Battery Capacity, Coal Use Rise in WEIM in 2025

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Change in average hourly generation by fuel type in 2025 compared to 2024 | CAISO DMM

Mar 5, 2026 | David Krause

CAISO’s Western Energy Imbalance Market saw an increase in battery storage capacity and coal use in 2025 compared with 2024, although the total load across the market did not increase over the year.

Battery Electric Storage CAISO Board of Governors Coal Transmission Operations WEIM Governing Body

Keywordsbattery storage CAISO Department of Market Monitoring (DMM)California Independent System Operator (CAISO)coal WEM Governing Body Western Energy Imbalance Market (WEIM)

David Krause

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