Briefing on Exceptional Dispatch Gregory Van Pelt Interim Director, - PowerPoint PPT Presentation

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Briefing on Exceptional Dispatch Gregory Van Pelt Interim Director, Grid Operations Board of Governors Meeting General Session September 10 - 11, 2009 What is exceptional dispatch and why is the ISO relying on it? What? ! Committing

Briefing on Exceptional Dispatch Gregory Van Pelt Interim Director, Grid Operations Board of Governors Meeting General Session September 10 - 11, 2009
What is “exceptional dispatch” and why is the ISO relying on it? What? ! Committing resources and instructing output changes outside of market mechanisms ! Being used more than expected Why? ! Meeting reliability requirements ! Voltage ! Contingencies ! Overcoming model and software limitations Slide 2
The ISO committed to reducing reliance on exceptional dispatches. ! Gained market experience not available in simulation ! Formed Exceptional Dispatch Strike Team ! Analyze process and tools ! Evaluate potential software changes ! Determine process changes ! Assess changes to tariff or business practice manuals ! Emphasize continuous improvement in data quality Results: ! Refined process to reduce exceptional dispatch ! Increased reliance on market Slide 3
We’ve made progress in reducing reliance on exceptional dispatch in the day ahead. 30 20 Frequency 10 0 1-May 8-May 15-May 22-May 29-May 5-Jun 12-Jun 19-Jun 26-Jun 3-Jul 10-Jul 17-Jul 24-Jul 31-Jul 7-Aug 14-Aug 21-Aug 28-Aug Post-DAM Unit Commitment Pre-DAM Unit Commitment Slide 4
The overall volume of exceptional dispatch (MWh) has been significantly reduced. 50000 40000 30000 MWh 20000 10000 0 -10000 1-May 8-May 15-May 22-May 29-May 12-Jun 19-Jun 26-Jun 28-Aug 5-Jun 3-Jul 10-Jul 17-Jul 24-Jul 31-Jul 7-Aug 14-Aug 21-Aug c Min-Load MWh RT Inc MWh RT Dec MWh Slide 5
Exceptional dispatches are a small portion of total load, and a smaller percentage as load increases. 8% 7% 6% 5% Percent 4% 3% 2% 1% 0% 1-May 8-May 15-May 22-May 29-May 5-Jun 12-Jun 19-Jun 26-Jun 3-Jul 10-Jul 17-Jul 24-Jul 31-Jul 7-Aug 14-Aug 21-Aug 28-Aug Percent of Load Monthly Average Slide 6
Reliance on exceptional dispatch will be substantially reduced by the following actions: ! Including more constraints 30 days ! Additional use of RUC 60-90 days ! More complex modeling in IFM BPM change process Stakeholder input ! True-up market to real flows ! Multi-stage generation Up to 1 year ! Multi-day bridging 1 to 2 years ! Transmission upgrades PTO dependent ! Software enhancements Undetermined Exceptional dispatches may always be required for adverse operating conditions or intertie reductions Slide 7

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