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.

Two Arizona utilities received approval to convert coal-fired power plants to run on natural gas, projects they say will enhance grid reliability, reduce emissions and preserve jobs.

Washington’s attorney general and a coalition of public interest organizations filed separate lawsuits to overturn the Department of Energy’s order requiring TransAlta to continue operating the state’s last coal-fired plant beyond its scheduled retirement.

For the first time in years, California’s grip on Western market design is genuinely at risk, writes Nick Myers of the Arizona Corporation Commission.

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.

Conversations remained cordial despite the ongoing competition between CAISO and SPP in the west as the RTOs’ top executives took the stage at Yes Energy’s annual EMPOWER conference.

Black Hills Energy and PowerWatch are to join CAISO’s Western Energy Imbalance Market, extending the market’s geographical reach into South Dakota, the ISO announced.

The California Public Utilities Commission ordered 6 GW of new capacity to meet forecast data center and electric vehicle loads — among other new demand — in the state.

A federal judge in Oregon ordered increased spill levels at eight dams on the Columbia and Snake rivers in order to protect endangered salmon species, rejecting claims that doing so would impede power generation.

CAISO released a set of guiding principles for upcoming discussions about seams between the ISO, SPP and other entities as the Extended Day-Ahead Market nears its opening in May.