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Background on RUC Process and Non-Spin Deployment Procedure

Background on RUC Process and Non-Spin Deployment Procedure. John Dumas Director Wholesale Market Operations. Outline of Presentation. Review RUC process Review RUC data for 7-13 and 7-18 Review Non-Spin Deployment Criteria. General Info on RUC Process.

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Background on RUC Process and Non-Spin Deployment Procedure

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  1. Background on RUC Process and Non-Spin Deployment Procedure John Dumas Director Wholesale Market Operations Reliability Deployments Task Force Meeting

  2. Outline of Presentation • Review RUC process • Review RUC data for 7-13 and 7-18 • Review Non-Spin Deployment Criteria

  3. General Info on RUC Process • RUC Process recommends commitments or de-commitments of Generation Resources to ensure that there is enough Resource and Ancillary Service capacity, committed in the right locations, to reliably serve the forecasted Load on the ERCOT system. • Ramp Rates not considered. • Operator makes final decision. • Commitments are not made until necessary. Example: At 10 am RUC software suggests we need unit X for hour 16 and 17. Start up time is 1 hour. Operator does not commit at 10 am.

  4. Inputs to RUC • COP info on availability and HSL of Resources • Three Part Supply Offers (Only start-up and min energy used) • Resource Limits [minimum online time, minimum downtime ….] • Short Term Wind Forecast (COP HSLs reflect WGRPP values) • Load Forecast (reduced by bias shown on following slide) {1259 MW}

  5. How Resources are selected: • In evaluating a Resource for commitment, RUC considers: • Startup Offer (Warmth state taken into consideration) • Minimum Energy Offer • The Energy Offer curve is not used by RUC to select Resources

  6. Shown in COP as available, but there is no three part offer • To create a Three-Part Supply Offer, ERCOT will either: • Use 150% of any approved verifiable Startup and Minimum-Energy Offer costs. • Or, if that isn’t available • Use 150% of the Applicable Resource Generic Startup and Minimum-Energy Offer costs.

  7. Review of Bias subtracted from Load forecast

  8. Review of RUC Commitment Instructions May-July

  9. RUC Data for 7-13 (1 Resource) and 7-18 (14 Resources)

  10. Non-Spin Deployment Criteria • If SHDL – GTBD <= 200 AND Avail_Cap30Min < 500 MW – deploy ALL Non-Spin. (Full deployment of Non-Spin) • If SHDL – GTBD <= 200 AND Avail_Cap30Min < 1000 MW – deploy HALF of Non-Spin. (Partial deployment of Non-Spin) • If Physical Responsive Capability (PRC) < 2500 MW – deploy enough to recover PRC to 2500 (Partial deployment of Non-Spin) • If Physical Responsive Capability (PRC) < 2300 MW – deploy ALL Non-Spin. (Full deployment of Non-Spin) Avail_Cap30Min = SHASL – GTBD – 30MinLoadRamp 30MinLoadRamp=( NextHourLoadForecast – CurrentHourLoadForecast)/2 Physical Responsive capability = S (Min ( Max ( (HSL – TelemMW), 0.0), 0.2*HSL ) for online units + RRS from Load Resources

  11. Questions: Questions

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