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Supplemental Ancillary Service Market (SASM) Ancillary Services (AS) Offers Update

Supplemental Ancillary Service Market (SASM) Ancillary Services (AS) Offers Update ERCOT Market Analysis QSE Managers Working Group 10/7/2013. SASM Background. SASM is executed at 0900 each day

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Supplemental Ancillary Service Market (SASM) Ancillary Services (AS) Offers Update

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  1. Supplemental Ancillary Service Market (SASM) Ancillary Services (AS) Offers Update ERCOT Market Analysis QSE Managers Working Group 10/7/2013

  2. SASM Background • SASM is executed at 0900 each day • NPRR 397 (Approved 4/17/2012) allows entities the ability to “buy back” their responsibilities from the market closer to Real-Time • Based on the data analyzed, market participants are utilizing this ability • Reconfiguration SASMs will be cancelled if there are insufficient AS Offers to cover the total requested amount

  3. SASM Clearing History – 2013 Data from Last Meeting Observations • When a SASM is executed, the requirement per hour is typically < 50 MW • Some SASMs in February, March, and April with 0 MW awards

  4. SASM Clearing History – Data Since Last QMWG Meeting Observations • When a SASM is executed, the requirement per hour is typically < 50 MW • No SASMs with 0 MW awards, but still many with insufficiency • At this time ERCOT recognizes that insufficiencies exist, and ERCOT will consider using RUC to resolve these insufficiencies. • If stakeholders would like to modify this approach, please provide suggestions.

  5. SASM AS Offers – Sample Operating Day • 24 Hours of SASM offers for one operating day * OD = Operating Day

  6. SASM AS Offers – Sample for Hour 1800 • Offers for one hour (e.g. 1800) changes over time beginning in Day Ahead Adjustment Period Expiring AS Offers DAM DAM Awards * DAM = Day Ahead Market

  7. SASM AS Offers – February to September 2013

  8. SASM AS Offers Conclusions Observations • Most AS Offers expire or are canceled by the start of the Adjustment Period • Very low quantities of AS Offers for Regulation Up/Down Charge for Failure to Provide AS Requirements • Max(MCPC)m * FQ • MCPC = Market Clearing Prices for Capacity • FQ = Failure Quantity • m = Day Ahead Market (DAM) and all SASM markets for that hour • Charge applies regardless of SASM execution or SASM award quantity

  9. QUESTIONS / COMMENTS???

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