December 2 2004 congestion causes and effects follow up issues
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December 2, 2004 Congestion Causes and Effects Follow – up Issues PowerPoint PPT Presentation


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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

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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


    Dc east tie schedule vs actual flow december 2 2004

    DC_ East TieSchedule vs Actual FlowDecember 2, 2004


    Scheduled vs actual generation

    Scheduled vs. Actual generation


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