Effective Feb. 12, 2022, the California ISO, under its existing tariff authority in section 29.34(l)(5), will be suspending the net-load uncertainty adder from the capacity test within the Western Energy Imbalance Market (WEIM) resource sufficiency evaluation initiative.
Net-load uncertainty was added to the resource sufficiency evaluation’s capacity test’s requirement as part of the market enhancements for 2021 summer readiness. While the addition of uncertainty had stakeholder support, concerns were raised regarding the existing methodology for calculating uncertainty; these concerns remain unresolved. With broad stakeholder support as detailed in the comments received in the WEIM resource sufficiency evaluationenhancements phase 1 initiative, the ISO is moving under its existing authority to suspend this provision from the capacity test. The ISO will look to reconsider net-load uncertainty within the capacity test in a future phase of the resource sufficiency evaluation enhancements
initiative.
