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December 2, 2004 Congestion Causes and Effects Follow – up Issues

December 2, 2004 Congestion Causes and Effects Follow – up Issues. Presented to WMS March 16, 2005 Beth Garza. Issue Statement.

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December 2, 2004 Congestion Causes and Effects Follow – up Issues

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  1. December 2, 2004 CongestionCauses and EffectsFollow – up Issues Presented to WMS March 16, 2005 Beth Garza

  2. Issue Statement Transmission Outages on Dec 2 & 3 lowered the NE-N CSC limit to a level where TCRs became very valuable and payments to TCR holders exceeded congestion payments by over $6 M which was uplifted through BENA

  3. Additional Issues • Investigate the possibility of increasing mandatory DBES minimum bid percentage when zonal congestion is anticipated. • Provide the status of East DC tie during the morning of December 2, 2004 • Compare actual vs. scheduled generation for the morning of December 2, 2004.

  4. Increase Mandatory DBES Bid percentage • Per Protocol, mandatory DBES percentage is posted at 0600 Day Ahead • Daily CSC limit calculation is completed at 1800 (+/-) Day Ahead

  5. DBES Options • Modify calculation to determine mandatory DBES requirement per zone Current Process: • Select monthly percentage to cover 99.9% of expected ERCOT wide DBES requirements • Exhausted DBES stack in 54 intervals (0.15%) during 2004 • Adjust the mandatory DBES requirement intra-day. • Similar to opening an Adjustment Period Ancillary Service market except this would be increase demand, not call for additional supply.

  6. DBES Options • Implement Functional Replacement market (Release 4) • Implement project to automate CSC limit calculation (PR-30084) • Project is in early stages of Planning • Execution not expected prior to June • With a more automated process it may be possible to perform additional CSC limits calculations

  7. DC_ East TieSchedule vs Actual FlowDecember 2, 2004

  8. Scheduled vs. Actual generation

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