Figure

Standalone storage versus demand response on California's resource-adequacy books, 2019 to 2025

On the month-ahead September showing, standalone grid batteries grew from about 0.2% of California's resource adequacy in 2019 (89 MW) to about 17.5% in 2025 (about 10.4 GW), passing the entire demand-response fleet in 2022, while all demand response together held between about 1.4 and 1.85 GW. The two series are counted on different bases.

Line and band chart of California resource-adequacy megawatts, 2019 to 2025. Standalone grid-battery RA rises from 89 MW (0.2%) in 2019 to about 10,411 MW (17.5%) in 2025, crossing the demand-response level in 2022. All demand-response RA holds in a band between about 1,416 and 1,847 MW.

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, "Standalone storage versus demand response on California's resource-adequacy books, 2019-2025," Grid Flexibility, 2026. https://gridflexibility.fyi/case-studies/southern-california-edison/figures/ra-currency-ramp

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Last updated: 2026-07-03.