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Supporting Reliability Through Fleet VDIs Presentation to ERCOT’s TAC – March 4 th , 2010 R. Jones

Supporting Reliability Through Fleet VDIs Presentation to ERCOT’s TAC – March 4 th , 2010 R. Jones. Supporting Reliability Through Fleet VDIs*. Period Examined : 1 October 2009 thru 9 February 2010 System-Wide Fleet VDIs: 68 Caused by Low Frequency: 38

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Supporting Reliability Through Fleet VDIs Presentation to ERCOT’s TAC – March 4 th , 2010 R. Jones

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  1. Supporting Reliability Through Fleet VDIs Presentation to ERCOT’s TAC – March 4th, 2010 R. Jones

  2. Supporting Reliability Through Fleet VDIs* • Period Examined: 1 October 2009 thru 9 February 2010 • System-Wide Fleet VDIs: 68 • Caused by Low Frequency: 38 • Caused by High Frequency: 30 (four attributed to intermittent renewable but other operator log entries not specific enough to tell) • One Large Fleet’s Share: 32 • Max. Up: 500 MWs • Max. Dwn: 500 MWs VDI-Verbal Dispatch Instruction, Protocols 5.4.2.1

  3. Points to Consider • When ERCOT runs out of Reg Up or Reg Dwn due to deployment timeline constraints, Fleet VDIs represent quick and easy solution to missed net-load forecasts • ERCOT ran out of regulation in 42 intervals in January (A/S Methodology assumes that ERCOT will exceed Reg only 35 intervals/month, achieves a 98.8% coverage) • The three largest fleets represent “easy marks” for this “service” • Compensation for Fleet VDIs is provided through OOM settlement formulas • Many times MCPE is moving in a direction opposite the Fleet VDI direction • Ex: On Oct 8th from 11:00 to 11:15 a Fleet VDI was issued to a party for a down 200 MW move, MCPE for the interval was $262.54, a big opportunity cost to that fleet for supporting system frequency • VDIs regularly cause QSEs to violate their operating reserve obligations

  4. Points to Consider • Loads pay for Fleet VDIs through uplift charges until the Regulation Procurement methodology picks up the requirement through past 30 days/same month last year historical approach, so for some period of time these Regulation Costs are hidden from the market • As more IRRs appear in the market and Regulation Service requirements become even more critical in covering more intermittency, how much more of the “Fleet VDI Service” will that One Large Fleet be expected to provide? • ERCOT as a Balancing Authority is considered a NERC Reserve Sharing Group and Standard BAL-002-0 requires in R2.2 that Contingency Reserves be allocated among the members of the Group. We’re not seeing much sharing going on with the Fleet VDIs….

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