CAISO/WEIM
CAISO Board of GovernorsCalifornia Agencies & LegislatureCalifornia Air Resources Board (CARB)California Energy Commission (CEC)California LegislatureCalifornia Public Utilities Commission (CPUC)EDAMOther CAISO CommitteesWestern Energy Imbalance Market (WEIM)WEIM Governing Body
The California Independent System Operator serves about 80% of California's electricity demand, including the service areas of the state's three investor-owned utilities. It also operates the Western Energy Imbalance Market, an interstate real-time market covering territory that accounts for 80% of the load in the Western Interconnection.
CAISO’s Western Energy Imbalance Market surpassed $8 billion in cumulative economic benefits since its 2014 launch after providing participants with $415.65 million in gross benefits in the fourth quarter of 2025, according to an ISO report.
The Regional Organization of Western Energy selected Western Freedom Executive Director Kathleen Staks as its interim president, while regulatory attorney Lisa Tormoen Hickey will assume the role of interim secretary.
Elliot Mainzer said working at BPA taught him two critical lessons that he's applied at CAISO: the importance of "robust stakeholder engagement" and "collaborative working relationships."
California continues to go all in on data center development, with Pacific Gas and Electric playing its role in the last quarter of 2025 by pushing gigawatts of projects through the investor-owned utility’s design and approval process.
California’s reliance on a large amount of imported electricity and fossil fuels is a potential weakness in the state’s energy security portfolio, a California Energy Commission staff report finds.
More than 60 GW of generation is a step closer to connecting to BPA's transmission system, following the release of Phase 1 of an interconnection cluster study.
Offshore wind experts urged the California Public Utilities Commission to reconsider a forecasted 6-year delay to the Golden State’s offshore wind project in Humboldt County.
The West must build or upgrade 12,600 miles of transmission at a cost of about $60 billion to meet the region’s forecast 30% increase in peak demand and other needs by 2035, according to the Western Transmission Expansion Coalition's 10-year outlook.
CAISO wants to ensure grid reliability when artificial intelligence data centers “pulsate.”
CAISO leaders staged a virtual “town hall” to stress the importance of a smooth rollout to the ISO’s Extended Day-Ahead Market in May and promise to address market seams issues.
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