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.

It’s an “all-hands-on-deck” moment for CAISO to open its extended day-ahead market in less than two months, CAISO’s CEO Elliot Mainzer said at a Western Energy Market Board of Governors meeting.

CAISO is proposing a set of tariff changes for submission to FERC early in 2026 to help ease participants into the ISO’s new Extended Day-Ahead Market.