NPRR409  Outage Planning Criteria Clarifications and Enhancements to Narrow Gap Between Real-Time Operations and Outage Planning

This NPRR adds a new definition of Outage Planning Contingencies to be consistent with NOGRR078 and PGRR011. This NPRR also revises factors used by ERCOT to evaluate requests for Generation and Transmission Outages received from Market Participants to allow for 90th percentile variation of weather driven Load, generation availability, and transmission line ratings of dynamically rated lines. This NPRR ensures that Outage planning studies do not double count generation capacity as being available simultaneously for both congestion management and Ancillary Services including Responsive Reserve (RRS), Regulation Up (Reg-Up), and Non-Spinning Reserve (Non-Spin), unless ERCOT Operations has processes in place to allow for location specific deployment of the Ancillary Service reserves for congestion management purposes. Finally, this NPRR ensures that, if in Real-Time operations ERCOT determines that a generic constraint definition and associated transfer limit(s) is required for secure operation of the ERCOT System, then this same generic constraint shall be similarly modeled in Outage planning studies.