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.
FERC approved an agreement between Southern California Edison and Longroad Development Co. regarding interconnection of a 500-MW battery energy storage project, with one commissioner acknowledging Longroad remains “between a rock and a hard place.”
The group developing a new resource adequacy program for non-CAISO members of the ISO’s Extended Day-Ahead Market is soliciting stakeholder participation to develop a proposal.
CAISO’s Extended Day-Ahead Market is on schedule to launch May 1 with PacifiCorp as its first participant, as the new market goes through a third and final phase of parallel operations testing before starting.
FERC approved a series of revisions related to the design of CAISO’s Extended Day-Ahead Market to support market implementation and avoid disruptions to existing contracts.
FERC fined Terra-Gen nearly $5 million for strategically using its battery storage resources to repeatedly manipulate CAISO’s market over almost two years.
Federal agencies urged the U.S. 9th Circuit Court of Appeals to pause a lower court’s order that would increase spill levels at eight dams on the Columbia and Snake rivers, saying the order risks increasing rates and causing costly blackouts.
CAISO’s draft 2025/26 transmission plan proposes more than $1 billion for an infrastructure project that would power new data centers and other large loads in Silicon Valley.
The Bonneville Power Administration’s draft decision “solidifying” its day-ahead market choice in favor of SPP’s Markets+ has reignited a yearslong debate over the agency’s direction.
The Western Energy Imbalance Market’s Intermountain West region saw its hourly exports increase by an average of 780% — or 680 MW — in Q4 2025 versus the same period a year earlier.
Despite a few large storms in January and February, California snowpack levels are near record lows due to a heat dome that settled over the state in March.
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