december 2 2004 congestion causes and effects follow up issues
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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

December 2, 2004 CongestionCauses and EffectsFollow – up Issues

Presented to WMS

March 16, 2005

Beth Garza

issue statement
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

additional issues
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.
increase mandatory dbes bid percentage
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
dbes options
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.
dbes options1
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
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