Figure

Grid batteries and SCE demand resources: capacity and observed reductions on different bases

On SCE's 4-to-9 PM peak in 2025, CAISO's roughly 15 GW grid-battery fleet put a median 5.4 GW onto the ramp. The other resources are on different bases. One measured SCE home-battery program cohort cut about 7 MW (7.31 MW across 2,491 sites). SCE forecasts about 680 MW of dispatchable demand-response capability for August 2026, and its reductions from separate events sum to about 530 MW without having occurred at the same time. The 1.7 million residential accounts enrolled in the mass behavioral program in 2024 were not called.

Log-scale bar chart pairing capacity with observed output or reductions, on different bases. California batteries in CAISO's balancing area: about 14.6 GW installed in May 2026, beside a median 5.4 GW of CAISO-wide output on the 4-to-9 PM evening peak in 2025. SCE customer batteries across all customer types: about 1.6 GW installed (about 1.3 GW of it residential), with about 7 MW measured for one residential program cohort (7.31 MW across 2,491 sites). SCE demand response: about 680 MW is the utility's forecast of dispatchable capability for August 2026, beside about 530 MW summed from reductions in separate events that did not occur at the same time. Mass behavioral program: about 1.7 million residential accounts enrolled in 2024, not called.

This figure is from the Southern California Edison case study, a primary-source look at how California procured storage and what pointing the same playbook at demand would add.

Cite this figure

Corey Balgeman, "Grid batteries and SCE demand resources: capacity and observed reductions on different bases," Grid Flexibility, 2026. https://gridflexibility.fyi/case-studies/southern-california-edison/figures/sce-resource-enrolled-vs-dispatched

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Last updated: 2026-10-03.