Phase 1 of this initiative examines the design and implementation of the current Western Energy Imbalance Market (WEIM) resource sufficiency evaluation (RSE). This initiative will review the balancing, capacity, and flexible ramping tests to determine if any enhancements are needed to ensure the test components achieve their stated objective. In addition, this initiative will clarify what constitutes leaning, as well as determine appropriate consequences for a failure of the RSE.
Phase 1B of this initiative enhances the accuracy and equitable application of the WEIM resource sufficiency evaluation (RSE). The phase 1B enhancements aim to resolve outstanding concerns regarding the accuracy of the RSE that were raised by stakeholders in the phase 1 initiative. As part of the phase 1B initiative, the ISO will analyze the impact of load conformance on WEIM transfers, the interplay of WEIM transfers with hourly block exports, and the performance of the methodology to estimate uncertainty requirements.
Proposal Development | Decision | Implementation | Completed/Closed |
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Dec 12, 2022 Revised draft tariff language posted
Nov 07, 2022 Revised final proposal posted |
Dec 14, 2022 Joint WEIM Governing Body and Board of Governors approval
Sep 14, 2022 FERC Order accepting compliance filing (ER22-1278) Jun 07, 2022 Compliance filing (ER22-1278) May 27, 2022 FERC approval (ER22-1278) Mar 11, 2022 Tariff amendment filing (ER22-1278) Feb 09, 2022 ISO Board of Governors approval - phase 1 Feb 02, 2022 Market Surveillance Committee opinion adopted - phase 1 |
Jun 01, 2022 Implementation - phase 1
Implementation milestones
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