliant Energy estimates the capital investments required to meet the ROP rule through 2007 will be approximately $15 million.

Alliant Energy is also pursuing voluntary NOx reductions and has developed a unique and cost effective technology to reduce NOx emissions from power generating facilities. The U.S.

Department of Energy has awarded Alliant Energy a $2.5 million federal grant for its innovation for leading edge clean coal technologies.

Revisions to the Wisconsin Administrative Code have been proposed that could have a significant impact on WP&L's operation of its Wisconsin generating facilities. The proposed revisions would affect the amount of heat that WP&L's generating stations can discharge into Wisconsin waters.

WP&L cannot presently predict the final outcome of the revisions but believes that, as the revisions are currently proposed, capital investments and/or modifications required to meet the proposed discharge limits could be significant.

In 2000, the EPA made a regulatory determination in favor of controlling Hazardous Air Pollutant Emissions (HAPs)

(including mercury) from electric utilities, which was challenged by utility industry groups in two lawsuits filed in February 2001. The court has since ruled in favor of the EPA in both cases. The EPA is currently developing regulations that are expected to be in place by 2004, with a compliance deadline of 2007. Although the level of control of mercury and other HAPs from generating plants is uncertain at this time, Alliant Energy believes that capital investments and/or modifications that may be required to control these emissions could be significant.

Also in 2000, the WNRB voted to allow the Wisconsin DNR to proceed with rulemaking to reduce mercury emissions. WP&L and the other Wisconsin Utility Association members have recommended to the WNRB a workable state-level mercury emissions control program that protects reliability and does not disadvantage Wisconsin when federal mercury rules are later developed. The Wisconsin DNR issued the proposed rule in May 2001, which is expected to be modified in late 2002.

Alliant Energy cannot presently predict the final outcome of the regulation, but believes that required capital investments and/or modifications to achieve compliance with the regulation could be significant.

In December 2000 and February 2001, the EPA requested certain information relating to the historical operation of WP&L's major coal-fired generating units in Wisconsin. WP&L has responded to both requests and has not yet received a response from the EPA. In some cases involving similar EPA requests from other electric generating facilities, penalties and capital expenditures have resulted. The U.S. Department of Justice is currently conducting a review of this enforcement initiative to assess whether it is consistent with the CAA. In addition, on a broader basis, the EPA is assessing the impact of investments in utility generation capacity, energy efficiency and environmental protection, as well as assessing proposed multi-pollutant legislation. Results of these reviews are expected in mid-2002. Alliant Energy cannot presently predict what impact, if any, these issues may have on its financial condition or results of operations. However, any required remedial action resulting from these matters could be significant.

Refer to Note 11(e) of the "Notes to Consolidated Financial Statements" for further discussion of environmental matters.

Construction and Acquisition Expenditures - Capital expenditures, investments and financing plans are continually reviewed, approved and updated as part of Alliant Energy's ongoing strategic planning and annual budgeting processes.

In addition, material capital expenditures and investments are subject to a rigorous cross-functional review prior to approval.

Changes in Alliant Energy's anticipated construction and 38 ALLIANT ENERGY 2001 ANNUAL REPORT

acquisition expenditures may result from a number of reasons including economic conditions, regulatory requirements, ability to obtain adequate and timely rate relief, the level of Alliant Energy's profitability, Alliant Energy's desire to maintain investment-grade credit ratings and reasonable capitalization ratios, variations in sales, changing market conditions and new opportunities. Alliant Energy believes its capital control processes adequately reduce the risks associated with large capital expenditures and investments. Alliant Energy's utility subsidiaries anticipate financing their construction expenditures, including new electric generation facilities, during 2002-2006 through internally generated funds supplemented, when necessary, by outside financing. Funding for Resources' construction and acquisition expenditures over that same period of time is expected to be accomplished with a combination of external financings, sales of assets and internally generated funds. Alliant Energy believes it has a strong financial position that provides it the ability to issue external financings at competitive rates.

Alliant Energy currently anticipates 2002 construction and acquisition expenditures will be approximately $800 million, consisting of $400 million for its utility operations, $170 million for oil and gas investments, $100 million for non regulated generation investments, $55 million for energy related international investments and $75 million for other business development initiatives at Resources. During 2003 2006, Alliant Energy currently anticipates construction and acquisition expenditures of approximately $1.9 billion for its utility operations, $960 million for non-regulated generation investments, $260 million for oil and gas investments, $200 million for energy-related international investments and $310 million for other business development initiatives at Resources.

These amounts do not include any potential capital expenditures Alliant Energy may make for its Power Iowa domestic generation program given the uncertainty of such investments, including if Alliant Energy would own the generating plants or purchase the power from plants that were owned by an independent entity.

Alliant Energy expects to pursue various potential domestic and international business development opportunities and is devoting resources to such efforts. International investments may carry a higher level of risk than Alliant Energy's traditional domestic utility or non-regulated investments. Such risks could include foreign government actions, economic and currency risks and others. However, Alliant Energy will strive to select investments where risks are both understood and manageable.

Previously, aggregate investments of Alliant Energy in EWGs and FUCOs were limited to 50 percent of Alliant Energy's consolidated retained earnings under PUHCA. In May 2001, Alliant Energy filed an application with the SEC to request, among other things, aggregate investment authority in the amount of $1.75 billion. In October 2001, the SEC issued an order approving an increase in Alliant Energy's aggregate investment authority from 50 percent to 100 percent of consolidated retained earnings and reserved its jurisdiction over the increase to $1.75 billion until further completion of the record, which is subject to the receipt of all required state regulatory certifications (one of the four certifications needed has been received thus far). At December 31, 2001, Alliant Energy's remaining investment authority under the 100 percent of consolidated retained earnings order was approximately $50 million of future EWG and/or FUCO investments in addition to certain commitments already made. If Alliant Energy is unable to attain the increase to $1.75 billion in aggregate investment authority, it could limit its ability to finance additional investments in EWGs and FUCOs with financings that have recourse to the parent company.

Under WUHCA, there is an asset cap provision that limits certain non-utility assets in a utility holding company to 25 percent of utility assets. Under the provisions of the law, assets related to the provision of various energy-related, environmental engineering and telecommunications services are not included in the calculation of either utility or non utility assets.

Other Matters Market Risk Sensitive Instruments and Positions - Alliant Energy's primary market risk exposures are associated with interest rates, commodity prices, equity prices and currency exchange rates. Alliant Energy has risk management policies to monitor and assist in controlling these market risks and uses derivative instruments to manage some of the exposures.

Interest Rate Risk - Alliant Energy is exposed to risk resulting from changes in interest rates as a result of its issuance of variable-rate debt and its utility accounts receivable sale program. Alliant Energy manages its interest rate risk by limiting its variable interest rate exposure and by continuously monitoring the effects of market changes on interest rates.

Alliant Energy has also historically used interest rate swap and interest rate forward agreements to assist in the management of its interest exposure. In the event of significant interest rate fluctuations, management would take actions to minimize the effect of such changes on Alliant Energy's results of operations and financial condition. Assuming no change in Alliant Energy's consolidated financial structure, if variable interest rates were to average 100 basis points higher (lower) in 2002 than in 2001, interest expense and pre-tax earnings would increase (decrease) by approximately $8.1 million. This amount was determined by considering the impact of a hypothetical 100 basis points increase (decrease) in interest rates on Alliant Energy's consolidated variable-rate debt held and the amount outstanding under its accounts receivable sale program at December 31, 2001.

ALLIANT ENERGY 2001 ANNUAL REPORT 39

Management's Discussion and Analysis of Financial Condition and Results of Operations (continued)

Commodity Risk - Non-trading - Alliant Energy is exposed to the impact of market fluctuations in the commodity price and transportation costs of electricity, natural gas and oil products it markets. Alliant Energy employs established policies and procedures to manage its risks associated with these market fluctuations including the use of various commodity derivatives. Alliant Energy's exposure to commodity price risks in its utility business is significantly mitigated by the current rate making structures in place for the recovery of its electric fuel and purchased energy costs as well as its cost of natural gas purchased for resale. Refer to Note 1j) of the "Notes to Consolidated Financial Statements" for further discussion.

WP&L periodically utilizes gas commodity derivative instruments to reduce the impact of price fluctuations on gas purchased and injected into storage during the summer months and withdrawn and sold at current market prices during the winter months. The gas commodity swaps in place approximate the forecasted storage withdrawal plan during this period. Therefore, market price fluctuations that result in an increase or decrease in the value of the physical commodity are substantially offset by changes in the value of the gas commodity swaps. To the extent actual storage withdrawals vary from forecasted withdrawals, WP&L has physical commodity price exposure. A 10 percent increase (decrease) in the price of gas would not have a significant impact on the combined fair market value of the gas in storage and related swap arrangements in place at December 31, 2001.

IP&L also utilizes natural gas commodity derivative instruments to mitigate the risk of rising prices. Since the IUB allows for the prudently incurred costs associated with these instruments and the underlying supply of natural gas to be recovered from ratepayers, IP&L does not have significant natural gas commodity risk exposure.

Whiting is exposed to market risk in the pricing of its oil and gas production. Historically, prices received for oil and gas production have been volatile because of seasonal weather patterns, supply and demand factors, transportation availability and price, and general economic conditions. Worldwide political developments have historically also had an impact on oil prices. Whiting periodically utilizes oil and gas swaps, forward contracts and options to mitigate the impact of oil and gas price fluctuations. Historically, Alliant Energy has hedged approximately 50 percent of its oil and gas volumes. The actual level of hedging utilized is based on management's assessment of the prudency of hedging given current market conditions and other factors and is reviewed on an ongoing basis. Whiting mitigated some of the impact of the decrease in prices in the latter half of 2001 by locking in a portion of its volumes at prices higher than the prevailing market prices. Based on Whiting's estimated oil and gas sales in 2002, and the forward contracts outstanding for such period, a sustained 10 percent increase (decrease) in oil and gas prices would impact Alliant Energy's pre-tax 2002 earnings by approximately $13 million.

Southern Hydro, a foreign affiliate of Alliant Energy accounted for under the equity method of accounting, owns and operates hydroelectric generation facilities in the state of Victoria in Australia. These generation facilities operate as peaking units.

Under the rules of the Australian market, Southern Hydro must sell all of its production into a spot market in which the price changes every five minutes and is set on the average of each half hour. Electricity prices in this market can and have been very volatile. In order to manage the electricity commodity price risk associated with anticipated sales into the spot market, Southern Hydro enters into a variety of electricity derivative contracts with terms of up to five years. The value of these derivative instruments can change significantly as a result of changes in forward electricity prices. These instruments do not qualify for hedge accounting under SFAS 133. Accordingly, per accounting principles generally accepted in the U.S.,

changes in the fair value of these derivatives, which are non cash valuation adjustments, must be reported in Southern Hydro's earnings. Alliant Energy believes Southern Hydro's ownership of the physical generating facilities that are not marked-to-market, combined with the electricity derivative contracts, act as an economic hedge to volatile electricity prices, such that Southern Hydro's net economic exposure to volatile electricity prices over the next five years is managed within reasonable limits. Southern Hydro manages market risks inherent in its business through established derivative trading and risk management policies and tools. The principal tool utilized in managing the risks associated with volatile prices is a five-day Earnings-at-Risk (EAR) model which calculates EAR to a 95 percent confidence level. At December 31, 2001, the estimated EAR for Southern Hydro for expected earnings in 2002 was approximately $1 million.

Commodity Risk - Trading - Alliant Energy is exposed to market risks through its electricity-trading business, which is primarily conducted through Alliant Energy's 50/50 joint venture with Cargill. The joint venture's trading activities principally consist of marketing and trading over-the-counter forward contracts for the purchase and sale of electricity. The majority of the forward contracts represent commitments to purchase or sell electricity at fixed prices in the future and require settlement by physical delivery of electricity or are netted out in accordance with industry trading standards. The market prices used to determine fair values reflect the joint venture's best estimate considering various factors, including closing exchanges and over-the-counter quotations, time value, volatility and credit risk factors. The joint venture manages the market risks inherent in its trading activities through established trading and risk management policies and tools.

The principal tool utilized is a one-day variance/covariance Value-at-Risk (VAR) model with assessment adjustments made based on weather, transmission availability, generation outages and other factors. The estimated one-day market VAR for the joint venture at December 31, 2001 was $0.6 million, which was calculated with a 99 percent confidence level. The low, average and high VAR in 2001 were $0.2 million, $0.7 million and $1.7 million, respectively.

40 ALLIANT -NEPGY 2001 ANNUAL REPORT

Alliant Energy does have a gas marketing business that engages in gas trading activities. However, Alliant Energy does not deem such activities to be material.

Equity Price Risk - IP&L and WP&L maintain trust funds to fund their anticipated nuclear decommissioning costs. At December 31, 2001 and 2000, these funds were invested primarily in domestic equity and debt instruments.

Fluctuations in equity prices or interest rates will not affect Alliant Energy's consolidated results of operations as such fluctuations are recorded in equally offsetting amounts of investment income and depreciation (WP&L) or interest (IP&L) expense when they are realized. In February 2001, WP&L entered into a four-year hedge on equity assets in its nuclear decommissioning trust fund. Refer to Note 10(c) of the "Notes to Consolidated Financial Statements" for further discussion.

At December 31, 2001 and 2000, Alliant Energy had an investment in the stock of McLeod, a publicly traded telecommunications company, valued at $21 million and $791 million, respectively. In addition to the equity risk associated with the investment in McLeod, Alliant Energy also has equity risk related to the option liability embedded within Resources' exchangeable senior notes. Refer to Note 10(a) of the "Notes to Consolidated Financial Statements" for further discussion. A 10 percent increase (decrease) in the quoted market price at December 31, 2001 would not have a significant impact on net income as any resulting increase (decrease) in the value of the option would be substantially offset by a corresponding increase (decrease) in the value of the McLeod shares classified as trading (valued at $6 million at December 31, 2001). At December 31, 2001, the McLeod available-for-sale securities were valued at $15 million. A 10 percent increase (decrease) in the quoted market price at December 31, 2001 would have increased (decreased) the value of the investment of the available-for-sale securities by $1.5 million.

At December 31, 2001 and 2000, Alliant Energy had various other investments, accounted for under the cost method of accounting, which were valued at $24 million and $52 million, respectively. Refer to Note 9 of the "Notes to Consolidated Financial Statements" for additional information. A 10 percent increase (decrease) in the quoted market prices at December 31 would have increased (decreased) the value of these investments at December 31, 2001 by approximately $2.4 million.

Currency Risk - Alliant Energy has investments in various countries where the net investments are not hedged, including Australia, Brazil, China and New Zealand. As a result, these investments are subject to currency exchange risk with fluctuations in currency exchange rates. At December 31, 2001, Alliant Energy had a cumulative foreign currency translation loss of $127 million - related to decreases in value of the Brazil real of $88 million, New Zealand dollar of $28 million and Australian dollar of $11 million in relation to the U.S. dollar - recorded in "Accumulated other comprehensive income (loss)" on its Consolidated Balance Sheets. The cumulative foreign currency translation loss at December 31, 2000 was $60 million. Based on Alliant Energy's investments at December 31, 2001, a 10 percent sustained increase (decrease) over the next 12 months in the foreign exchange rates of Australia, Brazil, China and New Zealand would increase (decrease) the cumulative foreign currency translation loss by $50 million. Alliant Energy's equity income from its foreign investments is also impacted by fluctuations in currency exchange rates.

Refer to Notes 1(n) and 10 of the "Notes to Consolidated Financial Statements" for further discussion of Alliant Energy's derivative financial instruments.

Accounting Pronouncements - In July 2001, the FASB issued SFAS 141, "Business Combinations," and SFAS 142, "Goodwill and Other Intangible Assets." SFAS 141 requires that all business combinations be accounted for using the purchase method. Use of the pooling-of-interests method is no longer allowed. The provisions of SFAS 141 were effective for all business combinations initiated after June 30, 2001. SFAS 142 addresses the method of accounting for acquired goodwill and other intangible assets upon, and subsequent to, the date of the acquisition. Among other provisions, SFAS 142 eliminates the amortization of goodwill and replaces it with periodic assessments of the realization of the recorded goodwill and other intangible assets. Alliant Energy's adoption of SFAS 142 will result in the elimination of approximately $4 million of after-tax goodwill amortization in 2002 that was incurred in 2001. Alliant Energy did not incur goodwill or other intangible assets impairment charges upon its adoption of SFAS 142.

In August 2001, the FASB issued SFAS 143, "Accounting for Asset Retirement Obligations," which addresses financial accounting and reporting for obligations associated with the retirement of tangible long-lived assets and the associated asset retirement costs. Alliant Energy must adopt SFAS 143 no later than January 1, 2003. With regards to the decommissioning of DAEC and Kewaunee, SFAS 143 will require IP&L and WP&L, respectively, to record at fair value the decommissioning liability and a corresponding asset, which will then be depreciated over the remaining expected service lives of the plants' generating units. Currently, decommissioning amounts collected in rates and the investment earnings are reported in accumulated depreciation. Alliant Energy has not yet determined what other assets may have associated retirement costs as defined by SFAS 143. Alliant Energy does not anticipate SFAS 143 will have a material impact on its financial condition or results of operations.

ALLIANT ENERGY 2001 ANNUAL REPORT 4]

Management's Discussion and Analysis of Financial Condition and Results of Operations (continued)

In October 2001, the FASB issued SFAS 144, "Accounting for the Impairment or Disposal of Long-Lived Assets," which addresses financial accounting and reporting for the impairment or disposal of long-lived assets. Alliant Energy adopted SFAS 144 on January 1, 2002. Alliant Energy expects that the implementation of SFAS 144 will not have a material impact on its financial condition or results of operations.

Critical Accounting Policies - Alliant Energy believes the policies identified below are critical to Alliant Energy's business and the understanding of its results of operations.

The impact and any associated risks related to these policies on Alliant Energy's business are discussed throughout MD&A where applicable. Refer to Note 1 of the "Notes to Consolidated Financial Statements" for detailed discussion on the application of these and other accounting policies. The preparation of the consolidated financial statements requires management to make estimates and assumptions that affect: a) the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements; and b) the reported amounts of revenues and expenses during the reporting period. Alliant Energy evaluates its estimates on an ongoing basis and bases them on a combination of historical experience and various other assumptions that are believed to be reasonable under the circumstances. Actual results could differ from those estimates.

Alliant Energy's critical accounting policies that affect its more significant judgments and estimates used in the preparation of its consolidated financial statements are as follows:

Regulatory Assets and Liabilities - SFAS 71, "Accounting for the Effects of Certain Types of Regulation," requires rate regulated public utilities to record certain costs and credits allowed in the rate making process in different periods than for non-regulated entities. These costs and credits are deferred as regulatory assets or accrued as regulatory liabilities and are recognized in the Consolidated Statements of Income at the time they are reflected in rates. Alliant Energy's utility subsidiaries recognize regulatory assets and liabilities in accordance with rulings of their federal and state regulators and future regulatory rulings may impact the carrying value and accounting treatment of Alliant Energy's regulatory assets and liabilities. Alliant Energy evaluates and revises the accounting for its regulatory assets and liabilities on an ongoing basis, and as new regulatory orders are issued, to properly account for its activities under SFAS 71.

Derivative Financial Instruments - Alliant Energy uses derivative financial instruments to hedge exposures to fluctuations in interest rates, certain commodity prices, volatility in a portion of natural gas sales volumes due to weather and to mitigate the equity price volatility associated with certain investments in equity securities. Alliant Energy does not use such instruments for speculative purposes. To account for these derivative instruments in accordance with the applicable accounting rules, Alliant Energy must determine the fair value of its derivatives. If an established, quoted market exists for the underlying commodity of the derivative instrument, Alliant Energy uses the quoted market price to value the derivative instrument. For other derivatives, Alliant Energy estimates the value based upon other quoted prices or acceptable valuation methods. Alliant Energy also reviews the nature of its contracts for the purchase and sale of non financial assets to assess whether the contracts meet the definition of a derivative and the requirements to follow hedge accounting as allowed by the applicable accounting rules. The determination of derivative status and valuations involves considerable judgment. Alliant Energy reviews the accounting for and subsequent valuation of its derivative instruments on an ongoing basis.

Unbilled Revenues - Alliant Energy accrues revenues for utility services rendered but unbilled at month-end. The monthly accrual process includes the development of various significant estimates, including the amount of natural gas and electricity used by each customer class and the associated revenues generated. Significant fluctuations in energy demand for the unbilled period or changes in the composition of Alliant Energy's customer classes could impact the accuracy of the unbilled revenues estimate. Alliant Energy updates the calculation each month and performs a detailed review of the estimate each quarter.

Valuation of Assets - Alliant Energy's balance sheet has significant long-lived assets which are not subject to recovery under SFAS 71. As a result, Alliant Energy must generate future cash flows from such assets in a non-regulated environment to ensure the carrying value is not impaired.

Many of these assets are the result of capital investments which have been made in recent years and have not yet reached a mature life cycle. Alliant Energy assesses the carrying amount and potential impairment of these long-lived assets whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Factors Alliant Energy considers in determining if an impairment review is necessary include a significant underperformance of the assets relative to historical or projected future operating results, a significant change in Alliant Energy's use of the acquired assets or business strategy related to such assets and significant negative industry or economic trends. When Alliant Energy determines an impairment review is necessary, a comparison is 42 ALLIANT EN RGY 2001 ANNUAL REPORT

made between the expected undiscounted future cash flows and the carrying amount of the asset. If the carrying amount of the asset is the larger of the two balances, an impairment loss is recognized by the amount the carrying amount of the asset exceeds the fair value of the asset. The fair value is determined by the use of quoted market prices, appraisals or the use of valuation techniques such as expected discounted future cash flows. Alliant Energy must make assumptions regarding these estimated future cash flows and other factors to determine the fair value of the respective assets.

Alliant Energy's balance sheet includes investments in several available-for-sale securities accounted for in accordance with SFAS 115, "Accounting for Certain Investments in Debt and Equity Securities." Alliant Energy monitors any unrealized losses from such investments to determine if the loss is considered to be a temporary or permanent decline. The determination as to whether the investment is temporarily versus permanently impaired requires considerable judgment.

When the investment is considered permanently impaired, the previously recorded unrealized loss would be recorded directly to the income statement as a realized loss.

As a result of the adoption of SFAS 142 on January 1, 2002, Alliant Energy will be required to perform annual assessments of its goodwill for impairment by applying fair-value-based tests. Alliant Energy will be required to make various assumptions regarding these tests.

Environmental Contingencies - Alliant Energy has recorded various environmental liabilities as noted in Note 11(e) of the "Notes to Consolidated Financial Statements." Such environmental liabilities are estimated based upon historical experience and periodic analyses of its various environmental remediation sites. Such analyses estimate the environmental liability based on the best current estimate of the remaining amount to be incurred for investigation, remediation and monitoring costs for those sites where the investigation process has been or is substantially completed and the minimum of the estimated cost range for those sites where the investigation is in its earlier stages. It is possible that future cost estimates will be greater than current estimates as the investigation process proceeds, additional facts become known, or additional sites are identified and the liabilities are updated once such information becomes available. For Alliant Energy's utility subsidiaries, changes in cost estimates may be offset through rate recovery.

Other Future Considerations - In addition to items discussed earlier in MD&A, the following items could impact Alliant Energy's future financial condition or results of operations:

The initial five-year term of Alliant Energy's electricity-trading joint venture with Cargill expires in October 2002. On February 28, 2002, Alliant Energy received a notice from Cargill pursuant to the terms of the joint venture agreement that will result in the parties attempting to renegotiate the terms of the agreement. If such negotiations are unsuccessful, discussions regarding the sale of their share of the joint ven ture by one party to the other or the termination of the joint venture would commence. Alliant Energy would not expect to incur a material charge against earnings should the venture be terminated. At this time, Alliant Energy cannot predict the outcome of these discussions or the future of the venture.

Refer to "Results of Operations - Interest Expense and Other" for details of the pre-tax earnings Alliant Energy realized from the joint venture in 2001, 2000 and 1999.

Alliant Energy's pension and other postretirement benefit expenses for 2002 are expected to be approximately $21 million higher than in 2001, primarily due to unfavorable asset returns, a reduction in the discount rate used to value plan benefits and expected increases in retiree medical costs. The utility portion of these cost increases will be addressed in rate filings in Wisconsin, Iowa and with FERC in 2002.

While the value of Alliant Energy's investment in McLeod decreased significantly in 2001, the McLeod stock traded above Alliant Energy's basis in its investment in available-for-sale McLeod securities as late as the last week of November 2001.

McLeod announced in the first quarter of 2002 that it had filed a pre-negotiated plan of reorganization through a Chapter 11 bankruptcy petition. The trading of McLeod's common stock has subsequently been suspended by Nasdaq. Alliant Energy will be reviewing for the possible impairment of its investment in McLeod in the first quarter of 2002. Alliant Energy's basis in its available-for-sale McLeod securities is $28.4 million.

Refer to Note 9 of the "Notes to Consolidated Financial Statements" for discussion of how Alliant Energy accounts for its investment in McLeod.

At December 31, 2001, the carrying amount of the debt component of Resources' exchangeable senior notes was $56.1 million, consisting of the par value of $402.5 million, less unamortized debt discount of $346.4 million. The terms of the exchangeable senior notes require Resources to pay interest on the par value of the notes at 7.25% from February 2000 to February 2003, and at 2.5% thereafter until maturity in February 2030. As explained in Note 10(a) of the "Notes to Consolidated Financial Statements," Resources accounted for the net proceeds from the issuance of the notes as two separate components, a debt component and an embedded derivative component. In accordance with SFAS 133, Alliant Energy determined the initial carrying value of the debt component by ALLIANT ENERGY 2001 ANNUAL REPORT 43

Management's Discussion and Analysis of Financial Condition and Results of Operations (continued) subtracting the fair value of the derivative component from the net proceeds realized from the issuance of the exchangeable senior notes. This resulted in a very low initial carrying amount of the debt component which results in the recording of interest expense at an effective rate of 26.8% of the carrying amount of the debt component. For 2001, interest expense on the notes was $16.9 million. Interest payments in excess of interest expense are recorded as a reduction of the carrying amount of the debt component. As a result of the higher interest payments for the first three years, the carrying amount of the debt component will decline until it reaches $37.8 million in February 2003, and will then gradually increase over the next 27 years to the ultimate repayment amount of $402.5 million in 2030. Interest expense on the debt component of the notes will be $13.2 million, $10.2 million and $10.2 million in 2002, 2003 and 2004, respectively. The repayment terms of the exchangeable senior notes are not affected by the recent bankruptcy filing of McLeod. If the existing McLeod shares should be cancelled upon emergence from bankruptcy, the notes would remain outstanding until maturity.

At December 31, 2001 and 2000, Resources had a loan receivable (including accrued interest income] from a Mexican development company of $41 million and $18 million, respectively. Under provisions of the loan, Resources has agreed to lend up to $65 million to support the development of a resort community near the Baja peninsula in Mexico. The loan accrues interest at 8.75%/o and is secured by the undeveloped land of the resort community. Repayment of the loan principal and interest will be based on a portion of the proceeds received from the sales of real estate in the resort community and therefore is dependent on the successful development of the project and the ability to sell real estate.

Alliant Energy may also realize royalty income on the real estate sales once the loan is repaid.

In October 2001, Alliant Energy announced an agreement with Panda Energy International, Inc. (Panda Energy), to jointly develop and operate a 1,100 MW natural gas combined-cycle power plant in western Michigan. Construction of the facility is currently delayed due to construction costs and project timing, but development activities for the facility continue.

Alliant Energy will only execute the Panda Energy and other non-regulated generation projects if management believes Alliant Energy's required returns on the projects can be achieved. The generation market has experienced dramatic volatility recently and Alliant Energy believes it will be better positioned by being diligent and patient in waiting for the right opportunities to build its portfolio of non-regulated generation projects. Alliant Energy has made payments of $54 million for turbines and related equipment at December 31, 2001 which are included in Non-regulated and other property, plant and equipment on the Consolidated Balance Sheets. Alliant Energy has also entered into commitments for an additional $178 million and expects to use such turbines and related equipment for the Panda Energy and/or other generation projects.

Alliant Energy has also incurred approximately $7 million of development costs related to the Panda Energy project and the majority of such costs would have to be written off should the project ultimately be canceled.

Alliant Energy has a $10 million investment in Enermetrix, Inc., an energy technology start-up enterprise, that is accounted for under the cost method. The Board of Directors of Enermetrix, Inc. has been undergoing discussions during 2002 as to the strategic options for the future of the business, including certain business combinations, various company restructurings, continuing the business as-is or liquidating the company. Alliant Energy is currently unable to predict the outcome of such discussions but it will be performing an impairment review of this investment in the first quarter of 2002. As a result, Alliant Energy could incur a charge as soon as the first quarter of 2002 based on the outcome of the Enermetrix, Inc. Board decisions or the impairment review.

Alliant Energy has a $10 million investment in Capstone Turbine Corporation (Capstone), a publicly-traded microturbine producer, that is accounted for under the cost method. The common stock of Capstone has traded below Alliant Energy's cost basis of $6.67 per share since late September 2001. As a result, Alliant Energy could incur a charge as soon as the first quarter of 2002 for an other-than-temporary decline in the value of its Capstone investment.

The carrying values of Alliant Energy's oil and gas properties can be particularly sensitive to pricing changes in the near term. Such carrying values are also impacted by, among other things, production rates, production costs and acquisitions and sales of properties. Based on recent gas prices, Alliant Energy could incur impairment charges on its gas properties as soon as the first quarter of 2002.

WP&L has provided energy conservation services to its customers for many years through a program called Shared Savings. WP&L earns incentives that are recoverable in rates for assisting customers that make building or equipment improvements to reduce energy usage. As a result of legislative changes, this program may be reduced or eliminated in Wisconsin effective January 1, 2003. Alliant Energy is aggressively pursuing both regulatory and legislative changes to retain some or all of the net income from this program in Wisconsin.

If such efforts are unsuccessful, Alliant Energy would experience a reduction in net income in 2003 of approximately $0.10 per share compared to income realized in 2001. Alliant Energy is also pursuing the development of additional demand-side management related programs within Alliant Energy's service territory to replace or increase this net income.

Alliant Energy realized $6.6 million of tax credits from its oil and gas business in 2001. Based on current tax legislation, such credits will no longer be available effective January 1, 2003.

44 ALLIANT ENERGY 2001 ANNUAL REPORT

Report on the Financial Information Alliant Energy Corporation management is responsible for the information and representations contained in the financial statements and in other sections of this Annual Report. The consolidated financial statements that follow have been prepared in accordance with accounting principles generally accepted in the United States. In addition to selecting appropriate accounting principles, management is responsible for the manner of presentation and for the reliability of the financial information. In fulfilling that responsibility, it is necessary for management to make estimates based on currently available information and judgments of current conditions and circumstances.

Through a well-developed system of internal controls, management seeks to ensure the integrity and objectivity of the financial information presented in this report. This system of internal controls is designed to provide reasonable assurance that the assets of the company are safeguarded and that the transactions are executed according to management's authorizations and are recorded in accordance with the appropriate accounting principles.

The Board of Directors participates in the financial information reporting process through its Audit Committee.

Erroll B. Davis, Jr.

Chairman, President and Chief Executive Officer Thomas M. Walker Executive Vice President and Chief Financial Officer John E. Kratchmer Corporate Controller and Chief Accounting Officer January 25, 2002 Report of Independent Public Accountants To the Shareowners of Alliant Energy Corporation:

We have audited the accompanying consolidated balance sheets and statements of capitalization of Alliant Energy Corporation (a Wisconsin Corporation) and subsidiaries as of December 31, 2001 and 2000, and the related consolidated statements of income, cash flows and changes in common equity for each of the three years in the period ended December 31, 2001. These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted in the United States. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of Alliant Energy Corporation and subsidiaries as of December 31, 2001 and 2000, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2001, in conformity with accounting principles generally accepted in the United States.

ARTHUR ANDERSEN LLP Milwaukee, Wisconsin January 25, 2002 ALLIANT ENERGY 2001 ANNUAL REPORT 45

Consolidated Financial Statements Consolidated Statements of Income Year Ended December 31, 2001 2000 1999 (in thousands, except per share amounts)

Operating revenues:

Electric utility

$1,756,556

$1,648,036

$1,548,938 Gas utility 487,877 414,948 314,319 Non-regulated and other 532,907 342,000 264,716 2,777,340 2,404,984 2,127,973 Operating expenses:

Electric and steam production fuels 310,689 288,621 262,305 Purchased power 403,166 294,818 255,446 Cost of utility gas sold 360,911 278,734 180,519 Other operation and maintenance 887,733 734,675 669,111 Depreciation and amortization 334,149 322,334 279,088 Taxes other than income taxes 110,668 104,746 104,969 2,407,316 2,023,928 1,751,438 Operating income 370,024 381,056 376,535 Interest expense and other:

Interest expense 190,472 173,614 136,229 Equity income from unconsolidated investments (35,882)

(19,138)

(3,008)

Allowance for funds used during construction (11,144)

(8,761)

(7,292)

Preferred dividend requirements of subsidiaries 6,720 6,713 6,706 Gain on reclassification of investments (321,349)

Gains on sales of McLeodUSA Inc. stock (23,773)

(40,272)

Miscellaneous, net (25,212)

(47,020)

(32,895) 124,954 (239,714) 59,468 Income before income taxes 245,070 620,770 317,067 Income taxes 59,840 238,816 120,486 Income before cumulative effect of a change in accounting principle, net of tax 185,230 381,954 196,581 Cumulative effect of a change in accounting principle, net of tax (12,868) 16,708 Net income

$172,362

$398,662

$196,581 Average number of common shares outstanding - basic 80,498 79,003 78,352 Earnings per average common share - basic:

Income before cumulative effect of a change in accounting principle

$2.30

$4.84

$2.51 Cumulative effect of a change in accounting principle (0.16) 0.21 Net income

$2.14

$5.05

$2.51 Average number of common shares outstanding - diluted 80,636 79,193 78,395 Earnings per average common share - diluted:

Income before cumulative effect of a change in accounting principle

$2.30

$4.82

$2.51 Cumulative effect of a change in accounting principle (0.16) 0.21 Net income

$2.14

$5.03

$2.51 Dividends declared per common share

$2.00

$2.00

$2.00 The accompanying Notes to Consolidated Financial Statements are an integral part of these statements.

46 ALLIANT.NERGY 2001 ANNUAL REPORT

Consolidated Balance Sheets ASSETS Property, plant and equipment:

Utility:

Electric plant in service Gas plant in service Other plant in service Accumulated depreciation Net plant Construction work in progress Nuclear fuel, net of amortization Other, net Total utility Non-regulated and other:

Investments:

Whiting (oil and gas)

Affordable housing, transportation and other International Integrated Services Non-regulated generation, Corporate Services and other Accumulated depreciation, depletion and amortization Total non-regulated Current assets:

Cash and temporary cash investments Restricted cash Accounts receivable:

Customer, less allowance for doubtful accounts of $8,598 and $3,762, respectively Unbilled utility revenues Other, less allowance for doubtful accounts of $319 and $484, respectively Notes receivable, less allowance for doubtful accounts of $386 and $484, respectively Production fuel, at average cost Materials and supplies, at average cost Gas stored underground, at average cost Other Investments:

Investments in unconsolidated foreign entities Nuclear decommissioning trust funds Investment in available-for-sale securities of McLeodUSA Inc.

Investment in trading securities of McLeodUSA Inc.

Other Other assets:

Regulatory assets Deferred charges and other Total assets The accompanying Notes to Consolidated Financial Statements are an integral part of these statements.

ALIJANT ENERGY 2001 ANNUAL REPORT 47 December 31, 2fi1ll nnn (in thousands)

$5,123,781 597,494 517,938 (3,374,867) 2,864,346 111,069 54,811 7,383 3,037,609 396,860 253,121 169,522 104,740 116,229 (215,284) 825,188 3,862,797 86,618 43,726 66,192 71,388 73,855 13,650 54,707 54,401 57,114 105,191 626,842 572,555 332,953 14,954 5,785 228,274 1,154,521 241,973 361,549 603,522

$6,247,682

$5,203,069 574,390 474,116 (3,296,546) 2,955,029 130,856 61,935 6,834 3,154,654 353,372 255,953 52,627 100,692 8,646 (206,637) 564,653 3,719,307 148,415 3,512 122,895 124,515 45,829 9,968 46,627 55,930 41,359 111,931 710,981 507,655 307,940 569,951 220,912 132,203 1,738,661 270,779 294,038 564,817

$6,733,766

  • I*1

?NAN

Consolidated Financial Statements (continued)

Consolidated Balance Sheets I_&PlTAI 17ATIflN ANfl LIABILITIES Capitalization (See Consolidated Statements of Capitalization):

Common stock Additional paid-in capital Retained earnings Accumulated other comprehensive income (loss)

Shares in deferred compensation trust Total common equity Cumulative preferred stock of subsidiaries, net Long-term debt (excluding current portion)

Current liabilities:

Current maturities and sinking funds Variable rate demand bonds Commercial paper Notes payable Other short-term borrowings Accounts payable Accrued taxes Other Other long-term liabilities and deferred credits:

Accumulated deferred income taxes Accumulated deferred investment tax credits Pension and other benefit obligations Environmental liabilities Derivative liability Other Minority interest Commitments and contingencies (Note 11)

Total capitalization and liabilities 2001

$897 1,239,793 832,293 (152,434)

(2,208) 1,918,341 113,953 2,457,941 4,490,235 10,506 55,100 68,389 15 84,318 245,480 90,413 185,516 739,737 632,472 59,398 96,496 49,144 358 136,464 974,332 43,378

$6,247,682 December 31, 2000 (in thousands)

$790 947,504 818,162 271,867 (851) 2,037,472 113,790 1,910,116 4,061,378 92,477 55,100 283,885 50,067 110,783 296,959 87,484 177,580 1,154,335 931,675 67,364 65,399 64,532 181,925 183,817 1,494,712 23,341

$6,733,766 The accompanying Notes to Consolidated Financial Statements are an integral part of these statements.

48 AILIANT ENERGY 2001 ANNUAL REPORT CAPITALIZATION AND LIABILITIES

Consolidated Statements of Cash Flows 2001 Cash flows from operating activities:

Net income Adjustments to reconcile net income to net cash flows from operating activities:

Depreciation and amortization Amortization of nuclear fuel Amortization of deferred energy efficiency expenditures Deferred tax expense (benefits) and investment tax (credits)

Gains on dispositions of assets, net Equity income from unconsolidated investments, net Distributions from equity method investments Non-cash valuation charges from exchangeable senior notes and McLeodUSA Inc. trading securities Cumulative effect of a change in accounting principle, net of tax Gain on reclassification of investments Other Other changes in assets and liabilities:

Accounts receivable Income tax refunds receivable Gas stored underground Accounts payable Manufactured gas plants insurance refunds Benefit obligations and other Net cash flows from operating activities Cash flows from financing activities:

Common stock dividends declared Proceeds from issuance of common stock Net change in Resources' credit facility Proceeds from issuance of exchangeable senior notes Proceeds from issuance of other long-term debt Reductions in other long-term debt Net change in other short-term borrowings Other Net cash flows from financing activities Cash flows used for investing activities:

Construction and acquisition expenditures:

Regulated domestic utilities Non-regulated businesses and other Nuclear decommissioning trust funds Proceeds from formation of ATC and other asset dispositions Other Net cash flows used for investing activities Net increase (decrease) in cash and temporary cash investments Cash and temporary cash investments at beginning of period Year Ended December 31, 2000 (in thousands)

$172,362 334,149 17,256 17,032 (3,606)

(16,119)

(35,882) 18,021 33,561 12,868 (9,539) 81,804 (11,735)

(15,755)

(56,848)

(21,541)

(35,740) 480,288 (158,231) 288,553 63,110 519,543 (147,261)

(332,037)

(32,449) 201,228 (340,789)

(477,574)

(22,100) 127,810 (30,660)

(743,313)

(61,797) 148,415 Cash and temporary cash investments at end of period

$86,618 Supplemental cash flow information:

Cash paid during the period for:

Interest

$186,706 Income taxes

$67,564 Noncash investing and financing activities:

Capital lease obligations incurred and other

$19,967 The accompanying Notes to Consolidated Financial Statements are an integral part of these statements.

$398,662 322,334 18,933 25,609 115,045 (43,148)

(19,138) 8,032 707 (16,708)

(321,349)

(1,821) 1999

$196,581 279,088 17,494 25,435 (16,258)

(61,667)

(3,008) 2,828 2,036 (147,812)

(16,407)

(3,128) 215 (18,208) 2,862 105,810 (13,148) 16,061 9,906 439,881 425,957 (157,964) 1,069 181,652 402,500 121,525 (64,837) 156,990 (31,244) 609,691 (304,656)

(761,808)

(22,100) 111,509 (37,771)

(1,014,826) 34,746 113,669

$148,415

$163,728

$116,895

$20.419 (156,489) 36,491 (113,657) 281,299 (95,520) 169,587 (18,618) 103,093 (285,668)

(192,905)

(22,100) 93,443 (39,978)

(447,208) 81,842 31,827

$113,669

$130,214

$141,150

$25,040 ALLIANT ENERGY 2001 ANNUAL REPORT 49

Consolidated Financial Statements (continued)

Consolidated Statements of Capitalization December 31, 2001 2000 (in thousands, except share amounts)

Common equity:

Common stock- $0.01 par value - authorized 200,000,000 shares; outstanding 89,682,334 and 79,010,114 shares, respectively Additional paid-in capital Retained earnings Accumulated other comprehensive income (loss)

Shares in deferred compensation trust - 71,958 and 28,825 shares at an average cost of $30.68 and $29.52 per share, respectively Total common equity Cumulative preferred stock of subsidiaries, net (Note 7(b))

Long-term debt:

First Mortgage Bonds:

8-5/8% to 9-1/8%, retired in 2001 9.3%, retired in 2001 7.75%, due 2004 1.9% variable rate at December 31, 2001 to 7.6%, due 2005 7-1/4% to 8%, due 2007, partially retired in 2001 1.7% variable rate at December 31, 2001, due 2014 1.85% to 1.9% variable rate at December 31, 2001, due 2015 8-5/8%, due 2021, partially retired in 2001 7-5/8%, due 2023 8.6%, due 2027, partially retired in 2001 Collateral Trust Bonds:

7.25%, due 2006 6-7/8%, due 2007 6%, due 2008 5.5% to 7%, due 2023 Pollution Control Revenue Bonds:

1.8% variable rate at December 31, 2001 to 6.35%, due 2002 to 2023 Other long-term debt.

Senior notes, 7% to 8.59%, due 2004 to 2011 Exchangeable senior notes, 7.25% through February 2003, 2.5% thereafter, due 2030 Credit facility, 3% to 3.45% at December 31, 2001 Senior debentures, 6-5/8% to 6-3/4%, due 2009 to 2011 Debentures, 5.71% to 7-5/8%, due 2007 to 2010 Subordinated deferrable interest debentures, 7-7/8%, due 2025 Multifamily housing revenue bonds, 1.8% variable rate at December 31, 2001 to 7.55%, due 2002 to 2036 Other, 0% to 10.75%, due 2002 to 2045 Less:

Current maturities Variable rate demand bonds Unamortized debt discount, net Total long-term debt (excluding current portion)

Total capitalization The accompanying Notes to Consolidated Financial Statements are an integral part of these statements.

50 ALLIANT ENERGY 2001 ANNUAL REPORT

$897 1,239,793 832,293 (152,434)

(2,208) 1,918,341 113,953 62,000 88,000 52,450 8,500 30,600 20,000 94,000 70,000 425,550 60,000 55,000 50,000 69,400 234,400 51,490 574,000 402,500 383,610 335,000 265,000 50,000 38,916 116,814 2,877,280 (10,506)

(55,100)

(353,733) 2,457,941

$4,490,235

$790 947,504 818,162 271,867 (851) 2,037,472 113,790 81,000 27,000 62,000 88,000 55,000 8,500 30,600 25,000 94,000 90,000 561,100 60,000 55,000 50,000 69,400 234,400 52,050 274,000 402,500 320,500 135,000 265,000 50,000 33,366 71,793 2,399,709 (92,477)

(55,100)

(342,016) 1,910,116

$4,061,378

Consolidated Statements of Changes in Common Equity Common Stock 1999:

Beginning balance (a)

Net income Unrealized holding gains arising during period, net of tax of $351,314 Less: reclassification adjustment for gains included in net income, net of tax of $14,986 Net unrealized gains on securities Foreign currency translation adjustments Total comprehensive income Common stock dividends Common stock issued Ending balance Additional Paid-In Capital Accumulated Other Retained Comprehensive Earnings Income (Loss)

Shares in Deferred Compensation Trust Tota I Common Equity (in thousands)

$776

$905,130

$537,372 196,581 (156,489) 14 37,278 790 942,408 577,464

$163,017 499,668

$1,606,295 196,581 499,668 25,286 25,286 474,382 474,382 (2,496)

(2,496) 668,467 (156,489) 37,292 634,903 2,155,565 2000:

Net income Unrealized holding losses arising during period, net of tax of ($77,853)

Less: adjustment for gain on reclassification of investments included in net income, net of tax of $134,053 Less: reclassification adjustment for other gains included in net income, net of tax of $8,426 Net unrealized losses on securities Foreign currency translation adjustments Unrealized holding losses arising during period due to cumulative effect of a change in accounting principle, net of tax of ($4,693)

Other unrealized holding losses arising during period, net of tax of ($2,560)

Less: reclassification adjustment for losses included in net income, net of tax of ($4,502)

Net unrealized losses on qualifying derivatives Total comprehensive income Common stock dividends Common stock issued Ending balance 398.662 (105,292) 187,296 16,370 (308,958)

(50,400) 398,662 (105,292) 187,296 16,370 (308,958)

(50,400)

(6,582)

(3,427)

(157,964) 5,096 790 947,504 818,162 (6,582)

(3,427)

(6,331)

(6,331)

(3,678)

(3,678) 35,626 (157,964)

(851) 4,245 271,867 (851) 2,037,472 2001:

Net income Unrealized holding losses arising during period, net of tax of ($240,579)

Less: reclassification adjustment for gains included in net income, net of tax of $

Net unrealized losses on securities Foreign currency translation adjustments Minimum pension liability adjustments, net of tax of ($11,022)

Unrealized holding losses arising during period, net of tax of ($1,569)

Less: reclassification adjustment for losses 172,362 172,362 (343,285)

(343,285) 259 (343,544)

(66,830)

(16,378)

(1,003) 259 (343,544)

(66,830)

(16,378)

(1,003) incluoeo in net income, net of tax of ($,078)

(3,454)

(3,454)

Net unrealized gains on qualifying derivatives 2,451 2,451 Total comprehensive loss (251,939)

Common stock dividends (158,231)

(158,231)

Common stock issued 107 292,289 (1,357) 291,039 Ending balance

$897

$1,239,793

$832,293

($152,434)

($2,208)

$1,918,341 (a) Accumulated other comprehensive income (loss) at December 31, 1998 consisted of $170,099 of net unrealized gains on securities and ($7,082) of foreign currency translation adjustments.

The accompanying Notes to Consolidated Financial Statements are an integral part of these statements.

ALLIANT ENERGY 2001 ANNUAL REPORT 51

Notes to Consolidated Financial Statements (1)

SUMMARY

OF SIGNIFICANT ACCOUNTING POLICIES (a) General - The consolidated financial statements include the accounts of Alliant Energy and its consolidated subsidiaries. Alliant Energy is an investor-owned public utility holding company, whose primary subsidiaries are IP&L, WP&L, Resources and Corporate Services. On January 1, 2002, IPC merged with and into IESU and IESU changed its name to IP&L. lP&L and WP&L are utility subsidiaries that are engaged principally in the generation, transmission, distribution and sale of electric energy; the purchase, distribution, transportation and sale of natural gas; and steam and water services in Iowa, Wisconsin, Minnesota and Illinois.

Resources (through its numerous direct and indirect subsidiaries) is comprised of various business units:

International, Integrated Services, Investments, Non-regulated Generation and Trading, Mass Marketing and Energy Technologies. International holds interests in global partnerships to develop energy generation, delivery and infrastructure in growing international markets, including Australia, Brazil, China and New Zealand. Integrated Services provides a wide range of energy and environmental services for commercial, industrial, institutional, educational and governmental customers. Investments includes ownership of an oil and gas production company, transportation companies, affordable-housing properties and various other investments.

Non-regulated Generation and Trading plans to acquire and construct a portfolio of domestic non-regulated generation assets and holds Alliant Energy's electricity-trading joint venture with Cargill. Mass Marketing focuses on developing and marketing energy-related products and services. Energy Technologies holds investments in emerging energy technology companies. Corporate Services is the subsidiary formed to provide administrative services to Alliant Energy and its subsidiaries as required under PUHCA.

The consolidated financial statements reflect investments in controlled subsidiaries on a consolidated basis. All significant intercompany balances and transactions, other than certain energy-related transactions affecting the utility subsidiaries, have been eliminated from the consolidated financial statements. Such energy-related transactions are made at prices that approximate market value and the associated costs are recoverable from customers through the rate making process. The consolidated financial statements are prepared in conformity with accounting principles generally accepted in the U.S., which give recognition to the rate making and accounting practices of FERC and state commissions having regulatory jurisdiction. The preparation of the consolidated financial statements requires management to make estimates and assumptions that affect: a) the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements; and b) the reported amounts of revenues and expenses during the reporting period.

Actual results could differ from those estimates. Certain prior period amounts have been reclassified on a basis consistent with the current year presentation.

Unconsolidated investments for which Alliant Energy has at least a 20 percent non-controlling voting interest are generally accounted for under the equity method of accounting. These investments are stated at acquisition cost, increased or decreased for Alliant Energy's equity in net income or loss, which is included in "Equity income from unconsolidated investments" in the Consolidated Statements of Income and decreased for any dividends received. These investments are also increased or decreased for Alliant Energy's proportionate share of other comprehensive income, which is included in "Accumulated other comprehensive income (loss)" on the Consolidated Balance Sheets. Investments that do not meet the criteria for consolidation or the equity method of accounting are accounted for under the cost method. Refer to Note 9 for discussion of Alliant Energy's cost method investments that are marked-to-market as a result of SFAS 115, "Accounting for Certain Investments in Debt and Equity Securities."

(b) Regulation - Alliant Energy is a registered public utility holding company subject to regulation by the SEC under PUHCA. The utility subsidiaries are subject to regulation under PUHCA, FERC and their respective state regulatory commissions (IUB, PSCW, MPUC and ICC).

(c) Regulatory Assets - Alliant Energy is subject to the provisions of SFAS 71, "Accounting for the Effects of Certain Types of Regulation," which provides that rate-regulated public utilities record certain costs and credits allowed in the rate making process in different periods than for non-regulated entities. These are deferred as regulatory assets or accrued as regulatory liabilities and are recognized in the Consolidated Statements of Income at the time they are reflected in rates. At December 31, 2001 and 2000, regulatory assets were comprised of the following items (in millions):

Tax-related (Note 1(d))

Environmental liabilities (Note 1 1(e))

Energy efficiency program costs Other 2001

$115.3 63.1 39.9 41.3

$259.6 2000

$154.2 66.8 51.6 27.5

$300.1 52 ALLIANT ENERGY 2001 ANNUAL REPORT

If a portion of the utility subsidiaries' operations becomes no longer subject to the provisions of SFAS 71 as a result of competitive restructuring or otherwise, a write-down of related regulatory assets would be required, unless some form of transition cost recovery is established by the appropriate regulatory body that would meet the requirements under accounting principles generally accepted in the U.S. for continued accounting as regulatory assets during such recovery period. In addition, each utility subsidiary would be required to determine any impairment of other assets and write-down such assets to their fair value.

(d) Income Taxes - Alliant Energy follows the liability method of accounting for deferred income taxes, which requires the establishment of deferred tax assets and liabilities, as appropriate, for all temporary differences between the tax basis of assets and liabilities and the amounts reported in the consolidated financial statements. Deferred taxes are recorded using currently enacted tax rates.

Except as noted below, income tax expense includes provisions for deferred taxes to reflect the tax effects of temporary differences between the time when certain costs are recorded in the accounts and when they are deducted for tax return purposes. As temporary differences reverse, the related accumulated deferred income taxes are reversed to income. Investment tax credits have been deferred and are subsequently credited to income over the average lives of the related property. Tax credits reduce income tax expense in the year claimed and include affordable housing and oil, gas and alternate fuel tax credits.

Consistent with Iowa rate making practices for IP&L, deferred tax expense is not recorded for certain temporary differences (primarily related to utility property, plant and equipment). As the deferred taxes become payable (over periods exceeding 30 years for some generating plant differences) they are recovered through rates. Accordingly, IP&L has recorded deferred tax liabilities and regulatory assets for certain temporary differences, as identified in Note 1(c). In Wisconsin, the PSCW has allowed rate recovery of deferred taxes on all temporary differences since August 1991. WP&L established a regulatory asset associated with those temporary differences occurring prior to August 1991 that will be recovered in future rates through 2007.

(e) Common Shares Outstanding - A reconciliation of the weighted average common shares outstanding used in the basic and diluted earnings per share calculation was as follows:

Weighted average common shares outstanding:

2001 2000 1999 Basic earnings per share calculation 80,497,823 79,002,643 78,352,186 Effect of dilutive securities 138,006 190,134 42,961 Diluted earnings per share calculation 80,635,829 79,192,777 78,395,147 In 2001, 2000 and 1999, 1,501,854, 1,358,597, and 1,275,355 options, respectively, to purchase shares of common stock, with average exercise prices of $31.08, $30.27, and $30.55, respectively, were excluded from the calculation of diluted earnings per share as the exercise prices were greater than the average market price.

(f) Temporary Cash Investments and Restricted Cash - Temporary cash investments are stated at cost, which approximates market value, and are considered cash equivalents for the Consolidated Balance Sheets and the Consolidated Statements of Cash Flows. These investments consist of short-term liquid investments that have maturities of less than 90 days from the date of acquisition.

At December 31, 2001, restricted cash of approximately $51 million ($44 million was classified as current and $7 million as long-term) consisted of $34 million related to borrowing requirements for the construction of various power plants in China; $ 11 million related to bond and regulatory reserves, escrows and tenant security deposits at Alliant Energy's affordable housing companies; and $6 million related to future oil and gas acquisitions at Whiting.

(g) Depreciation of Utility Property, Plant and Equipment - The utility subsidiaries use a combination of remaining life, straight-line and sum-of-the-years-digits depreciation methods as approved by their respective regulatory commissions. The remaining life of DAEC, of which IP&L is a co-owner, is based on the NRC license end-of-life of 2014. The remaining depreciable life of Kewaunee, of which WP&L is a co-owner, is based on the PSCW approved revised end-of-life of 2010. Depreciation expense related to the decommissioning of DAEC and Kewaunee is discussed in Note 11(fl. The average rates of depreciation for electric and gas properties, consistent with current rate making practices, were as follows:

ALLIANT ENERGY 2001 ANNUAL REPORT 53

Notes to Consolidated Financial Statements (continued)

IESU 2001 2000 1999 3.5%

3.5%

3.6%

3.5%

3.5%

3.5%

WP&L 2001 2000 1999 3.7%

3.6%

3.6%

4.1%

4.1%

3.9%

IPC 2001 2000 1999 3.5%

3.5%

3.6%

3.6%

3.6%

3.6%

(h) Property, Plant and Equipment - Utility plant (other than acquisition adjustments) is recorded at original cost, which includes overhead, administrative costs and AFUDC. At December 31, 2001 and 2000, IESU had $23.2 million and

$24.4 million, respectively, of acquisition adjustments, net of accumulated amortization, included in utility plant ($5.2 million and $5.5 million, respectively, of such balances are currently being recovered in IP&L's rates). The aggregate gross AFUDC recovery rates, computed in accordance with the prescribed regulatory formula, were as follows:

IESU WP&L IPC 2001 8.5%

7.9%

4.4%

2000 6.6%

10.8%

6.5%

1999 7.9%

5.4%

5.3%

Non-regulated property, plant and equipment is recorded at original cost. Upon retirement or sale of property and equipment, the cost and related accumulated depreciation are removed from the accounts and any gain or loss is included in "Miscellaneous, net" in the Consolidated Statements of Income.

Ordinary retirements of utility plant, including removal costs less salvage value, are charged to accumulated depreciation upon removal from utility plant accounts and no gain or loss is recognized.

(i) Operating Revenues - Alliant Energy accrues revenues for services rendered but unbilled at month-end. In 2000 and 1999, Alliant Energy recorded increases of $10 million (WP&L) and $9 million (IESU and IPC), respectively, in the estimate of utility services rendered but unbilled at month end due to the implementation of refined estimation processes.

(j) Utility Fuel Cost Recovery - IP&L's retail tariffs provide for subsequent adjustments to its electric and natural gas rates for changes in the cost of fuel, purchased energy and natural gas purchased for resale. Changes in the under/over collection of these costs are reflected in "Electric and steam production fuels" and "Cost of utility gas sold" in the Consolidated Statements of Income. The cumulative effects are reflected on the Consolidated Balance Sheets as a current asset or current liability, pending automatic reflection in future billings to customers. At IP&L, purchased-power capacity costs are not recovered from electric customers through EACs.

Recovery of these costs must be addressed in base rates in a formal rate proceeding.

WP&L's retail electric rates are based on annual forecasted fuel and purchased-power costs. Under PSCW rules, WP&L can seek emergency rate increases if the annual costs are more than three percent higher than the estimated costs used to establish rates. Any collections in excess of costs incurred in 2001 will be refunded in 2002, with interest. Accordingly, WP&L established a reserve in 2001 due to overcollection of fuel and purchased-power costs. WP&L has a gas performance incentive which includes a sharing mechanism whereby 40 percent of all gains and losses relative to current commodity prices, as well as other benchmarks, are retained by WP&L, with the remainder refunded to or recovered from customers.

(k) Nuclear Refueling Outage Costs - The IUB allows IP&L to collect, as part of its base revenues, funds to offset other operation and maintenance expenditures incurred during refueling outages at DAEC. As these revenues are collected, an equivalent amount is charged to other operation and maintenance expense with a corresponding credit to a reserve.

During a refueling outage, the reserve is reversed to offset the refueling outage expenditures. Operating expenses incurred during refueling outages at Kewaunee are expensed by WP&L as incurred. Scheduled refueling outages occurred at DAEC and Kewaunee in Spring and late 2001, respectively. The next scheduled refueling outages at DAEC and Kewaunee are anticipated to commence in Spring 2003.

(1) Nuclear Fuel - Nuclear fuel for DAEC is leased. Annual nuclear fuel lease expenses include the cost of fuel, based on the quantity of heat produced for the generation of electricity, plus the lessor's interest costs related to fuel in the reactor and administrative expenses. Nuclear fuel for Kewaunee is recorded at its original cost and is amortized to expense based upon the quantity of heat produced for the generation of electricity.

This accumulated amortization assumes spent nuclear fuel will have no residual value. Estimated future disposal costs of such fuel are expensed based on KWhs generated.

(i) Translation of Foreign Currency - Assets and liabilities of international investments, where the local currency is the functional currency, have been translated at year-end exchange rates and related income statement results have been translated using average exchange rates prevailing during the year. Adjustments resulting from translation have been recorded in "Accumulated other comprehensive income (loss)."

54 ALLIANT ENERGY 2001 ANNUAL REPORT Electric Gas

ALLIANT ENERGY 2001 ANNUAL REPORT (n) Derivative Financial Instruments - Alliant Energy uses derivative financial instruments to hedge exposures to fluctuations in interest rates, certain commodity prices and volatility in a portion of natural gas sales volumes due to weather. Alliant Energy also utilizes derivatives to mitigate the equity price volatility associated with certain investments in equity securities. Alliant Energy does not use such instruments for speculative purposes. The fair value of all derivatives are recorded as assets or liabilities on the Consolidated Balance Sheets and gains and losses related to derivatives that are designated as, and qualify as hedges, are recognized in earnings when the underlying hedged item or physical transaction is recognized in income. Gains and losses related to derivatives that do not qualify for, or are not designated in hedge relationships, are recognized in earnings immediately.

Alliant Energy has a number of commodity purchase and sales contracts that have been designated, and qualify for, the normal purchase and sale exception in SFAS 138, "Accounting for Certain Derivative Instruments and Certain Hedging Activities - an Amendment of SFAS 133." Based on this designation, these contracts are not accounted for as derivative instruments.

Alliant Energy is exposed to losses related to financial instruments in the event of counterparties' non-performance.

Alliant Energy has established controls to determine and monitor the creditworthiness of counterparties in order to mitigate its exposure to counterparty credit risk. In the fourth quarter of 2001, Alliant Energy recorded a pre-tax charge of

$5 million related to outstanding contracts with Enron. Alliant Energy has replaced certain Enron contracts by entering into contracts with credit-worthy counterparties where deemed necessary. Alliant Energy is not aware of any material exposure to counterparty credit risk.

Refer to Note 10 for further discussion of Alliant Energy's derivative financial instruments.

(o) Oil and Gas Producing Activities - Whiting follows the successful efforts method of accounting for its oil and gas properties. Under this method of accounting, all property acquisition costs and costs of exploratory and development wells are capitalized when incurred, pending determination of whether the well has found proved reserves. If an exploratory well has not found proved reserves, the costs of drilling the well and other associated costs are charged to expense. The costs of development wells are capitalized whether productive or non-productive.

Geological and geophysical costs on exploratory prospects and the costs of carrying and retaining unproved properties are expensed as incurred. An impairment is recorded to the extent that capitalized costs of unproved properties, on a field-by-field basis, are not considered to be realizable. Depletion, depreciation and amortization (DD&A) of capitalized costs of proved oil and gas properties is provided on a field-by-field basis using the units of production method based upon proved reserves. The computation of DD&A takes into consideration the anticipated proceeds from equipment salvage.

Whiting assesses its proved oil and gas properties for impairment whenever events or circumstances indicate that the carrying value of the assets may not be recoverable. The impairment test compares the expected undiscounted future net revenues on a field-by-field basis with the related net capitalized costs at the end of each period. When the net capitalized costs exceed the undiscounted future net revenues, the cost of the property is written down to fair value, which is determined using discounted future net revenues from the producing property. During 2001, 2000 and 1999, Whiting recorded impairment charges for proved properties of $0, $0 and $3.3 million, respectively.

Gains and losses are recognized on sales of entire interests in proved and unproved properties and are reported in "Miscellaneous, net." Sales of partial interests are generally treated as recoveries of costs.

(2) MERGER In April 1998, IES Industries Inc., WPL Holdings, Inc. and IPC completed a merger, accounted for as a pooling of interests, resulting in Alliant Energy. In association with the merger, Alliant Energy entered into a three-year consulting agreement, which expired in the second quarter of 2001, with Wayne Stoppelmoor, the Chief Executive Officer of IPC prior to the consummation of the merger. Under the terms of the agreement, Mr. Stoppelmoor, who was also Vice Chairman of Alliant Energy's Board of Directors until April 2000, received annual fees of $324,500, $324,500 and $200,000 for his services during the respective periods of the agreement.

(3) LEASES IP&L has a capital lease covering its 70 percent undivided interest in nuclear fuel purchased for DAEC. Annual nuclear fuel lease expenses (included in "Electric and steam production fuels" in the Consolidated Statements of Income) for 2001, 2000 and 1999 were $14.1 million, $16.0 million and $12.7 million, respectively. Alliant Energy's operating lease rental expenses, which include certain purchased-power operating leases, for 2001, 2000 and 1999 were $42.0 million, $25.2 million and $24.6 million, respectively. The purchased-power leases below include $33 million in 2003 and a total amount of

$423 million related to a new plant (Riverside) currently under development in Wisconsin, which is expected to be operational in 2003. At December 31, 2001, Alliant Energy's future minimum lease payments were as follows (in millions):

SALLIANT ENERGY 2001 ANNUAL REPORT 55

Notes to Consolidated Financial Statements (continued)

Operating leases:

Certain purchased-power agreements Financings using special purpose entities Other Total operating leases 2002 2003 2004 2005 2006 Thereafter Total

$18.3

$51.4

$65.8

$67.2

$68.5

$290.6

$561.8 2.7 2.7 2.7 2.7 2.7 15.7 29.2 24.8 25.7 24.3 20.4 15.1 35.8 146.1

$45.8

$79.8

$92.8

$90.3

$86.3

$342.1

$737.1 2002 2003 2004 2005 2006 Thereafter Capital leases

$17.3

$10.6

$8.9

$2.3

$1.8

$0.6 Alliant Energy has various synthetic leases related to the financing of its corporate headquarters, corporate aircraft, certain utility railcars and a utility radio dispatch system.

Certain financings involve the use of unconsolidated structured finance or special purpose entities. Based on the magnitude of the amounts shown in the above table in "Financings using special purpose entities," Alliant Energy believes these financings are not material to its liquidity or capital resources.

(4) UTJHTY ACCOUNTS RECEVABLE Utility customer accounts receivable, including unbilled revenues, arise primarily from the sale of electricity and natural gas. At December 31, 2001 and 2000, the utility subsidiaries were serving a diversified base of residential, commercial and industrial customers and did not have any significant concentrations of credit risk.

Alliant Energy's utility subsidiaries participate in a combined accounts receivable sale program whereby IP&L and WP&L may sell up to a combined maximum amount of $250 million (there are no individual limits) of their respective accounts receivable to a third-party financial institution on a limited recourse basis through wholly-owned and consolidated special purpose entities. Corporate Services acts as a collection agent for the buyer and receives a fee for collection services that approximates fair value. The agreement expires in April 2004 and is subject to annual renewal or renegotiation for a longer period thereafter. Under terms of the agreement, the third party financial institution purchases the receivables initially for the face amount. On a monthly basis, this sales price is adjusted, resulting in payments to the third-party financial institution of an amount that varies based on interest rates and length of time the sold receivables remain outstanding.

Collections on sold receivables are used to purchase additional receivables from the utility subsidiaries.

At December 31, 2001 and 2000, Alliant Energy had sold $178 million and $154 million of receivables, respectively. In 2001, 2000 and 1999, Alliant Energy received approximately $2.2 billion, $1.6 billion and $1.5 billion, respectively, in aggregate proceeds from the sale of accounts receivable. The utility subsidiaries use proceeds from the sale of accounts receivable and unbilled revenues to maintain flexibility in their capital structures, take advantage of favorable short-term rates and finance a portion of their long-term cash needs. Alliant Energy paid fees associated with these sales of $7.9 million,

$9.0 million and $7.1 million in 2001, 2000 and 1999, respectively.

Alliant Energy and its utility subsidiaries account for the sale of accounts receivable to the third-party financial institution as sales under SFAS 140, "Accounting for Transfers and Servicing of Financial Assets and Extinguishments of Liabilities."

Retained receivables are available to the third-party financial institution to pay any fees or expenses due it, and to absorb all credit losses incurred on any of the sold receivables.

56 ALLIANT ENERGY 2001 ANNUAL REPORT Less:

amount representing interest

$3.9 Total

$41.5 Present value of net minimum capital lease payments

$37.6

(5) INCOME TAXES The components of income taxes for Alliant Energy were as follows (in millions):

2001 2000 Current tax expense:

Federal State Deferred tax expense (benefit):

Federal State Foreign tax expense Amortization of investment tax credits Oil, gas and alternative fuel credits Affordable housing tax credits

$57.8 17.9 2.5 (5.6) 9.3 (5.2)

(7.1)

(9.8)

$59.8

$110.0 26.5 99.8 19.7 0.4 (4.5)

(6.2)

(6.9)

$238.8 1999

$116.9 29.2 (7.9)

(2.9)

(5.5)

(3.4)

(5.9)

$120.5 Included in "Cumulative effect of a change in accounting principle, net of tax" in the Consolidated Statements of Income for 2001 and 2000 was income tax expense (benefit) of ($5.5) million and $9.8 million, respectively, related to the adoption of SFAS 133 by an equity method foreign affiliate of Alliant Energy on January 1, 2001 and by Alliant Energy's consolidated subsidiaries on July 1, 2000, respectively.

The overall effective income tax rates shown in the following table were computed by dividing total income tax expense by income before income taxes and preferred dividend requirements of subsidiaries.

Statutory federal income tax rate State income taxes, net of federal benefits Effect of rate making on property related differences Amortization of investment tax credits Oil, gas and alternative fuel credits Affordable housing tax credits Adjustment of prior period taxes Other items, net Overall effective income tax rate 2001 2000 35.0%

35.0%

4.9 6.7 1.7 0.8 (2.2)

(0.9)

(2.8)

(1.0)

(3.6)

(1.1)

(8.4)

(1.0)

(0.8)

(0.4) 23.8%

38.1%

The accumulated deferred income tax (assets) and liabilities included on the Consolidated Balance Sheets at December 31 arise from the following temporary differences (in millions):

Property related Exchangeable senior notes McLeod investment Investment tax credits Other 2001

$608.9 129.7 2.0 (32.8)

(75.3)

$632.5 2000

$673.6 47.8 318.5 (45.8)

(62.4)

$931.7 At December 31, 2001, 2000 and 1999, Alliant Energy had not recorded U.S. tax provisions of approximately $6.7 million,

$4.4 million and $1.4 million, respectively, relating to approximately $19.0 million, $12.6 million and $4.1 million, respectively, of unremitted earnings from foreign investments as these earnings are expected to be reinvested indefinitely.

ALLIANT ENERGY 2001 ANNUAL REPORT 57 1999 35.0%

6.4 2.2 (1.7)

(1.0)

(1.9)

(1.7)

(0.1) 37.2%

Notes to Consolidated Financial Statements (continued)

Domestic and foreign sources of income before income taxes were as follows (in millions):

Domestic sources Foreign sources Income before income taxes 2001

$207.6 37.5

$245.1 2000

$607.7 13.1

$620.8 1999

$307.1 10.0

$317.1 (6) BENEFIT PLANS (a) Pension Plans and Other Postretirement Benefits - Alliant Energy has several non-contributory defined benefit pension plans that cover substantially all of its employees. Benefits are based on the employees' years of service and compensation.

Alliant Energy also provides certain postretirement health care and life benefits to eligible retirees. In general, the health care plans are contributory with participants' contributions adjusted regularly and the life insurance plans are non-contributory.

The weighted-average assumptions at the measurement date of September 30 were as follows:

Discount rate Expected return on plan assets Rate of compensation increase Medical cost trend on covered charges:

Initial trend rate Ultimate trend rate Qualified Pension Benefits 2001 2000 1999 7.25%

8.00%

7.75%

9%

9%

9%

3.5-4.5%

3.5-4.5%

3.5-4.5%

N/A N/A N/A N/A N/A N/A Other Postretirement Benefits 2001 2000 1999 7.25%

8.00%

7.75%

9%

9%

9%

3.5%

3.5%

3.5%

12%

50/6 9%

5%

7%

5%

The components of Alliant Energy's qualified pension benefits and other postretirement benefits costs were as follows (in millions):

20

$11 (48 Service cost Interest cost Expected return on plan assets Amortization of:

Transition obligation (asset)

Prior service cost Actuarial loss (gain)

Qualified Pension Benefits 01 2000 1.0

$11.1 8.2 36.7 8.5)

(45.7)

(2.4) 2.7 (1.5)

($0.5)

(2.4) 2.6 (1.0)

$1.3 Other Postretirement Benefits 2001 2000 1999

$4.0

$3.7

$5.5 10.6 9.8 10.4 (6.1)

(5.3)

(5.0) 1999

$12.8 35.6 (46.2)

(2.4) 2.5 0.2

$2.5 3.7 (0.3)

(1.5)

$10.4 3.9 (0.3)

(1.9)

$9.9 4.3 (0.3)

(0.8)

$14.1 The assumed medical trend rates are critical assumptions in determining the service and interest cost and accumulated postretirement benefit obligation related to postretirement benefit costs. A one percent change in the medical trend rates for 2001, holding all other assumptions constant, would have the following effects (in millions):

Effect on total of service and interest cost components Effect on postretirement benefit obligation 58 AL~IANT ENF RGY 2001 ANNUAL REPORT 1 Percent Increase

$1.5

$15.2 1 Percent Decrease

($1.4)

($13.7)

A reconciliation of the funded status of Alliant Energy's plans to the amounts recognized on Alliant Energy's Consolidated Balance Sheets at December 31 was as follows (in millions):

Qualified Pension Benefits Other Postretirement Benefits 2001 2000 2001 2000 Change in benefit obligation:

Net benefit obligation at beginning of year

$483.6

$481.0

$130.7

$127.8 Service cost 11.0 11.1 4.0 3.7 Interest cost 38.2 36.7 10.6 9.8 Plan participants' contributions 1.9 1.6 Plan amendments 3.6 (3.8)

Actuarial loss (gain) 56.6 (13.8) 40.7 2.4 Gross benefits paid (36.1)

(35.0)

(13.4)

(10.8)

Net benefit obligation at end of year 553.3 483.6 174.5 130.7 Change in plan assets:

Fair value of plan assets at beginning of year 556.3 525.9 83.0 68.3 Actual return on plan assets (36.9) 63.1 (6.8) 8.7 Employer contributions 2.3 9.1 15.2 Plan participants' contributions 1.9 1.6 Gross benefits paid (36.1)

(35.0)

(13.4)

(10.8)

Fair value of plan assets at end of year 483.3 556.3 73.8 83.0 Funded status at end of year (70.0) 72.7 (100.7)

(47.7)

Unrecognized net actuarial loss (gain) 74.2 (69.2) 16.8 (38.3)

Unrecognized prior service cost 21.5 24.2 (0.9)

(1.2)

Unrecognized net transition obligation (asset)

(3.3)

(5.8) 41.1 44.8 Net amount recognized at end of year

$22.4

$21.9

($43.7)

($42.4)

Amounts recognized on the Consolidated Balance Sheets consist of:

Prepaid benefit cost

$45.5

$41.8

$2.1

$1.6 Accrued benefit cost (23.1)

(19.9)

(45.8)

(44.0)

Additional minimum liability (36.1)

Intangible asset 8.7 Accumulated other comprehensive loss 27.4 Net amount recognized at measurement date 22.4 21.9 (43.7)

(42.4)

Contributions paid after 9/30 and prior to 12/31 2.5 1.5 Net amount recognized at 12/31

$22.4

$21.9

($41.2)

($40.9)

The benefit obligation and fair value of plan assets for the postretirement welfare plans with benefit obligations in excess of plan assets were $167.8 million and $64.5 million, respectively, at September 30, 2001 and $124.5 million and $73.2 million, respectively, at September 30, 2000. The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the qualified pension plans with accumulated benefit obligations in excess of plan assets were $293.9 million, $283.7 million and $225.7 million, respectively, at September 30, 2001. At September 30, 2000, there were no qualified pension plans with accumulated benefit obligations in excess of plan assets. For the various Alliant Energy pension anfd postretirement plans, Alliant Energy common stock represented less than 1 percent of total plan investments at December 31, 2001 and 2000.

ALLIANT ENERGY 2001 ANNUAL REPORT 59

Notes to Consolidated Financial Statements (continued)

Alliant Energy sponsors several non-qualified pension plans that cover certain current and former key employees. At December 31, 2001 and 2000, the funded balances of such plans totaled approximately $4 million and $5 million, respectively, none of which consisted of Alliant Energy common stock. Alliant Energy's pension benefit obligation under these plans was $34.4 million and $26.2 million at December 31, 2001 and 2000, respectively. Alliant Energy's pension expense under these plans was $3.4 million, $3.6 million, and $2.5 million in 2001, 2000 and 1999, respectively.

Alliant Energy has various life insurance policies that cover certain key employees and directors. At December 31, 2001 and 2000, the cash surrender value of these investments was $30 million and $27 million, respectively.

Under Alliant Energy's deferred compensation plans, certain key employees and directors can defer part or all of their current compensation in company stock or interest accounts, which are held in grantor trusts. At December 31, 2001 and 2000, the value of the trusts totaled approximately $2.2 million and $1.0 million, respectively, the majority of which consisted of Alliant Energy common stock.

A significant number of Alliant Energy employees also participate in defined contribution pension plans (401(k) and Employee Stock Ownership plans). Alliant Energy's contributions to the plans, which are based on the participants' level of contribution, were $8.2 million, $8.1 million, and $7.4 million in 2001, 2000 and 1999, respectively.

(b) Long-Term Equity Incentive Plan - Alliant Energy has a long-term equity incentive plan that permits the grant of non qualified stock options, incentive stock options, restricted stock, performance shares and performance units to key employees. At December 31, 2001, non-qualified stock options, restricted stock and performance shares were outstanding. The maximum number of shares of Alliant Energy common stock that may be issued under the plan is 3.8 million.

Options granted to date under the plan were granted at the fair market value of the shares on the date of grant, vest over three years and expire no later than 10 years after the grant date. Options become fully vested upon retirement and remain exercisable at any time prior to their expiration date, or for three years after the effective date of the retirement, whichever period is shorter. Participants' options that are not vested become forfeited when participants leave Alliant Energy and their vested options expire after three months.

A summary of the stock option activity was as follows:

Outstanding at beginning of year Options granted Options exercised Options forfeited Outstanding at end of year Exercisable at end of year 2001 Weighted Average Exercise Shares Price 2,265,862

$29.67 721,072 31.14 (42,432) 29.87 (27,273) 30.07 2,917,229

$30.03 1,593,047

$29.94 2000 Weighted Average Exercise Shares Price 1,543,028

$30.32 899,094 28.59 (15,486) 30.03 (160,774) 29.90 2,265,862

$29.67 962,073

$30.12 1999 Weighted Average Exercise Shares Price 751,084

$30.83 824,564 29.88 (32,620) 30.55 1,543,028

$30.32 333,782

$30.80 60 ALLIANT ENERGY 2001 ANNUAL REPORT

The range of exercise prices for the options outstanding at December 31, 2001 was $27.50 to $31.56. The value of the options granted during the year using the Black-Scholes pricing method was as follows:

2001 2000 1999 Value of options based on Black-Scholes model Volatility Risk free interest rate Expected life Expected dividend yield

$4.30 18.90/%

5.0%

10 years 6.6%

$7.71 32.7%

5.7%

10 years 6.3%

$4.71 20.2%

5.8%

10 years 6.7%

Alliant Energy follows Accounting Principles Board Opinion (APB) 25, "Accounting for Stock Issued to Employees," to account for stock options. No compensation cost is recognized because the option exercise price is equal to the market price of the underlying stock on the date of grant. Had compensation cost for the plan been determined based on the Black-Scholes value at the grant dates for awards as prescribed by SEAS 123, "Accounting for Stock-Based Compensation," pro forma net income and earnings per share would have been:

Pro forma net income (in millions)

Pro forma earnings per share (basic)

Pro forma earnings per share (diluted) 2001 2000 1999

$169.3

$391.7

$192.7 2.10 2.10 4.96 2.46 4.95 2.46 In 2001 and 1999, 1,745 and 65,752 shares, respectively, of restricted stock with three-year restriction periods were awarded. At December 31, 2001 and 2000, there were 61,137 and 62,490 shares outstanding, respectively. Any unvested shares of restricted stock become fully vested upon retirement.

Participants' unvested restricted stock is forfeited when the participant leaves Alliant Energy. Compensation cost, which is recognized over the three-year restriction period, was $0.6 million, $0.6 million and $0.4 million in 2001, 2000 and 1999, respectively.

The payout to key employees of Corporate Services for performance shares is contingent upon achievement over a three-year period of specified earnings per share growth and total return to shareowners of Alliant Energy compared with an investor-owned utility peer group. The payout to key employees of Resources is contingent upon achievement over a three-year period of specified Resources earnings per share growth. Performance shares are paid out in shares of Alliant Energy's common stock or a combination of cash and stock and are modified by a performance multiplier, which ranges from 0 to 2, based on the performance criteria. Performance shares have an intrinsic value equal to the market price of a share on the date of grant. Pursuant to APB 25, Alliant Energy accrues the plan expense over the three-year period the services are performed and recognized $2.4 million, $0.4 million and $1.6 million of expense in 2001, 2000 and 1999, respectively.

(7) COMMON AND PREFERRED STOCK (a) Common Stock - During 2001, 2000 and 1999, Alliant Energy issued 897,220 shares, 26,100 shares and 1,353,971 shares, respectively, of common stock under its various stock plans. In addition, in November 2001, Alliant Energy completed a public offering of 9.775 million shares of its common stock at a price per share to the public of $28.00. The net proceeds of approximately $263 million were used to repay short-term debt. From January 2000 to June 2001, Alliant Energy satisfied its requirements under the Shareowner Direct Plan (dividend reinvestment and stock purchase plan) by acquiring Alliant Energy common stock on the open market, rather than through original issue. At December 31, 2001 and 2000, Alliant Energy had a total of 2.6 million and 5.0 million shares, respectively, available for issuance in the aggregate, pursuant to its Shareowner Direct Plan, Long-Term Equity Incentive Plan and 401(k) Savings Plan.

Alliant Energy has a Shareowner Rights Plan whereby rights will be exercisable only if a person or group acquires, or announces a tender offer to acquire, 15 percent or more of Alliant Energy's common stock. Each right will initially entitle shareowners to buy one-half of one share of Alliant Energy's common stock. The rights will only be exercisable in multiples of two at an initial price of $95.00 per full share, subject to adjustment. If any shareowner acquires 15 percent or more of the outstanding common stock of Alliant Energy, each right (subject to limitations) will entitle its holder to purchase, at the right's then current exercise price, a number of common shares of Alliant Energy or of the acquirer having a market value at the time of twice the right's per full share exercise price. The Board of Directors is also authorized to reduce the 15 percent ownership threshold to not less than 10 percent.

Alliant Energy's utility subsidiaries each have common stock dividend restrictions based on their respective bond indentures and articles of incorporation, and restrictions on the payment of common stock dividends commonly found with preferred stock. In addition, IP&L's ability to pay common stock dividends is restricted based on requirements associated with sinking funds. WP&L's common stock dividends are restricted to the extent that such dividend would reduce the common stock equity ratio to less than 25 percent. Also the PSCW ordered that it must approve the payment of dividends by ALLIANT ENERGY 2001 ANNUAL REPORT 6]

Notes to Consolidated Financial Statements (continued)

WP&L to Alliant Energy that are in excess of the level forecasted in the rate order ($58.3 million), if such dividends would reduce WP&LUs average common equity ratio below 52 percent of total capitalization. The dividends paid by WP&L to Alliant Energy since the rate order was issued have not exceeded such level.

In 2001. 14 non-employee directors received up to 1,000 shares each of Alliant Energy common stock through the Shareowner Direct Plan as part of the directors' compensation program, for a total of approximately $338,000. In 2000, 12 non-employee directors received up to $20,000 each in Alliant Energy common stock, for a total of approximately $222,000. In 1999, matching contributions of $2,500 each were made to nine non-employee directors.

(b) Preferred Stock - IP&L has outstanding 545,000 shares of 6.400/0, $50 par value preferred stock with a final redemption date of May 1, 2022. Under the provisions of the mandatory sinking fund, beginning in 2003, IP&L is required to redeem annually $1.4 million, or 27,250 shares of the preferred stock.

The carrying value of Alliant Energy's cumulative preferred stock of subsidiaries at December 31, 2001 and 2000 was $114 million. The fair market value, based upon the market yield of similar securities and quoted market prices, at December 31, 2001 and 2000 was $99 million and $90 million, respectively. Information related to Alliant Energy's cumulative preferred stock of subsidiaries, net at December 31 was as follows:

2001 2000 (in millions)

Par/Stated Authorized Shares Mandatory Value Shares Outstandinq Series Redemption

$100 449,765 4.40% - 6.20%

No

$45.0

$45.0

$25 599,460 6.50%

No 15.0 15.0

$50 466,406 366,406 4.30% - 6.10%

No 18.3 18.3

$50 216,381 4.36% - 7.76%

No 10.8 10.8

$50 545,000 6.40%

$50 / share 27.3 27.3 116.4 116.4 Less: unamortized expenses (2.4)

(2.6)

$114.0

$113.8 3,750,000 authorized shares in total. ** 2,000,000 authorized shares in total.

(8) DEBT (a) Short-Term Debt - To provide short-term borrowing flexibility and security for commercial paper outstanding, Alliant Energy and its subsidiaries maintain bank lines of credit, of which most require a fee. The utility subsidiaries participate in a utility money pool, which is funded, as needed, through the issuance of commercial paper by Alliant Energy. Interest expense and other fees are allocated based on borrowed amounts. The PSCW has restricted WP&L from lending money to non-utility affiliates and non Wisconsin utilities. As a result, WP&L can only borrow money from the utility money pool. At December 31, 2001, WP&L and IPC had money pool borrowings of $90.8 million and $40.0 million, respectively, and IESU had investments in the money pool of $1.9 million. At December 31, 2000, IESU, WP&L and IPC had money pool borrowings of $101.1 million, $29.2 million and $68.2 million, respectively. Information regarding short-term debt and lines of credit was as follows (dollars in millions):

62 ALLANT E-V ýGl 2001 ANNLAL REPORT

At year end:

Commercial paper outstanding Discount rates on commercial paper Notes payable outstanding Interest rates on notes payable For the year ended:

Average amount of short-term debt (based on daily outstanding balances)

Average interest rates on short-term debt (b) Long-Term Debt - IESU's indentures securing its First Mortgage Bonds and its Collateral Trust Bonds constitute direct first mortgage liens and a second lien while First Mortgage Bonds remain outstanding, respectively, upon substantially all tangible public utility property. WP&L's and IPC's First Mortgage Bonds are secured by substantially all of their utility plant. IESU and WP&L also maintain unsecured indentures relating to the issuance of debt securities.

Resources is party to a three-year credit agreement with various banking institutions that extends through October 2003, with one-year extensions available upon agreement by the parties. Unused borrowing availability under this agreement is also used to support Resources' commercial paper program. A combined maximum of $450 million of borrowings under this agreement and the commercial paper program may be outstanding at any one time. Interest rates are based on quoted market prices and maturities are set at the time of borrowing and are less than one year. At December 31, 2001 and 2000, Resources had $384 million and $321 million, respectively, of commercial paper outstanding backed by this facility with interest rates ranging from 3.00% to 3.450/0 and 6.37%Io to 6.65/, respectively. Resources intends to continue issuing commercial paper backed by this facility and no conditions existed at December 31, 2001 that would have prevented the issuance of commercial paper or direct borrowings under the three-year credit agreement.

In November 2001, Resources issued $300 million of senior notes at a fixed interest rate of 7%, due 2011. The notes are fully and unconditionally guaranteed by Alliant Energy.

Resources used the proceeds to repay other Resources' debt. In March 2001, IESU issued $200 million of senior unsecured debentures at a fixed interest rate of 6-3/4%/o, due 2011. IESU used the proceeds to repay short-and long-term debt.

In February 2000, Resources issued $402.5 million of exchangeable senior notes due 2030, with a stated interest rate of 7.250/% through February 2003 and 2.5% thereafter. The notes are exchangeable for cash based upon a percentage of the value of McLeod Class A Common Stock. Alliant Energy has agreed to fully and unconditionally guarantee the payment of principal and interest on the exchangeable senior notes.

Debt maturities for 2002 to 2006 are $10.5 million, $392.9 million, $91.0 million, $97.1 million and $93.8 million, respectively. Depending upon market conditions, it is currently anticipated that a majority of the maturing debt will be refinanced with the issuance of long-term securities.

The carrying value of Alliant Energy's long-term debt (including current maturities and variable rate demand bonds) at December 31, 2001 and 2000 was $2.5 billion and $2.1 billion, respectively. The fair market value, based upon the market yield of similar securities and quoted market prices, at December 31, 2001 and 2000 was $2.6 billion and $2.4 billion, respectively.

(9) INVESTMENTS AND ESTIMATED FAIR VALUE OF FINANCIAL INSTRUMENTS The carrying amount of Alliant Energy's current assets and current liabilities approximates fair value because of the short maturity of such financial instruments. Since the utility subsidiaries are subject to regulation, any gains or losses related to the difference between the carrying amount and the fair value of their financial instruments may not be realized by Alliant Energy's shareowners. Information relating to various investments held by Alliant Energy that are marked-to-market as a result of SFAS 115 were as follows (in millions):

ALLIANT ENERGY 2001 ANNUAL REPORT 63 2001

$68.4 2.4-3.2%

N/A

$221.6 4.5%

2000

$283.9 6.4-6.7%

$50.1 6.5%

$236.4 6.5%

1999

$374.7 5.6-6.5%

$50.0 6.3%

$185.9 5.4%

Notes to Consolidated Financial Statements (continued)

December 31, 2001 December 31, 2000 Unrealized Carrying/

Gains/

Carrying/

Unrealized Fair (Losses),

Fair Gains, Net Value Net of Tax Value of Tax Available-for-sale securities:

Nuclear decommissioning trust funds:

Debt securities

$191

$3

$180

$3 Equity securities 142 42 128 50 Total 333 45 308 53 Investment in McLeod 15 (9) 570 317 Various other investments 24 1

52 19 Trading securities:

Investment in McLeod 6

(a) 221 (a)

(a) Adjustments to the trading securities are reflected in earnings in the "Miscellaneous, net" line in the Consolidated Statements of Income.

Nuclear Decommissioning Trust Funds - At December 31, 2001, $114 million, $37 million and $40 million of the debt securities mature in 2002-2010, 2011-2020 and 2021-2049, respectively. The fair value of the nuclear decommissioning trust funds was as reported by the trustee, adjusted for the tax effect of unrealized gains and losses. Net unrealized holding gains were recorded as part of accumulated provision for depreciation. The funds realized gainsl(losses) from the sales of securities of $2.0 million, $5.0 million and ($7.9) million in 2001, 2000 and 1999, respectively (cost of the investments based on specific identification was $169.8 million, $213.4 million and $120.1 million, respectively, and proceeds from the sales were $171.8 million, $218.4 million and $112.2 million, respectively).

Investment in McLeod - At December 31, 2001 and 2000, Alliant Energy beneficially owned 56.1 million shares of common stock in McLeod, a telecommunications company. Alliant Energy had 40.5 million shares classified as available-for-sale and 15.6 million shares as trading and the cost basis of the investment was $30.5 million. Pursuant to the provisions of SFAS 115, the carrying value of Alliant Energy's investment in McLeod is adjusted to the estimated fair value each quarter based on the closing price at the end of the quarter.

Adjustments to the available-for-sale securities do not impact earnings as the unrealized gains or losses, net of taxes, are recorded directly to the common equity section of the Consolidated Balance Sheets as a component of "Accumulated other comprehensive income (loss)." In addition, any such gains or losses are reflected in current earnings only at the time they are realized through a sale or if a decline in the stock price below Alliant Energy's cost basis is determined to be "other-than-temporary." Adjustments to the trading securities are reflected in earnings in the "Miscellaneous, net" line in the Consolidated Statements of Income. Alliant Energy realized pre-tax gains from the sales of McLeod available-for-sale securities of $23.8 million and $40.3 million in 2000 and 1999, respectively (cost of the investments based on the first-in-first-out method were $0.2 million and $0.6 million, respectively, and proceeds from the sales were $24.0 million and $40.9 million, respectively). Alliant Energy's ability to sell the McLeod stock was subject to various restrictions under an agreement with McLeod that expired December 31, 2001.

Investments in Foreign Entities - The geographic concentration of Alliant Energy's foreign investments at December 31 was as follows (in millions):

Brazil New Zealand/Australia China Mexico Other Total 2001 Unconsolidated

$378

$124

$30

$41

$573 Consolidated 146 146 Total

$378

$124

$176

$41

$719 2000 Unconsolidated

$319

$140

$30

$18

$1

$508 Consolidated 50 50 Total

$319

$140

$80

$18

$1

$558 64 ALLIANT ENERGY 2001 ANNUAL REPORT

Brazil - Resources holds interests in five Brazilian electric utilities (Companhia Forca e Luz Cataguazes - Leopoldina, S.A.

(Cataguazes), Companhia Energetica da Borborema S.A.,

Companhia de Electricidade de Nova Friburgo S.A., Empresa Energetica de Sergipe S.A. and Sociedade Anonima de Eletrificacao da Paraiba) through several direct investments accounted for under the equity method of accounting. At December 31, 2001 and 2000, Resources' investments included a 49.9O/% direct ownership interest in GIPAR, S.A., an electric utility holding company; a 39.4O/% direct ownership interest in Cataguazes, an electric utility; and a 45.6O/o direct ownership interest in Energisa, S.A., an energy development company. At December 31, 2001, Resources' investments also included a 49.9% direct ownership interest in Pbpart - SE 1 Ltda., an electric utility holding company, and a 49.7% direct ownership interest in Usina Termeletrica de Juiz de Fora S.A., a thermal power plant project. At December 31, 2001, the total investment balance exceeded Resources' share of the underlying net equity of the applicable investees by approximately $38 million which has been assigned to the assets and liabilities of the investees and is being amortized over their remaining estimated lives.

New Zealand/Australia - Resources' investments included a non-controlling 69.5%/ ownership interest in Southern Hydro, a hydroelectric generating company in Australia; a 20.4%/o ownership interest in TrustPower Ltd., a New Zealand utility company; and a 9.3% ownership interest in Infratil Limited, a New Zealand utility holding company. Southern Hydro and TrustPower Ltd. are accounted for under the equity method and Infratil Limited is accounted for under the cost method. At December 31, 2001, the investment balance exceeded Resources' share of the underlying net equity of the above investees accounted for under the equity method by approximately $21 million; $14 million has been assigned to the assets and liabilities of Southern Hydro and is amortized over their estimated lives; and $7 million of goodwill at TrustPower Ltd. which was being amortized over 20 years prior to the adoption of SFAS 142,"Goodwill and Other Intangible Assets," on January 1, 2002.

China - Resources' consolidated investments included a 93.5%

ownership interest in Peak Pacific Investment Company, Ltd.

(Peak), a company that develops combined heat and power generating facilities for large industrial customers. At December 31, 2001, Peak's portfolio included five combined heat and power facilities. At December 31, 2001, Resources' consolidated investments also included a 64.0% ownership interest in Anhui New Energy Heat & Power Co., Ltd., a combined heat and power facility. Resources' unconsolidated investments included a 50.0%/o ownership interest in Jiaxing JIES Power & Heat Co., Ltd.

and a 30.00%o ownership interest in Tongxiang TIES Power &

Heat Co., Ltd. Both of these combined heat and power facilities are accounted for under the equity method.

Mexico - Resources' investment in Mexico consisted of a loan receivable (including accrued interest income) from a Mexican development company. Under provisions of the loan, Resources has agreed to lend up to $65 million to support the development of a resort community near the Baja peninsula. The loan accrues interest at 8.75% and is secured by the undeveloped land of the resort community. Repayment of the loan principal and interest will be based on a portion of the proceeds from the sales of real estate in the resort community and therefore is dependent on the successful development of the project and the ability to sell real estate. Alliant Energy may also realize royalty income on the real estate sales once the loan is repaid.

Investment in ATC - WP&L, including South Beloit, transferred its transmission assets with no gain or loss (approximate net book value of $186 million) to ATC on January 1, 2001. WP&L received a tax-free cash distribution of $75 million from ATC and had a $110 million equity investment in ATC, with an ownership percentage of approximately 26.5 percent at December 31, 2001. WP&L accounts for its investment in ATC under the equity method.

Investment in Cargill-Alliant - Alliant Energy has a 50.0 percent ownership interest in Cargill-Alliant, an electricity trading business that is accounted for under the equity method with investment balances of approximately $22 million and $21 million at December 31, 2001 and 2000, respectively.

Unconsolidated Equity Investments - Summary financial information from Alliant Energy's unconsolidated equity investments' financial statements is as follows (in millions):

Income statement data (for the year ended):

Operating revenues Operating income Income floss) from continuing operations Net income (loss)

Alliant Energy Ownership Less Than or Equal to 50%

2001 2000 1999

$2,248.0

$1,196.4

$297.2 141.4 43.1 11.5 52.2 67.6 5.9 52.2 67.6 5.9 200

$465 86 (5

(5 Alliant Energy Ownership Greater Than 50%

)1 2000

.4

$155.5

.7 20.6 i.5) 6.5

.5) 6.5 ALLIANT ENERGY 2001 ANNUAL REPORT 65 999

$0.5 0.1 (0.1)

(0.1)

Notes to Consolidated Financial Statements (continued)

Balance sheet data (at December 31):

Current assets Non-current assets Current liabilities Non-current liabilities (excluding minority interest)

Minority interest Alliant Energy Ownership Less Than or Equal to 50%

2001 2000

$460.0

$519.2 2,195.6 1,562.8 528.0 613.6 574.6 534.7 213.5 212.9 Alliant Energy Ownership Greater Than 50%

2001 2000

$234.6

$140.9 1,322.2 1,073.8 329.3 241.0 707.4 486.9 58.0 16.7 (10) DERIVATIVE FINANCIAL INSTRUMENTS (a) Accounting for Derivative Instruments and Hedging Activities - Alliant Energy records derivative instruments at fair value on the balance sheet as assets or liabilities and changes in the derivatives' fair values in earnings unless specific hedge accounting criteria are met.

In the first quarter of 2001, Alliant Energy recorded a net loss of $12.9 million for a cumulative effect of a change in accounting principle representing the impact of adopting SFAS 133 as of January 1, 2001 at Alliant Energy's equity method investees. This transition adjustment represents Alliant Energy's share of the difference between the carrying amount of Southern Hydro's electricity derivative contracts under the applicable accounting principles in effect at December 31, 2000, and the carrying values of these electricity derivative contracts as determined in accordance with SFAS 133 as of January 1, 2001.

In the third quarter of 2000, Alliant Energy recorded net income of $16.7 million for a cumulative effect of a change in accounting principle representing the impact of adopting SFAS 133 as of July 1, 2000 at Alliant Energy's consolidated subsidiaries. This transition adjustment was primarily the result of the difference between the carrying amount of Resources' exchangeable senior notes issued in February 2000 under the applicable accounting principles in effect at June 30, 2000, and the carrying values of the debt and derivative components of the notes as determined in accordance with SFAS 133 as of July 1, 2000. Transition adjustments relating to Alliant Energy's other derivative instruments had no material impact on net income.

The consolidated financial statement impact of adopting SFAS 133 was as follows (in millions):

Financial Statement Account Investments in unconsolidated foreign entities Other assets Other liabilities (a)

Cumulative effect of a change in accounting principle (other comprehensive income)

Other comprehensive income (b)

Long-term debt (c)

Cumulative effect of a change in accounting principle, net of tax Pre-tax gain on transfer to trading account (d)

Deferred tax expense (d)

Financial Statement Balance sheet Balance sheet Balance sheet Balance sheet Balance sheet Balance sheet Income statement Income statement Income statement Increase (Decrease)

July 1, 2000 January 1, 2001

($18.4) 2.0 302.2 (6.6)

(187.3)

(310.3) 16.7 321.4 134.1 (5.5)

(12.9)

(a)

Includes the embedded derivative component of Resources" exchangeable senior notes of $283.7 million on July 1, 2000 and deferred income taxes related to Southern Hydro's electricity contracts on January 1, 2001 (b)

Represents net of tax reduction to other comprehensive income resulting from classification of approximately 15.6 million shares of McLeod as trading securities (equal to net amount of two line items in (d))

(c)

Adjustment to the debt component of Resources' exchangeable senior notes (d)

Gain and tax expenses associated with the transfer of approximately 15.6 million shares of McLeod from available-for-sale securities to trading securities 66 ALLiANT ENERGY 2001 ANNUAL REPORT

During 2001 and 2000, $0.1 million of net gains and $6.7 million of net losses, respectively, included in the cumulative effect of a change in accounting principle component of accumulated other comprehensive income (loss) were reclassified into earnings, resulting in remaining balances of $0 and $0.1 million at December 31, 2001 and 2000, respectively.

Cash Flow Hedging Instruments - During 2001 and 2000, Alliant Energy held various derivative instruments designated as cash flow hedging instruments. WP&L utilized gas commodity financial swap arrangements to reduce the impact of price fluctuations on gas purchased and injected into storage during the summer months and withdrawn and sold at current market prices during the winter months pursuant to the natural gas cost incentive sharing mechanism with customers in Wisconsin. Alliant Energy's utility subsidiaries utilized physical coal purchase contracts, which did not qualify for the normal purchase and sale exception, to manage the price of anticipated coal purchases and sales. For WP&L, these contracts are used to manage costs within the forecasts used to set its electric rates. For IP&L, these contracts are used to minimize customer rates in its dollar-for-dollar recovery mechanism in Iowa. Treasury rate locks were used to mitigate risk associated with movements in the ten-year treasury yield used to price $300 million of Resources' senior notes issued in November 2001. Interest rate swaps were used by Southern Hydro to manage the future interest payments of its variable rate debt. SmartEnergy, Inc., an energy services company operating in deregulated markets, utilized electricity swaps to reduce the impact of price fluctuations on electricity purchased to meet the requirements of its customers.

In 2001 and 2000, net gains of $2.0 million and $0.4 million, respectively, were recognized relating to the amount of hedge ineffectiveness in accordance with SFAS 133. Alliant Energy did not exclude any components of the derivative instruments' gain or loss from the assessment of hedge effectiveness and in 2001 reclassified a loss of $0.9 million into earnings as a result of the discontinuance of hedges. At December 31, 2001, the maximum length of time over which Alliant Energy hedged its exposure to the variability in future cash flows for forecasted transactions was 10 months and Alliant Energy estimated that gains of $2.9 million will be reclassified from accumulated other comprehensive income (loss) into earnings in 2002 as the hedged transactions affect earnings. At December 31, 2000, the maximum length of time over which Alliant Energy hedged its exposure to the variability in future cash flows for forecasted transactions was 18 months and Alliant Energy estimated that losses of $3.7 million would be reclassified from accumulated other comprehensive income (loss) into earnings in 2001 as the hedged transactions affected earnings.

Other Derivatives Not Designated in Hedge Relationships Alliant Energy's derivatives that were not designated in hedge relationships during 2001 and/or 2000 included the embedded derivative component of Resources' exchangeable senior notes, oil and gas swaps and collars, electricity price collars, physical coal contracts not designated in hedge relationships and electricity derivative contracts at Southern Hydro.

At maturity, the holders of Resources' exchangeable senior notes are paid the higher of the principal amount of the notes or an amount based on the value of McLeod common stock. SFAS 133 requires that Alliant Energy split the value of the notes into a debt component and a derivative component. The payment feature tied to McLeod stock is considered an embedded derivative under SFAS 133 that must be accounted for as a separate derivative instrument. This component is classified as a "Derivative liability" on the Consolidated Balance Sheets.

Subsequent changes in the fair value of the option are reflected as increases or decreases in Alliant Energy's reported net income.

The carrying amount of the host debt security, classified as long term debt, is adjusted for amortization of the debt discount in accordance with the interest method as prescribed by APB 21, "Interest on Receivables and Payables."

Changes in the fair value of the McLeod shares designated as trading are reflected as increases or decreases in Alliant Energy's net income. These trading gains or losses are expected to correspond with and partially offset changes in the intrinsic value of the derivative component of Resources' exchangeable senior notes. Changes in the time value portion of the derivative component will result in non-cash increases or decreases to Alliant Energy's net income. Included in "Miscellaneous, net" in Alliant Energy's Consolidated Statements of Income for 2001 and 2000, was expense of $215.1 million and $102.5 million, respectively, related to the change in value of the McLeod trading securities, partially offset by income of $181.6 million and $101.8 million, respectively, related to the change in value of the derivative component of the exchangeable senior notes.

Whiting is exposed to commodity price risk in the pricing of its oil and gas production. Alliant Energy has previously utilized oil and gas swaps and collars to mitigate the impact of oil and gas price fluctuations. At December 31, 2001, Whiting did not have any swaps or collars outstanding.

Electricity price collars were used to manage utility energy costs during supply/demand imbalances. Physical coal contracts that do not qualify for the normal purchase and sale exception were used to manage the price of anticipated coal purchases and sales.

For WP&L, these contracts are used to manage costs within the forecasts used to set its electric rates. Due to the dollar-for dollar fuel recovery mechanism in Iowa, changes in the fair value of these instruments are recorded in regulatory assets/liabilities at IP&L.

Southern Hydro, a foreign affiliate of Alliant Energy accounted for under the equity method of accounting, enters into electricity derivative contracts which have not been designated in hedge relationships to manage the electricity commodity price risk associated with anticipated sales into the spot market. At December 31, 2001, these instruments were recorded at their fair value as a component of "Investments in unconsolidated foreign entities" on the Consolidated Balance Sheets and changes in fair value were recorded as a component of "Equity income from unconsolidated investments" in the Consolidated Statements of Income.

ALLIANT ENERGY 2001 ANNUAL REPORT 67

Notes to Consolidated Financial Statements (continued)

(b) Weather Derivatives - Alliant Energy uses weather derivatives to reduce the impact of weather volatility on its natural gas sales volumes. In 2001 and 2000, Alliant Energy entered into non-exchange traded options based on heating degree days in which Alliant Energy receives payment from the counterparty if actual heating degree days are less than the strike price in the contract.

Alliant Energy paid premiums to enter into these contracts, which are amortized to expense over the contract period. Alliant Energy has used the intrinsic value method to account for these weather derivatives.

(c) Nuclear Decommissioning Trust Fund Investments - Historically, WP&L has entered into combinations of options to mitigate the effect of significant market fluctuations on its common stock investments in its nuclear decommissioning trust funds. The derivative transactions are designed to protect the portfolio's value while allowing the funds to earn a total return modestly in excess of long-term expectations over the hedge period. Fair value changes of these instruments do not impact net income as they are recorded as equally offsetting changes in the investment in nuclear decommissioning trust funds and accumulated depreciation.

(d) Energy-trading Contracts - Resources is the majority owner of a natural gas marketing operation, NG Energy Trading, LLC (NG). NG enters into financial and physical contracts for the sale, purchase, storage, transportation and loan of natural gas. NG accounts for all its positions, including gas in storage, at estimated fair value, with changes in fair value reported in earnings.

(11) COMMITMENTS AND CONTINGENCIES (a) Construction and Acquisition Program - Alliant Energy currently anticipates 2002 construction and acquisition expenditures will be approximately $800 million, consisting of $400 million for its utility operations, $170 million for oil and gas investments, $100 million for non-regulated generation investments, $55 million for energy-related international investments and $75 million for other business development initiatives at Resources. During 2003-2006, Alliant Energy currently anticipates construction and acquisition expenditures of approximately $1.9 billion for its utility operations, $960 million for non-regulated generation investments, $260 million for oil and gas investments, $200 million for energy-related international investments and $310 million for other business development initiatives at Resources. These amounts do not include any potential capital expenditures Alliant Energy may make for its Power Iowa domestic generation program given the uncertainty of such investments, including if Alliant Energy would own the generating plants or purchase the power from plants that were owned by an independent entity.

(b) Purchased-Power, Coal and Natural Gas Contracts - Alliant Energy, through its subsidiaries (Corporate Services, IESU, WP&L and IPC), has entered into purchased-power, coal and natural gas supply, transportation and storage contracts. Certain purchased-power commitments are considered operating leases and are therefore not included here, but are included in Note 3. The natural gas supply commitments are all index-based. Alliant Energy expects to supplement its coal and natural gas supplies with spot market purchases as needed. The table includes commitments for "take-or-pay" contracts which result in dollar commitments with no associated MWhs, tons or Dths. Alliant Energy's minimum commitments are as follows (dollars and Dths in millions; MWhs and tons in thousands):

Purchased-power Coal Natural gas Dollars MWhs Dollars Tons Dollars Dths 2002

$74.9 1,015

$76.9 9,206

$76.2 9

2003 53.4 1,156 72.9 8,729 44.5 1

2004 11.8 361 46.9 4,282 15.3 2005 0.1 32.7 3,100 12.9 2006 0.1 11.6 898 12.4 (c) Legal Proceedings - Alliant Energy is involved in legal and administrative proceedings before various courts and agencies with respect to matters arising in the ordinary course of business. Although unable to predict the outcome of these matters, Alliant Energy believes that appropriate reserves have been established and final disposition of these actions will not have a material adverse effect on its financial condition or results of operations.

68 AILIANT ENERGY 2001 ANNUAL REPORT

(d) Financial Guarantees and Commitments - As part of Alliant Energy's electricity tr~ling joint venture with Cargill, both Alliant Energy and Cargill have made guarantees to certain counterparties regarding the performance of contracts entered into by the joint venture. Revocable guarantees of approximately $186 million and $160 million have been issued, of which approximately $26 million and $42 million were outstanding at December 31, 2001 and 2000, respectively. Under the terms of the joint venture agreement, any payments required under the guarantees would be shared by Alliant Energy and Cargill on a 50/50 basis to the extent the joint venture is not able to reimburse the guarantor for payments made under the guarantee.

At December 31, 2001 and 2000, Alliant Energy had issued guarantees to support unconsolidated affiliate and third-party financing arrangements of approximately $14 million and $21 million, respectively. Such guarantees are not reflected in the consolidated financial statements. Management believes the likelihood of Alliant Energy having to make any material cash payments under these guarantees is remote.

(e) Environmental Liabilities - Alliant Energy had recorded the following environmental liabilities, and regulatory assets associated with certain of these liabilities, at December 31 (in millions):

Environmental liabilities 2001 2000 Regulatory assets 2001 2000 MGP sites

$43.9

$48.0 MGP sites

$50.2

$54.3 NEPA 8.2 10.4 NEPA 9.7 11.9 Oil and gas properties 4.0 13.0 Other 3.2 0.6 Other 0.4 0.5

$63.1

$66.8

$56.5

$71.9 MGP Sites - IESU, WP&L and IPC have current or previous ownership interests in 34, 14 and 9 sites, respectively, previously associated with the production of gas for which they may be liable for investigation, remediation and monitoring costs relating to the sites. IESU, WP&L and IPC have received letters from state environmental agencies requiring no further action at four, five and one site(s), respectively. The companies are working pursuant to the requirements of various federal and state agencies to investigate, mitigate, prevent and remediate, where necessary, the environmental impacts to property, including natural resources, at and around the sites in order to protect public health and the environment.

The utility subsidiaries record environmental liabilities based upon periodic studies, most recently updated in the third quarter of 2001, related to the MGP sites. Such amounts are based on the best current estimate of the remaining amount to be incurred for investigation, remediation and monitoring costs for those sites where the investigation process has been or is substantially completed, and the minimum of the estimated cost range for those sites where the investigation is in its earlier stages. It is possible that future cost estimates will be greater than current estimates as the investigation process proceeds and as additional facts become known. The amounts recognized as liabilities are reduced for expenditures made and are adjusted as further information develops or circumstances change. Costs of future expenditures for environmental remediation obligations are not discounted to their fair value. Management currently estimates the range of remaining costs to be incurred for the investigation, remediation and monitoring of all utility subsidiary sites to be approximately $33 million to $58 million.

Under the current rate making treatment approved by the PSCW, the MGP expenditures of WP&L, net of any insurance proceeds, are deferred and collected from gas customers over a five-year period after new rates are implemented. The MPUC also allows the deferral of MGP-related costs applicable to the Minnesota sites and IPC has been successful in obtaining approval to recover such costs in rates in Minnesota. The IUB has permitted utilities to recover prudently incurred costs. Regulatory assets have been recorded by each of the utility subsidiaries, which reflect the probable future rate recovery, where applicable. Considering the current rate treatment, and assuming no material change therein, the utility subsidiaries believe that the clean-up costs incurred for these MGP sites will not have a material adverse effect on their respective financial conditions or results of operations.

Settlement has been reached with all the utility subsidiaries' insurance carriers regarding reimbursement for their MOP-related costs.

Insurance recoveries available at December 31, 2001 for IESU, WP&L and IPC were $0, $2.1 million and $4.7 million, respectively.

Pursuant to their applicable rate making treatment, IPC has recorded its recoveries in "Other long-term liabilities and deferred credits" and WP&L has recorded its recoveries as an offset against its regulatory assets. In February 2001, the IUB issued an order directing IESU to refund its insurance recoveries from MOP sites. Under the refund plan, IESU returned 90 percent of the recoveries to customers in 2001 and retained 10 percent.

ALLIANT ENERGY 2001 ANNUAL REPORT 69

Notes to Consolidated Financial Statements (continued)

National Energy Policy Act of 1992 - NEPA requires owners of nuclear power plants to pay a special assessment into a "Uranium Enrichment Decontamination and Decommissioning Fund." The assessment is based upon prior nuclear fuel purchases. IP&L and WP&L recover the costs associated with this assessment over the period the costs are assessed. Alliant Energy continues to pursue relief from this assessment through litigation.

Oil and Gas Properties Dismantlement and Abandonment Costs - Whiting is responsible for certain dismantlement and abandonment costs related to various off-shore oil and gas platforms (and related on-shore plants and equipment), the most significant of which is located off the coast of California.

In 2001, Whiting revised its estimate for the total costs for these properties from approximately $13 million to approximately $4 million, which it has accrued. Whiting reduced the estimated liability primarily due to the successful efforts to have the California facility designated as a permanent facility, therefore significantly reducing the amount of dismantlement required. The most significant expenditures are not expected to be incurred until 2008.

(f) Decommissioning of DAEC and Kewaunee Pursuant to the most recent electric rate case orders, the IUB and PSCW allow IP&L and WP&L to recover $6 million and

$16 million annually for their share of the cost to decommission DAEC and Kewaunee, respectively.

Decommissioning expense is included in "Depreciation and amortization" in the Consolidated Statements of Income and the cumulative amount is included in "Accumulated depreciation" on the Consolidated Balance Sheets to the extent recovered through rates.

Additional information relating to the decommissioning of DAEC and Kewaunee included in the most recent electric rate orders was as follows (dollars in millions):

Assumptions relating to current rate recovery amounts:

Alliant Energy's share of estimated decommissioning cost Year dollars in Method to develop estimate Annual inflation rate Decommissioning method Year decommissioning to commence After-tax return on external investments:

Qualified Non-qualified External trust fund balance at December 31, 2001 Internal reserve at December 31, 2001 After-tax earnings on external trust funds in 2001 DAEC

$252.8 1993 NRC minimum formula 4.91%

Prompt dismantling and removal 2014 7.34%

5.80%

$117.2

$21.7

$3.6 Kewaunee

$224.9 2001 Site-specific study 5.83%

Prompt dismantling and removal 2013 5.62%

6.97%

$215.8

$7.1 The rate recovery amounts for DAEC only include an inflation estimate through 1997. Both IP&L and WP&L are funding all rate recoveries for decommissioning into external trust funds and funding on a tax-qualified basis to the extent possible. All of the rate recovery assumptions and levels will be addressed in IP&L's and WP&L's 2002 rate cases. In accordance with their respective regulatory requirements, IP&L and WP&L record the earnings on the external trust funds as interest income with a corresponding entry to interest expense at IP&L and to depreciation expense at WP&L. The earnings accumulate in the external trust fund balances and in accumulated depreciation on utility plant.

70 ALLIANT ENERGY 2001 ANNUAL REPORT

IP&L's 70 percent share of the estimated cost to decommission DAEC based on the most recent site-specific study completed in 1998, and updated in 2001, is $395 million in 2002 dollars. This study includes the costs to terminate DAEC's NRC license, to return the site to a greenfield condition and for spent fuel storage. IP&L's 70 percent share of the estimated cost to decommission DAEC based on the most recent NRC minimum formula, using the direct disposal method, is $402.9 million in 2000 dollars. The NRC minimum formula is intended to apply only to the cost of terminating DAEC's NRC license. The additional decommissioning expense funding requirements which should result from these updated studies are not reflected in IP&L's rates.

(12) JOINTLY-OWNED ELECTRIC UTILITY PLANT Under joint ownership agreements with other Iowa and Wisconsin utilities, the utility subsidiaries have undivided ownership interests in jointly-owned electric generating stations. IP&L also has joint ownership agreements related to transmission facilities. Each of the respective owners is responsible for the financing of its portion of the construction costs. KWh generation and operating expenses are divided on the same basis as ownership with each owner reflecting its respective costs in its Consolidated Statements of Income.

Information relative to the utility subsidiaries' ownership interest in these facilities at December 31, 2001 was as follows (dollars in millions):

Fuel Type Ownership Interest %

Plant in STrvic Depnreciationn rnn Accumulated Provision for Construction Work-In PMrnnme Ottumwa Neal Unit 3 DAEC WP&L Columbia Energy Center Edgewater Unit 4 Edgewater Unit 5 Kewaunee PPC Neal Unit 4 Louisa Unit 1 Coal Coal Nuclear Coal Coal Coal Nuclear Coal Coal 48.0 28.0 70.0 46.2 68.2 75.0 41.0 21.5 4.0

$190.1 60.0 543.1

$793.2

$174.3

$105.3

$1.7 57.1 34.3 1.4 232.2 106.2 2.5 167.3 111.3 3.7

$630.9

$357.1

$9.3

$84.5

$56.8

$0.3 24.9 14.1

$109.4

$70.9

$0.3

$1,533.5

$875.5

$19.7

$113.7 35.3 298.5

$447.5

$2.2 0.3 7.6 Increases in utility plant in service balances for DAEC and Kewaunee during 2001 were largely due to projects for a power upgrade and the replacement of the steam generators, respectively. Both projects are expected to result in significant increases in generating capability compared to such capability prior to undertaking such projects.

ALLIANT ENERGY 2001 ANNUAL REPORT 71

Notes to Consolidated Financial Statements (continued)

(13) OIL AND GAS PRODUCING ACTIVITIES (a) Cost Information - Whiting's oil and gas activities are conducted entirely in the U.S. Costs incurred in oil and gas producing activities were as follows (in millions):

Proved property acquisition Development Exploration 2001

$66.0 32.1 0.8 Unproved property acquisition 0.1

$99.0 2000

$125.9 13.2 1999

$21.4 13.2 1.1 1.9 0.3

$140.5 Net capitalized costs related to Whiting's oil and gas producing activities at December 31 were as follows (in millions):

Proved oil and gas properties Unproved oil and gas properties Accumulated DD&A Oil and gas properties, net 2001

$391.4 0.7 (110.8)

$281.3 2000

$349.4 0.7 (123.9)

$226.2 0.3

$36.8 (b) Results of Operations - Whiting's results of operations for oil and gas producing activities (excluding corporate overhead and interest costs) were as follows (in millions):

Revenues Operating expenses:

DD&A Lease operating Production taxes Acquisition and exploration costs Impairment of proved oil and gas properties Results of operations for oil and gas producing activities before income taxes Income taxes Results of operations for oil and gas producing activities 2001

$134.6 26.9 31.5 6.5 0.8 2000

$94.1 21.5 25.0 5.4 1.1 53.0 41.1 10.6

$30.5 65.7 68.9 18.7

$50.2 1999

$62.6 19.8 21.3 3.0 1.9 3.3 49.3 13.3 2.0

$11.3 Whiting sold oil and gas properties in 2001, 2000 and 1999 for total proceeds of $19.6 million, $29.5 million and $13.0 million, respectively. In 2001, 2000 and 1999, Whiting had gains on sales of oil and gas properties of $11.7 million, $7.7 million and $10.2 million, respectively, which were recorded in "Miscellaneous, net" in Alliant Energy's Consolidated Statements of Income and were excluded in the results of operations data in the previous table.

(c) Reserve Quantity Information (Unaudited) - Whiting's estimates of proved reserves and related valuations were based primarily on reports of Ryder Scott Company, independent petroleum and geological engineers, in accordance with the provisions of SFAS 69, "Disclosures about Oil and Gas Producing Activities." The estimates of proved reserves are inherently imprecise and are continually subject to revision based on production history, results of additional exploration and development, price changes and other factors.

72 ALLIANT ENERGY 2001 ANNUAL REPORT

Whiting's oil and gas reserves are attributable solely to properties within the U.S. A summary of Whiting's changes in quantities of proved (developed and undeveloped) oil and gas reserves was as follows (in millions):

Whiting's proved developed oil and gas reserves at December 31 were as follows (in millions):

Balance, December 31, 1999 Purchases of minerals in place Extensions and discoveries Sales of minerals in place Production Revisions of previous estimates Balance, December 31, 2000 Purchases of minerals in place Extensions and discoveries Oil (barrels)

Gas (Dth) 11.9 122.6 11.9 45.8 0.5 4.7 (1.1)

(1.6)

(2.5) 19.1 1.0 1.1 Sales of minerals in place (0.7)

Production (2.1)

Revisions of previous estimates (3.6)

Balance, December 31, 2001 14.8 (8.8)

(16.9) 10.1 157.5 89.8 9.3 (6.0)

(19.8)

(3.3) 227.5 (d) Standardized Measure of Discounted Future Net Cash Flows (Unaudited) - Whiting's standardized measure of discounted future net cash flows relating to proved oil and gas reserves and the changes were prepared in accordance with the provisions of SFAS 69. Future cash inflows were computed by applying year-end prices to estimated future production. Future production and development costs are computed by estimating the expenditures to be incurred in producing and developing the proved oil and gas reserves at year-end, based on year-end costs and assuming continuation of existing economic conditions.

Future income tax expenses are calculated by applying appropriate year-end tax rates to future pre-tax net cash flows relating to proved oil and gas reserves, less the tax basis of properties involved. Future income tax expenses give effect to permanent differences, tax credits and loss carryforwards relating to the proved oil and gas reserves. Future net cash flows are discounted at a rate of 10 percent annually to derive the standardized measure of discounted future net cash flows. This calculation procedure does not necessarily result in an estimate of the fair market value or the present value of Whiting's oil and gas properties.

The standardized measure of discounted future net cash flows relating to Whiting's proved oil and gas reserves at December 31 was as follows (in millions):

Future cash inflows Future production costs Future development costs Future income tax expense Total future net cash flows 10 percent annual discount for estimated timing of cash flows Standardized measure of discounted future net cash flows 2001

$880.9 (379.7)

(75.6)

(62.0) 363.6 (151.9)

$211.7 2000

$1,912.5 (523.5)

(32.8)

(398.4) 957.8 (438.6)

$519.2 1999

$563.7 (204.7)

(27.2)

(72.7) 259.1 (108.2)

$150.9 ALLIANT ENERGY 2001 ANNUAL REPORT 73 Oil (barrels)

Gas (Dth) 2001 11.0 136.8 2000 14.9 134.4 1999 9.6 97.4

Notes to Consolidated Financial Statements (continued)

The changes in the standardized measure of discounted future net cash flows relating to Whiting's proved oil and gas reserves were as follows (in millions):

Beginning balance Net change in income taxes Purchases of minerals in place Accretion of discount Extensions, discoveries and improved recoveries Development costs, net Sales of minerals in place Revisions of previous quantity estimates Sale of oil and gas produced, net of production costs Net changes in prices and production costs Changes in production rates and other Ending balance 2001

$519.2 183.1 84.6 73.5 17.5 (3.3)

(11.2)

(16.2)

(87.3)

(528.1)

(20.1)

$211.7 2000

$150.9 (170.3) 241.1 19.0 33.9 4.4 (18.0)

(9.6)

(76.7) 359.4 (14.9)

$519.2 1999

$105.3 (25.3) 28.0 11.9 7.6 5.4 (11.8) 10.5 (36.6) 55.9

$150.9 Prices in effect at December 31 used in determining future net revenues related to the standardized measure calculations, excluding hedging activity, were as follows:

Oil (per barrel)

Gas (per Dth) 2001

$16.84

$2.76 2000

$24.04

$9.18 1999

$22.43

$2.40 (14) SEGMENTS OF BUSINESS Alliant Energy's principal business segments are:

0 Regulated domestic utilities - consists of IP&L and WP&L, serving customers in Iowa, Wisconsin, Minnesota and Illinois, and is broken down into three segments: a) electric operations; b) gas operations; and c) other, which includes the steam and water businesses and the unallocated portions of the utility business. Various line items in the following tables are not allocated 1o the electric and gas segments for management reporting purposes and therefore are included in "Other Regulated Domestic Utilities."

"* Non-regulated businesses - represents the operations of Resources, its subsidiaries and Alliant Energy's investment in Cargill Alliant, and is broken down into two segments: a) Whiting, an oil and gas production company; and b) other, which includes the operations of the International, Integrated Services, Investments (excluding Whiting), Non-regulated Generation and Trading, Mass Markets and Energy Technologies business units described in Note I(a); an equity stake in an independent telecommunications provider, McLeod; the operations of Resources' parent company; and any non-regulated reconciling/

eliminating entries.

"* Other - includes the operations of Alliant Energy's parent company and Corporate Services, as well as any Alliant Energy parent company reconciling/eliminating entries.

74 ALLIANT ENMRGY 2001 ANNUAL REPORT

Intersegment revenues were not material to Alliant Energy's operations and there was no single customer whose revenues were 10 percent or more of Alliant Energy's consolidated revenues. Refer to Note 9 for a breakdown of Alliant Energy's international investments by country. Certain financial information relating to Alliant Energy's significant business segments and products and services was as follows (in millions):

Regulated Domestic Utilities Non-regulated Businesses Alliant Energy Electric Gas Other Total Whiting Other Total Other Consolidated 2001 Operating revenues

$1,756.6 Depreciation and amortization 245.6 Operating income (loss) 306.1 Interest expense, net of AFUDC Equity income from unconsolidated investments Preferred dividends Miscellaneous, net Income tax expense (benefit)

Cumulative effect of a change in accounting principle, net of tax Net income (loss)

Total assets 3,336.6 Investments in equity method subsidiaries Construction and acquisition expenditures 298.7 Rq Electric 2000 Operating revenues

$1,648.0 Depreciation and amortization 252.6 Operating income (loss) 330.6 Interest expense, net of AFUDC Equity income from unconsolidated investments Preferred dividends Gain on reclassification of investments Gains on sales of McLeod stock Miscellaneous, net Income tax expense Cumulative effect of a change in accounting principle, net of tax Net income (loss)

Total assets 3,402.2 Investments in equity method subsidiaries Construction and acquisition expenditures 265.9

$487.9

$37.1

$2,281.6

$134.6

$366.7

$501.3

($5.6)

$2,777.3 28.8 3.2 277.6 26.9 29.6 56.5 334.1 11.2 7.5 324.8 54.1 (7.0) 47.1 (1.9) 370.0 100.5 100.5 10.0 59.0 69.0 9.8 179.3 (15.6)

(15.6)

(20.2)

(20.2)

(0.1) 6.7 6.7 (25.9)

(25.9)

(11.7) 17.0 5.3 (4.6) 94.2 94.2 15.1 (41.1)

(26.0)

(8.4)

(12.9)

(12.9) 164.9 164.9 40.7 (34.6) 6.1 1.4 506.5 474.7 4,317.8 318.3 1,536.2 1,854.5 75.4 119.2 119.2 539.9 539.9 36.9 5.2 340.8 99.6 338.0 437.6 40.0 (35.9) 6.7 (25.2) 59.8 (12.9) 172.4 6,247.7 659.1 818.4 egulated Domestic Utilities Non-regulated Businesses Alliant Energy Gas Other Total Whiting Other Total Other Consolidated

$415.0

$33.4 $2,096.4

$94.1

$217.2

$311.3

($2.7)

$2,405.0 27.7 3.1 283.4 21.5 17.4 38.9 322.3 26.6 4.5 361.7 30.0 (10.8) 19.2 0.2 381.1 103.1 103.1 7.5 45.8 53.3 8.5 164.9 (0.5)

(0.5)

(18.6)

(18.6)

(19.1) 6.7 6.7 6.7 (321.3)

(321.3)

(321.3)

(23.8)

(23.8)

(23.8)

(23.3)

(23.3)

(7.8)

(13.3)

(21.1)

(2.7)

(47.1) 107.9 107.9 5.4 125.2 130.6 0.3 238.8 16.7 16.7 167.8 167.8 24.9 211.9 236.8 (5.9) 554.4 427.2 4,383.8 256.5 2,076.8 2,333.3 16.7 6.5 6.5 487.3 487.3 35.8 3.0 304.7 137.5 613.2 750.7 11.1 16.7 398.7 6,733.8 493.8 1,066.5 ALLIANT ENERGY 2001 ANNUAL REPORT 75

Notes to Consolidated Financial Statements (continued)

Regulated Domestic Utilities Non-regulated Businesses Alliant Energy Electric Gas Other Total Whiting Other Total Other Consolidated 1999 Operating revenues Depreciation and amortization Operating income (loss)

Interest expense, net of AFUDC Equity (income) loss from unconsolidated investments Preferred dividends Gains on sales of McLeod stock Miscellaneous, net Income tax expense (benefit)

Net income (loss)

Total assets Investments in equity method subsidiaries Construction and acquisition expenditures

$1,548.9

$314.3

$32.1

$1,895.3

$62.6

$172.4

$235.0

($2.3)

$2,128.0 219.3 25.2 2.9 247.4 19.8 11.9 31.7 279.1 345.1 27.4 5.3 377.8 4.7 (6.0)

(1.3) 376.5 100.7 100.7 5.4 19.4 24.8 3.4 128.9 (0.3)

(0.3)

(2.9)

(2.9) 0.2 (3.0) 6.7 6.7 6.7 (40.3)

(40.3)

(40.3)

(5.4)

(5.4)

(10.2)

(17.4)

(27.6) 0.1 (32.9) 115.0 115.0 0.5 6.4 6.9 (1.4) 120.5 161.1 161.1 9.0 28.8 37.8 (2.3) 196.6 3,321.8 477.6 385.2 4,184.6 148.5 1,707.1 1,855.6 35.5 6,075.7 5.7 5.7 74.0 74.0 79.7 246.9 35.5 3.3 285.7 35.2 156.9 192.1 0.8 478.6 Products and Services Non-regulated and Other Revenues Integrated Investments Year Services Whiting Other International Other Total (in millions)

$241.9 172.2 126.0

$134.6 94.1 62.6

$44.7 44.4 47.4

$85.4

$26.3 31.3 28.7

$532.9 342.0 264.7 76 ALLIANT ENERGY 2001 ANNUAL REPORT 2001 2000 1999

(15) RESTATEMENT OF PREVIOUSLY REPORTED 2001 QUARTERLY RESULTS (UNAUDITED)

Alliant Energy's originally reported results for the first three quarters of 2001 were based on the assumption that Southern Hydro's electricity derivatives qualified for hedge accounting. Southern Hydro is a foreign affiliate of Alliant Energy accounted for under the equity method of accounting. Alliant Energy prepared its quarterly financial statements during 2001 based on the independently prepared financial statements of Southern Hydro, which treated these derivatives as qualifying for hedge accounting under SFAS 133.

Upon a further review of the accounting for such derivatives by Alliant Energy during the fourth quarter, it was determined the derivatives did not qualify for hedge accounting and that gains and losses attributable to changes in the fair value of these derivatives should have been recognized in Alliant Energy's earnings in the first three quarters of 2001. As required by accounting principles generally accepted in the U.S., all financial statements for the first three quarters of 2001 of Alliant Energy were restated to reflect this change. Alliant Energy's net income in 2000 and retained earnings at January 1, 2000 were not impacted. Details regarding the changes were as follows (dollars in thousands, except per share amounts):

For the Three Months Ended March 31, 2001 June 30, 2001 September 30, 2001 Originally Originally Originally Reported Restated Reported Restated Reported Restated Income before cumulative effect of a change in accounting principle, net of tax

$33,385

$22,067

$23,300

$37,721

$52,285

$69,331 Cumulative effect of a change in accounting principle, net of tax (12,868)

Net income 33,385 9,199 23,300 37,721 62,285 69,331 Earnings per average common share -diluted:

Income before cumulative effect of a change in accounting principle 0.42 0.28 0.29 0.48 0.78 0.87 Cumulative effect of a change in accounting principle (0.16)

Net income 0.42 0.12 0.29 0.48 0.78 0.87 Retained earnings 812,058 787,872 795,863 786,098 818,629 815,910 The originally reported and restated net income (earnings per average diluted share) for the nine months ended September 30, 2001 were $119.0 million ($1.50 per share) and $116.3 million ($1.47 per share), respectively.

ALLIANT ENERGY 2001 ANNUAL REPORT 77

Notes to Consolidated Financial Statements (continued)

(16) SELECTED CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUD1TED)

All "per share" references refer to earnings per diluted share.

Operating revenues Operating income Income before cumulative effect of a change in accounting principle, net of tax (b)(c)

Cumulative effect of a change in accounting principle, net of tax (b)(c)

Net income (b)(c) 2001 (a) 200 March 31 June 30 Sept. 30 Dec. 31 March 31 June 30 (in millions, except per share data)

$852.7

$611.8

$666.3

$646.5

$574.1

$523.9 89.3 68.0 133.7 79.0 88.4 60.2

)0 Sept. 30 Dec. 31

$603.2

$703.8 140.0 92.5 22.1 37.7 69.3 56.1 19.3 42.3 259.5 60.9 (12.9) 9.2 Earnings per average common share: (b)(c)

Income before cumulative effect of a change in accounting principle 0.28 Cumulative effect of a change in accounting principle (0.16)

Net income 0.12 (a)

(b)

Summation of the individual quarters may not equal annual totals due to rounding.

The first, second, third and fourth quarters of 2001 include non-cash SFAS 133 valuation charges of $0.03 per share, $0.06 per share, $0.16 per share and $0.01 per share, respectively, related to Alliant Energy's exchangeable senior notes. The first, second, third and fourth quarters of 2001 also include non-cash SFAS 133 valuation income (charges) of ($0.30) per share, $0.21 per share, $0.13 per share and ($0.06) per share, respectively, related to electricity derivatives of a foreign affiliate of Alliant Energy, including the cumulative effect charge related to its adoption of SFAS 133 on January 1, 2001.

(c)

The third quarter of 2000 includes $2.58 per share of non-cash income related to Alliant Energy's adoption of SFAS 133 on July 1,2000. The first and fourth quarters of 2000 include $0.09 per share and $0.11 per share, respectively, of net income from gains on sales of McLeod stock.

78 ALLIANT ENERGY 2001 ANNUAL REPORT S..-

16.7 37.7 69.3 56.1 19.3 42.3 276.2 60.9 0.76 0.76 0.48 0.87 0.66 0.24 0.54 3.28 S..-

0.21 0.48 0.87 0.66 0.24 0.54 3.49

Selected Financial and Operating Statistics Financial Information 2001 (1) 2000 (2) 1999(3) 1998(4) 1997 (dollars in thousands, except per share data)

Income Statement Data:

Operating revenues

$2,777,340

$2,404,984

$2,127,973

$2,130,874

$2,300,627 Income before cumulative effect of a change in accounting principle, net of tax 185,230 381,954 196,581 96,675 144,578 Cumulative effect of a change in accounting principle, net of tax (12,868) 16,708 Net income 172,362 398,662 196,581 96,675 144,578 Common Stock Data:

Earnings per average common share - diluted:

Income before cumulative effect of a change in accounting principle

$2.30

$4.82

$2.51

$1.26

$1.90 Cumulative effect of a change in accounting principle

($0.16)

$0.21 Net income

$2.14

$5.03

$2.51

$1.26

$1.90 Common shares outstanding at year-end (O00s) 89,682 79,010 78,984 77,630 76,481 Dividends declared per common share

$2.00

$2.00

$2.00

$2.00

$2.00 Market value per share at year-end

$30.36

$31.88

$27.50

$32.25

$33.13 Book value per share at year-end (5)

$21.39

$25.79

$27.29

$20.69

$21.24 Other Selected Financial Data:

Construction and acquisition expenditures

$818,363

$1,066,464

$478,573

$372,058

$328,040 Total assets at year-end (5)

$6,247,682

$6,733,766

$6,075,683

$4,959,337

$4,923,550 Long-term obligations, net

$2,586,044

$2,128,496

$1,660,558

$1,713,649

$1,604,305 Times interest earned before income taxes (6) 2.32X 4.61X 3.38X 2.25X 2.90X Capitalization ratios:

Common equity (5) 43%

50%

57%

49%

51%

Preferred stock 2%

3%

3%

4%

3%

Long-term debt, excluding current portion 55%

47%

40%

47%

46%

Total 100%

100%

100%

100%

100%

(1) Includes $21 million ($0.26 per diluted share) and $2 million ($0.02 per diluted share) of non-cash SFAS 133 valuation charges related to Alliant Energy's exchangeable senior notes and electricity derivatives of a foreign affiliate of Alliant Energy, respectively.

(2) Includes $204 million ($2.58 per diluted share( of non-cash net income related to Alliant Energy's adoption of SEAS 133 and $16 million

($0.20 per diluted share) of net income from gains on sales of McLeod stock.

(3) Includes $25 million ($0-32 per diluted share) of net income from gains on sales of McLeod stock.

(4) Results reflect the recording of $54 million of pre-tax merger-related charges.

(5) Alliant Energy adjusts the carrying value of its investments in McLeod to its estimated fair value, pursuant to the applicable accounting rules.

At December 31, 2001, 2000, 1999, 1998 and 1997, the carrying amount reflected an unrealized gain (loss) of approximately ($13) million, $543 million,

$1.1 billion, $291 million and $299 million, respectively, with a net of tax increase (decrease) to common equity of ($9) million, $317 million, $640 million,

$170 million and $175 million, respectively.

(6) Represents income before income taxes plus preferred dividend requirements of subsidiaries plus interest expense divided by interest expense.

ALLIANT ENERGY 2001 ANNUAL REPORT 79

Selected Financial and Operating Statistics (continued)

Electric Operating Information (Utility only)

Qnnn l qqq Operating Revenues (O00s):

Residential Commercial Industrial Total from ultimate customers Sales for resale Other Total Electric Sales (OOs MWh):

Residential Commercial Industrial Total from ultimate customers Sales for resale Other Total Customers (End of Period):

Residential Commercial Industrial Other Total Other Selected Electric Data:

Maximum peak hour demand (MW)

Sources of electric energy (000s MWh):

Coal and gas Purchased power Nuclear Other Total Revenue per KWh from ultimate customers (cents)

$599,074 373,145 543,471 1,515,690 184,507

$567,283 349,019 501,155 1,417,457 173,148 57.431

$541,714 329,487 476,140 1,347,341 155,801 45.796

$532,676 317,704 477,241 1,327,621 199,128 40,693

$521,574 307,941 455,912 1,285,427 192,346 37,980

$1,756,556

$1,648,036

$1,548,938

$1,567,442

$1,515,753 7,344 7,161 7,024 6,826 6,851 5,464 5,364 5,260 4,943 4,844 12,469 13,092 13,036 12,718 12,320 25,277 25,617 25,320 24,487 24,015 4,936 4,906 5,566 7,189 6,768 168 174 162 158 161 30,381 30,697 31,048 31,834 30,944 807,754 799,603 790,669 781,127 772,100 125,539 123,833 122,509 121,027 119,463 2,826 2,773 2,730 2,618 2,555 3,324 3,316 3,282 3,267 3,281 939,443 929,525 919,190 908,039 897,399 5,677 5,397 5,233 5,228 5,045 18,662 19,139 19,078 19,119 17,423 8,727 8,058 8,619 10,033 10,660 4,116 4,675 4,362 4,201 3,874 452 427 528 504 565 31,957 32,299 32,587 33,857 32,522 6.00 5.53 5.32 5.42 5.35 Gas Operating Information (Utilty oly) 2001 2000 1999 1998 1997 Operating Revenues (O00s):

Residential

$270,248 Commercial Irl,itI Industrial 31,262 Transportation/other 45,246 Total

$487,877 Gas Sales (OOs Dths):

Residential 29,580 Commercial 18,055 Industrial 5,344 Transportation/other 48,539 Total 101,518 Customers at End of Period (Excluding Transportation/Other):

Residential 353,430 Commercial 45,480 Industrial 951 Total 399,861 Other Selected Gas Data:

Revenue per Dth sold (excluding transportation/other)

$8.35 Purchased gas costs per Dth sold (excluding transportation/other)

$6.81

$245,697 127,104 27,752 14,395

$41 4.948

$185,090 89,118 21,855 18,256

$314,319

$175,603 85,842 20,204 13,941

$295,590

$225,542 115,858 27,393 25,114

$393,907 32,026 30,309 28,378 33,894 19,696 18,349 17,760 21,142 5,350 5,963 5,507 6,217 43,931 46,954 52,389 56,719 101,003 101,575 104,034 117,972 351,990 347,533 342,586 337,956 44,654 44,289 43,825 43,316 953 1,037 982 963 397,597 392,859 387,393 382,235

$7.02

$4.88

$5.42

$3.30

$5.45

$3.22

$6.02

$4.23 80 ALLIANT ENERGY 2001 ANNUAL REPORT 1999 1 917

,?nnn 1 CICIQ I. to V I 1998

Definitions Certain abbreviations or acronyms used in the text and notes of this report are defined below:

Abrvito or Acoy Definitis AFUDC....................................

Alliant Energy..............................

A TC......................................

Cargill....................................

Cargill-Alliant..............................

Corporate Services...........................

DA EC.....................................

D N R......................................

D th................

EA C......................................

Enron.....................................

EPA......................................

FA SB.....................................

FERC.....................................

IC C................................

IESU.....................................

IP C....

IP& L.....................................

ISO.............

IU B....

Kew aunee..................................

KW h.....................................

M A IN.....................................

M cLeod...................................

M G P.....................................

M PU C....................................

M W......................................

M W h.....................................

N EPA.....................................

N Ox......................................

N R C......................................

PSCW....................................

PUHCA...................................

Resources..................................

SEC.....................................

"SIA S.....................................

SFA S 133..................................

South Beloit................................

Southern Hydro.............................

STB......................................

TRANSLink................................

Union Pacific...............................

U.S......................................

W hiting...................................

W NRB....................................

W P& L....................................

W UHCA...................................

Allowance for Funds Used During Construction Alliant Energy Corporation American Transmission Company, LLC Cargill Incorporated Cargill-Alliant, LLC Alliant Energy Corporate Services, Inc.

Duane Arnold Energy Center Department of Natural Resources Dekatherm Energy Adjustment Clause Enron Corporation U.S. Environmental Protection Agency Financial Accounting Standards Board Federal Energy Regulatory Commission Illinois Commerce Commission IES Utilities Inc.

Interstate Power Company Interstate Power and Light Company Independent System Operator Iowa Utilities Board Kewaunee Nuclear Power Plant Kilowatt-Hour Mid-America Interconnected Network, Inc.

McLeodUSA Incorporated Manufactured Gas Plants Minnesota Public Utilities Commission Megawatt Megawatt-Hour National Energy Policy Act of 1992 Nitrogen Oxides Nuclear Regulatory Commission Public Service Commission of Wisconsin Public Utility Holding Company Act of 1935 Alliant Energy Resources, Inc.

Securities and Exchange Commission Statement of Financial Accounting Standards Accounting for Derivative Instruments and Hedging Activities South Beloit Water, Gas & Electric Company Southern Hydro Partnership U.S. Surface Transportation Board TRANSLink Transmission Company LLC Union Pacific Railroad United States Whiting Petroleum Corporation Wisconsin Natural Resources Board Wisconsin Power and Light Company Wisconsin Utility Holding Company Act ALLIANT ENERGY 2001 ANNUAL REPORT 8]

BOARD OF DIRECTORS Erroll B. Davis, Jr.

Chairman of the Board Director since 1982 Age 57 Mr. Davis became President and Chief Executive Officer of Alliant Energy Corp. when the company was formed in 1998 by the merger of WPL Holdings, Inc., IES Industries Inc. and Interstate Power Company. He became Chairman of the Board in 2000. He first joined Wisconsin Power and Light Co. (a subsidiary of Alliant Energy) in 1978. In June 2002, Mr. Davis will become Chair of the Edison Electric Institute (EEI), the worldwide trade association for investor-owned electric utilities. In 2001, he was appointed to the U.S. Department of Energy's Electricity Advisory Board. He also serves on the Boards of BP Amoco p.l.c., PPG Industries, Inc. and Electric Power Research Institute.

Lee Liu Vice Chairman of the Board Director since 1981 Age 68 SMr. Liu served as Chairman of the Board of the company from April 1998 until April 2000. He was Chairman of the Board and Chief Executive Officer of IES Industries Inc. (a predeces sor of Alliant Energy) prior to 1998. Mr. Liu held a number of professional, management and executive positions after joining the former Iowa Electric Light and Power Co. in 1957. He is a Director of Principal Financial Group and Eastman Chemical Company.

Alan B. Arends Director since 1993 Mr. Arends is Chairman of the Board of Albert Lea, Minn.

based Alliance Benefit Group Financial Services Corp., an employee benefits company that he founded in 1983.

Jack B. Evans Director since 2000 Age 53 E

Since 1996, Mr. Evans has served as a Director and President of The Hall-Perrine Foundation, a private philanthropic corporation in Cedar Rapids, Iowa. Previously, Mr. Evans was President and Chief Operating Officer of SCI Financial Group, Inc., a regional financial services firm. Mr. Evans is a Director of Gazette Communications, the Federal Reserve Bank of Chicago and Nuveen Institutional Advisory Corp., and Vice Chairman and a Director of United Fire and Casualty Company.

Joyce L. Hanes Director since 1982 Age 69 Ms. Hanes has been a Director of Midwest Wholesale, Inc.,

a products wholesaler in Mason City, Iowa, since 1970 and Board Chair since December 1997, having previously served as Chair from 1986 to 1988. She is also a Director of Iowa Student Loan Liquidity Corp.

Katharine C. Lyall Director since 1986 Singleton B. McAllister Director since 2001 Age 49 Ms. McAllister is a partner with Patton Boggs LLP, a Washington, D.C.-based law firm working in the public policy and business law areas. From 1996 until early 2001, Ms.

McAllister was General Counsel for the United States Agency for International Development. She was also a partner at Reed, Smith, Shaw and McClay, where she specialized in government relations and corporate law.

David A. Perdue Director since 2001 MMr.

Perdue is President and Chief Executive Officer of the Reebok Brand for Reebok International Limited, a designer, distributor and marketer of footwear, apparel and sports equipment, located in Canton, Mass. Prior to Sjoining Reebok in 1998, he was Senior Vice President of Operations at Haggar, Inc.

Judith D. Pyle Director since 1992 Age 58 MMs.

Pyle is Vice Chair of The Pyle Group, a financial services company located in Madison, Wis. Prior to assuming her current position, Ms. Pyle served as Vice Chair and Senior Vice President of Corporate Marketing of Rayovac Corp. (a battery and lighting products manufacturer) based in Madison, Wis.

In addition, Ms. Pyle is Vice Chair of Georgette Klinger, Inc. and a Director of Uniek, Inc.

Robert W. Schlutz Director since 1989 Age 65 Mr. Schlutz is President of Schlutz Enterprises, a diversified farming and retailing business in Columbus Junction, Iowa.

Wayne H. Stoppelmoor Director since 1986 Age 67 Mr. Stoppelmoor served as Vice Chairman of the Board of the company from April 1998 until April 2000. He was Chairman, President and Chief Executive Officer of Interstate Power Company (a predecessor of Alliant Energy) from 1986 until his retirement in 1997.

Anthony R. Weiler Director since 1979 Age 65 Mr. Weiler is a consultant for several home furnishings organi zations. Prior to assuming his current position, Mr. Weiler had been a Senior Vice President for Heilig-Meyers Company, a national furniture retailer headquartered in Richmond, Va. He is a Director of the Retail Home Furnishings Foundation.

Age 60 E

Ms. Lyall is President of the University of Wisconsin System in Madison, Wis. In addition to her administrative position, she is a professor of economics at the University of Wisconsin Madison. She serves on the Boards of Directors of the Kemper National Insurance Companies, M&I Corporation and the Carnegie Foundation for the Advancement of Teaching.

Ages of directors are as of Dec. 31, 2001. Each election date represents the first year of Board affiliation with a company that ultimately became part of the Alliant Energy family.

82 ALLIANT ENERGY 2001 ANNUAL REPORT Age 52 Age 68

2002 Committees of the Board Audit Committee Jack B. Evans (Chair)

Alan B. Arends Katharine C. Lyall Singleton B. McAllister Judith D. Pyle Compensation and Personnel Committee Judith D. Pyle [Chair)

Alan B. Arends Jack B. Evans David A. Perdue Nominating and Governance Committee Anthony R. Weiler [Chair)

Joyce L. Hanes Katharine C. Lyall Singleton B. McAllister Robert W. Schlutz Environmental, Nuclear, Health and Safety Committee Robert W. Schlutz (Chair)

Joyce L. Hanes David A. Perdue Anthony R. Weiler Capital Approval Committee Erroll B. Davis, Jr. (Chair)*

Jack B. Evans Judith D. Pyle Anthony R. Weiler

  • Non-voting committee trember Alliant Energy Corporation Officers Erroll B. Davis, Jr., 57 [1978]

Chairman, President and Chief Executive Officer William D. Harvey, 52 [1986]

Executive Vice President Generation (President, Wisconsin Power and Light Company)

James E. Hoffman, 48 [1995]

Executive Vice President Business Development (President, Alliant Energy Resources, Inc.)

Eliot G. Protsch, 48 [1978]

Executive Vice President Energy Delivery (President, Interstate Power and Light Company)

Barbara J. Swan, 50 [1987]

Executive Vice President and General Counsel Thomas M. Walker, 54 [1996]

Executive Vice President and Chief Financial Officer Pamela J. Wegner, 54 [1993]

Executive Vice President Shared Solutions (President, Alliant Energy Corporate Services, Inc.)

Edward M. Gleason, 61 [1977]'

Vice President-Treasurer and Corporate Secretary Dundeana K. Langer, 43 [1984]

Vice President-Infrastructure Security John E. Kratchmer, 39 [1985]

Corporate Controller and Chief Accounting Officer Joan M. Thompson, 44 [1977]

Assistant Controller Linda J. Wentzel, 53 [1978]

Assistant Corporate Secretary Enrique Bacalao, 52 [1998]

Assistant Treasurer Eric D. Mott, 34 [1996]

Assistant Treasurer Alliant Energy Corporate Services Officers*

Erroll B. Davis, Jr., 57 [1978]

Chairman and Chief Executive Officer Pamela J. Wegner, 54 [1993]

President William D. Harvey, 52 [1986]

Executive Vice President Generation James E. Hoffman, 48 [1995]

Executive Vice President Business Development Eliot G. Protsch, 48 [1978]

Executive Vice President Energy Delivery Barbara J. Swan, 50 [1987]

Executive Vice President and General Counsel Thomas M. Walker, 54 [1996]

Executive Vice President and Chief Financial Officer Vern A. Gebhart, Jr. 48 [1975]

Vice President-Customer Operations Edward M. Gleason, 61 [1977]';"

Vice President-Treasurer and Corporate Secretary Dundeana K. Langer, 43 [1984]

Vice President-Infrastructure Security Daniel L. Mineck, 53 [1970]

Vice President-Performance Engineering and Environmental Kim K. Zuhlke, 48 [1978]

Vice President-Engineering, Sales and Marketing John E. Kratchmer, 39 [1985]

Corporate Controller and Chief Accounting Officer Kent M. Ragsdale, 52 [1985]

Assistant Corporate Secretary Linda J. Wentzel, 53 [1978]

Assistant Corporate Secretary Enrique Bacalao, 52 [1998]

Assistant Treasurer Steven F. Price, 49 [1984]

Assistant Treasurer Alliant Energy Resources Officers**

Erroll B. Davis, Jr., 57 [1978]

Chairman and Chief Executive Officer James E. Hoffman, 48 [1995]

President William D. Harvey, 52 [1986]

Executive Vice President Eliot G. Protsch, 48 [1978]

Executive Vice President Thomas M. Walker, 54 [1996]

Chief Financial Officer Thomas L. Aller, 52 [1993]

Vice President

[President, Alliant Energy Investments, Inc.)

Charles Castine, 52 [1998]

Vice President (President, Alliant Energy Integrated Services Company)

Dundeana K. Langer, 43 [1984]

Vice President-Infrastructure Security Michael P. Maley, 43 [2001]

Vice President (President, Alliant Energy Generation, Inc.)

Edward M. Gleason, 61 [1977]'

Vice President-Treasurer and Corporate Secretary John K. Peterson, 49 [1998]

Vice President

[President, Alliant Energy International, Inc.)

John E. Kratchmer, 39 [1985]

Corporate Controller and Chief Accounting Officer Daniel L. Siegfried, 41 [1992]

Assistant Corporate Secretary Linda J. Wentzel, 53 [1978]

Assistant Corporate Secretary Enrique Bacalao, 52 [1998]

Assistant Treasurer Steven F. Price, 49 [1984]

Assistant Treasurer Ages of officers are as of Dec. 31, 2001.

Dates in brackets represent the year each person joined a company that ultinmately hecame part of the Alliant Energy family.

  • Alliant Energy Corporate Services, Inc. provides internal support to all business units within the coprtany.

-Alliant Energy Resources, Inc. is the parent of the company's non-regulated businesses.

  • Mr. Gleason retired on March 31, 2002. On April 3, 2002, Thomas L. Hanson assumed the position of Vice President-Treasurer, and F 2.

rBui became Coqrorate Secretary.

ALLIANT ENERGY 2001 ANNUAL REPORT 83

S HAR EOWN E R INFORMATION STOCK EXCHANGE LISTINGS Stock Trading Newspaper exchange symbol abbreviation Alliant Energy -

Common New York LNT AlliantEngy Stock Exchange Wisconsin Power American WIS.p WI P&L pf and Light Company Stock Exchange 4.50% Preferred All other Wisconsin Power and Light Company preferred series and all preferred series of Interstate Power and Light Company (formerly IES Utilities Inc. and Interstate Power Company) are traded on the over-the-counter market.

COMMON STOCK QUARTERLY PRICE RANGES AND DIVIDENDS 2001 2000 Quarter High Low Dividend High Low Dividend First

$ 33.20

$ 28.75

$.50

$37.75

$26.44

$0.50 Second

$ 32.67

$ 28.20

.50

$31.88

$25.75

.50 Third

$31.49

$27.90

.50

$31.25

$26.13

.50 Fourth

$32.29

$ 27.50

.50

$32.13

$28.63

.50 Year

$ 33.20

$ 27.50

$2.00

$37.75

$25.75

$2.00 Alliant Energy Corporation 2001 year-end common stock price: $30.36 Alliant Energy Corporation had 58,288 share owners as of Dec. 31, 2001. Shareowner records are maintained in the corporate general office in Madison, Wis.

Street-name accounts Shareowners whose stock is held by banks or brokerage firms and who wish to receive quarterly reports directly from the company should contact Shareowner Services to be placed on the mailing list. Reports may also be obtained through the investor section of our Web site.

Annual meeting The 2002 Annual Meeting of Shareowners will be held at the U.S. Cellular Center, Cedar Rapids, Iowa, on Wednesday, May 15, 2002, at 1 p.m., Central Daylight Time.

Form 10-K information Upon request, the company will provide, without charge, copies of the Annual Report on Form 10-K for the year ended Dec. 31, 2001, as filed with the Securities and Exchange Commission. All reports filed with the SEC are also available through the investor section of our Web site.

Analyst inquiries Inquiries from the financial community may be directed to:

Eric Molt Assistant Treasurer P.O. Box 77007 Madison, WI 53707-1007 Phone: (608) 458-3391 Fax: (608) 458-4824 E-mail: ericmott@alliantenergy.com Stock transfer agent and registrar For Alliant Energy common stock and all preferred stock of Wisconsin Power and Light Company and Interstate Power and Light Company, contact:

Alliant Energy Corporation Attn: Shareowner Services P.O. Box 2568 Madison, WI 53701-2568 Written inquiries should be mailed to this address as well.

Duplicate mailings If you receive duplicate mailings of proxies, dividend checks or other mailings because of slight differences in the registration of your accounts, please call Shareowner Services for instructions on combining your accounts. To reduce the volume of paper you receive from us, you may wish to consider electronic access.

Electronic access Electronic access allows you to obtain our annual report and proxy statements by using the Internet. Setup is easy and can be done by calling Shareowner Services. You will still receive account-related information by mail (e.g., checks and statements).

Shareowner information The company's annual report and quarterly newsletter focus on the shareowner audience.

Your questions and ideas are always welcome.

Please direct them to Shareowner Services.

Shareowner direct plan The Plan is available to all shareowners of record, first-time investors, customers, vendors and employees. Through the Plan, shareowners may buy common stock directly through the company without paying any brokerage commissions, fees or service charges.

Full details are in the prospectus, which can be obtained through our Web site or by calling Shareowner Services.

Direct deposit Shareowners who are not reinvesting their dividends through the Plan may choose to have their quarterly dividend electronically deposited in their checking or savings account through this service. Electronic deposit may be arranged by contacting Shareowner Services.

Shareowner services The company's Shareowner Services representatives are available to assist you from 8:30 a.m. to 4:30 p.m. (Central Standard Time) each business day.

Madison, Wis., area: (608) 458-3110 Toll-free: 1-800-356-5343 Internet address: ivww.alliantcnergy.com (click on "Investors")

84 ALLIANT ENERGY 2001 ANNUAL REPORT

Our Vision To be the customer's first choice for energy solutions.

Our Mission To exceed the customer's expectations for comfort, security and productivity around the world.

The Alliant Energy Way We value S.E.R.V.I.C.E.

Safety. We do not compromise the safety of employees or the general public.

Employees. We value a diverse workplace that fosters employee growth and development.

Responsibility. We are committed to the environment and the communities we are privileged to serve.

Value. We create value for our shareowners and focus on profitable growth.

Integrity. We vow to be ethical, open and honest.

We maintain personal accountability for our actions and behavior.

Customer Focus. We are results-oriented and deliver on our promises.

Excellence. We value operational excellence and encourage innovation and creativity. We act quickly and are willing to embrace changes and take risks in pursuit of excellence.

Alliant Energy Worldwide Headquarters 4902 N. Biltmore Lane P.O. Box 77007 Madison, WI 53707-1007 General information: 1.800.ALLIANT Shareowner services: 1.800.356.5343 Operating Headquarters 200 First St. S.E.

Cedar Rapids, IA 52401 1.800.373.1303 1000 Main St.

Dubuque, IA 52001 1.800.611.9330 Current information about Alliant Energy is available on the Web at wu,wu,.aIliantenergy.com.

LN T The common stock of Alliant Energy Corp. is traded on NYSE.

the New York Stock Exchange under the symbol LNT ALLIANT ENERGY,.

We're on for you 71-0973 101165 3/02 135M

© 2002 Alliant Energy