Figure

Supply by fuel against load on an average CAISO day, 2025

On an average 2025 day, solar alone nears total load around midday and the grid runs a surplus that batteries charge against and curtailment absorbs, then batteries discharge into the evening as gas, imports, and hydro cover the rest of the ramp.

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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.

Last updated: 2026-07-03.