ML19270D578

M190925: Ferc/Nrc/Regional Entity Inquiry Report on the South Central U.S. Cold Weather Bulk Electric System Event on January 17, 2018

ML19270D578
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Issue date:	09/25/2019
From:	NRC/OCM
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M190925
Download: ML19270D578 (14)

Text

ERC/NERC/Regional Entity Inquiry eport on the South Central U.S.

0ld Weather Bulk Electric Systein EventofJanuary17,2018 Dave Huff Office of Electric Reliability

-=September 25, 2019 888

Disclaimer The views expressed herein are mine, and do not necessarily reflect the views of the Commission, individual Commissioners, Commission staff, or individual Commission staff members 2

Inquiry Commencement D Event on January 17, 2018, was triggered by high loads due to extreme cold in a portion of South Central U.S.

D Joint Inquiry initiated on September 12, 2018 FERC staff: (OER, OE, OEMR, OEPI, OGC)

NERC, Applicable Regional Entities' staffs 3

Extreme Cold Across South Central U.S.

4

Widespread Generation Outages - January 17 MISO South 41.800 MW SeRC SPP TVA RC TOTAL 118,100 MW 5

Large Power Transfers Occurred D Increased customer electricity demand due to extreme low temperatures D MISO's Regional Directional Transfer D Remote generation power transfers, including dispatch of wind generation D Transfers between SPP and the ERCOT Interconnection 6

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Summary of Findings D As temperatures decreased, unplanned outages increased D 44% of outages were directly attributed to, or likely related to, extreme cold weather D Gas supply issues contributed to the Event D One-third of Generator Owner/Operators did not have winterization procedures 8

Summary of Findings D The Relevant RCs (MISO, SPP, 1VA and SeRC) had situational awareness D The generation outages on January 17 created energy emergency conditions which required voluntary load reduction D Firm load shed needed, if next worst single contingency in MISO South occurred 9

13 Recommendations D Generator Cold Weather Reliability (1)

• The need for Generator Owners/Operators to perform winterization activities on generating units to prepare for adverse cold weather

• The need for Generator Owners/Operators to ensure accuracy of their generating units' ambient temperature design specifications 10

13 Recommendations D Generator Cold Weather Reliability (1), continued:

• The need for Balancing Authorities and Reliability Coordinators to be aware of specific generating units' limitations, such as ambient temperatures beyond which they cannot be expected to perform 11

13 Recommendations D Transmission and Reserves (12), including:

• Reliability Coordinators should perform real-time voltage stability analysis in addition to RTCA, for constrained conditions occurring within their own and/ or within adjacent Reliability Coordinator areas, such as those experienced by MISO the morning of January 17, and communicate the results of their analysis to adjacent Reliability Coordinator areas 12

13 Recommendations D Transmission and Reserves (12), including:

• Planning Coordinators and Transmission Planners should jointly develop and study more-extreme condition scenarios to be better prepared for seasonal extreme conditions

• Balancing Authorities should consider deliverability of reserves to avoid stranded reserves D Multiple sound practices by the entities were also identified 13

Questions?

12*