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Hurricane Rita

Hurricane Rita. ERCOT Preparation. ERCOT started alerts to QSEs and TOs on 9/21 Did a site failover of EMMS system Austin Taylor Procured satellite voice communications between ERCOT and TOs in impact area Cancelled planned transmission outages as of Friday, 9/23

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Hurricane Rita

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  1. Hurricane Rita

  2. ERCOT Preparation • ERCOT started alerts to QSEs and TOs on 9/21 • Did a site failover of EMMS system Austin Taylor • Procured satellite voice communications between ERCOT and TOs in impact area • Cancelled planned transmission outages as of Friday, 9/23 • Delayed scheduled implementation of Release 4 on 9/28 • Requested QSEs to: • Staff all plants unless safety dictated otherwise • Notify ERCOT of all evacuated plants • Keep Resource Plans, Schedules, Bids up to date • Bid in all available capacity into BES market, particularly DBES • Be prepared to take plants off line quickly if requested by ERCOT

  3. ERCOT Preparation (cont.) • Distributed frequency control guidelines to all QSEs and Generators in case of loss of communication ERCOT QSE Generator • Created link for hurricane updates on ercot.com • Scheduled MP conference calls for September 23, 24, 25 • Set up separate 24-hour phone hot lines for media and market participants for issues not concerning real time operations beginning 9/23 • Arranged for extra ERCOT System Operators and Supervisors to come in if needed • Stated intent to keep market operating as long as possible

  4. Rita Track 50 MPH 120 MPH

  5. ERCOT Customer Outages • Customer outages started 17:00 on 9/23 in Galveston/Houston (CenterPoint)– hit a peak of 715,000 at 07:00 9/24 • Customer outages started 06:00 on 9/24 in Lufkin/Nacogdoches/Tyler (TXUED) – up to 70,000 customers ultimately affected • Vast majority of customer outages due to distribution system damage • Service to almost all customers in ERCOT restored by 9/30

  6. ERCOT Transmission and Generation Outages • Transmission • 16 - 138KV lines • 1 – 138/69KV autotransformer • 9 – 69 KV lines • 1 – 69 KV substation • All back in service by 06:00 9/28 • No 345 KV outages • Generation • One plant (76 MW) forced out by storm • Twelve of 30 plants in Houston area were shut down before the storm

  7. ERCOT Summary • The ERCOT system remained stable throughout the storm • No significant communications problems with Market Participants • ERCOT market systems functioned normally • Experienced record September peak temperatures and demands in the four days following the storm without operational problems However …………

  8. Entergy Hit Very Hard • Transmission Outages – 82% of system • 4 – 500 KV lines • 28 – 230 KV lines • 87 – 138 KV lines • 161 – 69 KV lines • 293 substations • Affected 300,000 Entergy Texas customers • East Texas was isolated from rest of Entergy system • Generation deficient in East Texas

  9. Block Load Transfers (BLTs) • On 9/25 discussions started about possibility of BLTs from Entergy to ERCOT • Decision to close normally open 138 KV tie between CenterPoint and Entergy at Crosby • Critical Houston water supply pumps on Trinity river • Line energized the evening of 9/26 • Entergy started putting load on line on 9/27 • Limit ~ 175 MW • 138 KV tie established between TXUED and Deep East Texas Electric Coop at Huntington • Energized on 10/1 • Limit ~ 40 MW

  10. State and Federal Action • On 9/26 the State Emergency Operations Center created a Tiger Team to determine how service can be restored in East Texas ASAP • Actions: • Governor issued order suspending eminent domain requirements for temporary facilities • On 9/27 PUCT issued order suspending CCN requirements and allowing ERCOT TDSPs to extend service in area • DOE agreed to issue order maintaining ERCOT’s FERC exemption for these emergency connections

  11. Commercial Impact of Hurricane Rita

  12. BLT Settlements • Section 5.7 of Protocols define requirements for BLT events • Two BLT points were implemented • Each BLT is: • Initiated with a specific Dispatch Instruction • A wholesale delivery point(s) defined by an ESIID • Metered with an interval data recorder installed • Associated with a Load Serving Entity (LSE) • Represented by a Qualified Scheduling Entity (QSE)

  13. BLT Settlements • Estimated aggregate load is 100 to 150 MW • For Settlement purposes, the BLTs are: • Treated as non-competitive wholesale load • Transmission losses are applied • No UFE is applied • Settled as load in the Congestion Zone in which their ESIID is located • BLTs are excluded from 4CP calculations

  14. Other Commercial Impacts due to Rita • Initial settlement has only about 40% of meter reads available • Profiled ESIIDs use most recent usage for profile scaling factor • IDR ESIIDs may be estimated with prior period • Final & True-Up settlement have over 99% of meter reads available • Profiled ESIIDs will use meter reads covering period. However, application of usage to profile will result in load being assigned during outages • IDR ESIIDs will use actual data available covering the period and will reflect what actually occurred for the ESIID

  15. Other Commercial Impacts due to Rita • Mass evacuation impacted UFE even before hurricane struck • UFE = Generation – (Load + Losses) • Negative UFE means load is overestimated • Positive UFE means load is underestimated • UFE may be created in a region but is allocated ERCOT-wide according to Protocols

  16. UFE on September 24, 2005

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