On May 20, 2022, the California Public Utilities Commission (CPUC or Commission) issued a proposed decision (PD) that would, among other things, adopt Southern California Edison’s (SCE) 24-hour-slice proposal as the new resource adequacy (RA) framework applicable to load-serving entities (LSEs) under the CPUC’s jurisdiction. Generally, the proposal would require each LSE to show that it has enough capacity to meet its specific gross-load profile, including a planning-reserve margin, or PRM, for all 24 hours for the “worst day” of each month. The “worst day” would be defined as the day of the month that has the highest coincident-peak-load forecast. This new RA framework would likely be implemented in 2025, with 2024 serving as a “test year” for the new framework.
The Commission initially began examining potential changes to its RA framework due to significant and ongoing changes in California’s generation-resource mix, with the increasing reliance on variable resources such as solar and wind, and use-limited resources, such as energy storage and demand response, as well as the retirement of older natural gas generation. The Commission solicited proposals for a new RA framework starting in 2020, and in 2021 it tentatively adopted Pacific Gas and Electric’s (PG&E) slice-of-day proposal in decision 21-07-014. The Commission ordered a series of workshops to further develop the proposal, culminating in a workshop report submitted March 1, 2022. During the workshops, two alternate proposals were developed: SCE’s 24-hour-slice proposal, and a two-slice proposal developed by Gridwell Consulting. The parties generally favored one of the two alternate proposals, rather than the PG&E slice-of-day proposal. The selection of SCE’s 24-hour-slice proposal will set the direction for further development of the new RA framework.
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