Title QSE Capacity Short Calculations Based on an 80% Probability of Exceedance (P80)
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Next Step
Status Approved on 06/14/2016
Effective Dates


Date Gov Body Action Taken Next steps
06/14/2016 BOARD Approved
05/26/2016 TAC Recommended for Approval Board for consideration
05/12/2016 PRS Recommended for Approval TAC for consideration
04/14/2016 PRS Recommended for Approval PRS for Impact Analysis review

Voting Record

Date Gov Body Motion Result
06/14/2016 BOARD To approve NPRR764 as recommended by TAC in the 5/26/16 TAC Report. Passed
05/26/2016 TAC To recommend approval of NPRR764 as recommended by PRS in the 5/12/16 PRS Report Passed
05/12/2016 PRS To endorse and forward to TAC the 4/14/16 PRS Report as revised by PRS and the Impact Analysis for NPRR764 with a recommended priority of 2016 and rank of 1365 Passed
04/14/2016 PRS To recommend approval of NPRR764 as revised by PRS Passed


Status: Approved
Date Posted: Mar 30, 2016
Sponsor: ERCOT
Urgent: No
Sections: 5.7.4 and
Description: This Nodal Protocol Revision Request (NPRR) proposes to base Reliability Unit Commitment (RUC) capacity short calculations on the Wind-Powered Generation Resource Production Potential (WGRPP) for a Wind-powered Generation Resource (WGR) and the PhotoVoltaic Generation Resource Production Potential (PVGRPP) for a PhotoVoltaic Generation Resource (PVGR)–i.e., an 80% probability of exceedance (P80). Under the current Protocols, RUC capacity short calculations are based on the Short Term Wind Power Forecast (STWPF) and the Short-Term PhotoVoltaic Power Forecast (STPPF)—i.e., a 50% probability of exceedance (P50)—pursuant to language introduced by NPRR210, Wind Forecasting Change to P50, Synchronization with PRR841, and NPRR615, PVGR Forecasting. Although NPRR210 directs ERCOT to utilize the WGRPP (P80) in RUC capacity short calculations, there was a missed impact given that the P80 forecast is currently not available in the Market Management System (MMS) but instead resides in the Energy Management System (EMS). Only the STWPF and STPPF, which are used as inputs into the Day-Ahead RUC (DRUC) and Hourly RUC (HRUC), are available in MMS.
Reason: Market efficiencies/enhancements

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