tagged with a transmission profile by T-40; if a fifteen-minute dispatchable resource not, the schedule will be reduced to 0 MW and therefore does not count towards passing the RST. All EIM entities have imports/exports that are used in the determination of the requirement at T-40. These block” “hourly schedules must be tagged by T-20. This is the same for all EIM entities. Hourly blocked intertie schedules are considered in the historical non-delivery of imports/exports which increases the capacity requirement. The ISO will address the under-delivery of intertie resources in the Intertie Deviation Settlement initiative. RST should incorporate imbalance Imbalance conformances (aka biases”) Powerex “load conformances that occur can change by interval and are not systematically in a particular direction. guaranteed to be predictable. The ISO is addressing systematic conforming and making improvements to the conforming process as a result of the Imbalance Conformance Enhancements initiatives. RST should be measured relative to Using base schedules in the RST would result Powerex base schedules instead of the last in inaccurate ramp capability. The balancing interval of the previous hour. test does not ensure base schedules are ramp feasible between hours. For example, a participating resource schedule could be decremented during an hour and there would be no way to determine if it is ramp feasible for that resource to meet a dispatch for the next interval based on the base schedule. RST should be performed with This is not feasible. The RST results occur in Puget Sound granularity. the real-time unit commitment (RTUC) which Energy occurs in 15-minute granularity. Is the CAISO incorrectly receiving No. There are no unique credits towards the Powerex credits towards its flexibility capacity flexibility capacity requirement. requirement? Double-counting of EIM There is no double-counting in the FRST. The Transfer credits is flawed test recognizes that each BAA needs to
tagged with a transmission profile by T-40; if a fifteen-minute dispatchable resource not, the schedule will be reduced to 0 MW and therefore does not count towards passing the RST. All EIM entities have imports/exports that are used in the determination of the requirement at T-40. These “hourly block” schedules must be tagged by T-20. This is the same for all EIM entities. Hourly blocked intertie schedules are considered in the historical non-delivery of imports/exports which increases the capacity requirement. The ISO will address the under-delivery of intertie resources in the Intertie Deviation Settlement initiative. RST should incorporate imbalance conformances that occur systematically in a particular direction. Imbalance conformances (aka “load biases”) can change by interval and are not guaranteed to be predictable. The ISO is addressing systematic conforming and making improvements to the conforming process as a result of the Imbalance Conformance Enhancements initiatives. Powerex RST should be measured relative to base schedules instead of the last interval of the previous hour. Using base schedules in the RST would result in inaccurate ramp capability. The balancing test does not ensure base schedules are ramp feasible between hours. For example, a participating resource schedule could be decremented during an hour and there would be no way to determine if it is ramp feasible for that resource to meet a dispatch for the next interval based on the base schedule. Powerex RST should be performed with granularity. This is not feasible. The RST results occur in the real-time unit commitment (RTUC) which occurs in 15-minute granularity. Puget Sound Energy Is the CAISO incorrectly receiving credits towards its flexibility capacity requirement? Double-counting of EIM Transfer credits is flawed No. There are no unique credits towards the flexibility capacity requirement. There is no double-counting in the FRST. The test recognizes that each BAA needs to Powerex
RevisedWhitePaper-RealTimeResourceSufficiencyTest.docx