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CPUC staff proposes two reliability procurement paths: marginal ELCC framework and a new‑resources-only approach
Summary
CPUC staff presented two alternative reliability procurement designs for the RCPP: a marginal ELCC–based approach covering new and existing resources with a 2.5% buffer and IOU central procurement reserve, and a new‑resources‑only option tied to an expanded multiyear RA program.
California Public Utilities Commission staff presented two alternative reliability procurement designs at an IRP workshop, centered on marginal ELCC accreditation and a complementary ‘‘slice‑of‑day’’ alignment with the RA program.
“A marginal ELCC methodology is a way to put all resources on a level playing field,” consultant Aaron Burdick of E3 said. “No resource can provide perfect availability all of the time, and the ELCC methodology is a way to put all resources on a level playing field, measured relative to a perfect capacity generator, that accounts for all of their potential availability limitations.”
Staff described a four‑step ‘‘critical periods’’ framework: (1) use SERVM/Resolve to determine the system reliability need aligned to a 0.1‑days‑per‑year LOLE standard; (2) calculate marginal ELCCs for each resource type from a system portfolio; (3) sum marginal ELCC megawatts to establish the reliability procurement need; and (4) allocate that need to each LSE based on the LSE’s…
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