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.
PacifiCorp is on schedule to enter CAISO’s Extended Day-Ahead Market on May 1, with the utility now in its final phase of market settlements and simulations testing.
Hydropower generation in the Northwest and Rockies is expected to increase 17% from 2025 levels despite snow drought conditions, the U.S. Energy Information Administration said.
The Bonneville Power Administration said it continues to face steep energy deficits under “firm” water conditions over the next 10 years — but the outlook is slightly better than what the agency foresaw a year ago.
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.
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