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CPUC INA applies ELCC accreditation, sets ~15% perfect-capacity PRM target and retains 4 GW unspecified import cap with ramping
Summary
CPUC staff will use an ELCC-for-all accreditation approach, with ServM-derived ELCC surfaces for solar and storage, and reported a 2035 perfect-capacity planning reserve margin near 14–16%; staff will keep a 4 GW unspecified-import limit but implement a ramped hourly profile to avoid an abrupt import cliff.
CPUC staff explained revisions to reliability and transmission inputs in the draft INA: method updates for ELCC accreditation, a proposed planning-reserve margin target, transmission deliverability clusters and interconnection headroom limits, and an approach to modeling imports and out-of‑state candidate deliveries.
On reliability accreditation and PRM: Erin and colleagues presented an “ELCC for all” approach that credits every resource by its effective load-carrying capability (ELCC) in Resolve. Using ServM loss-of-load modeling with a perfect-capacity construct, staff reported that the total perfect-capacity planning reserve margin needed to meet the CPUC’s 1-in-10 standard in 2035 is “roughly a 15% annual reserve margin.” Staff said they performed…
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