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Proposed Change to Methodology regarding Regulation Service

Proposed Change to Methodology regarding Regulation Service. ROS 5/10/2007. Current Methodology. Divides the Regulation Up and Down requirements into blocks of Hours

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Proposed Change to Methodology regarding Regulation Service

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  1. Proposed Change to Methodology regarding Regulation Service ROS 5/10/2007

  2. Current Methodology • Divides the Regulation Up and Down requirements into blocks of Hours • Calculates the average and standard deviation of deployed Regulation Up and Down by hourin the previous month and same month of the previous year. • Targets an exhaustion rate of 1.2% or 35 settlement intervals/month

  3. Proposed Methodology • Removes the requirement to Block Hours for procurement of Regulation Up and Down • Calculates the 98.8 percentile of deployed Regulation Up and Down in the previous month and same month of the previous year by hour • Targets an exhaustion rate of 1.2% or 35 intervals/month • Adds a back-cast requirement that allows ERCOT to adjust when the exhaustion rate exceeds 1.2%.

  4. Historical Regulation Procurement

  5. SUMMARY • A 98.8th percentile method using the same historical data with no grouping among hours appears to produce results that are more efficient and closer to the reliability objectives • Utilizing the back-cast in a feedback loop will allow ERCOT to adjust if the exhaustion rate exceeds 1.2%.

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