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March 18, 2026

CAISO/WEIM

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.
UPDATED: Cal Fire Pins Deadly Camp Fire on PGE
Pacific Gas and Electric transmission and distribution lines caused the deadliest and most destructive fire in California history, state officials said.
Turlock Irrigation District to Join Western EIM
CAISO said that Turlock Irrigation District, California’s oldest irrigation district, signed an agreement to join the Energy Imbalance Market in April 2021.
Abundance of Summer Capacity — Except in Texas
ERCOT’s low reserve margin sticks out when compared to those of most other regions in the U.S., where their reserves are well above their reference levels.
CAISO Predicts Plentiful Hydro, Gas Constraints
CAISO’s summer load forecast predicts an abundance of hydroelectric power but sees constraints on its natural gas supplies.
NERC Standards News Briefs: May 8-9, 2019
The NERC Board of Trustees approved a supply chain report and a new standard on third-party transient electronic devices while eliminating 84 requirements.
PGE Probed by Plaintiffs’ Lawyers, SEC
PG&E Corp. came under criticism from a federal judge, who ordered its new CEO and board members to view the scene of the devastating Camp Fire.
Tucson Electric Power Signs up for Western EIM
The Western Energy Imbalance Market chalked up another future member after Tucson Electric Power signed an agreement saying it will join in April 2022.
FERC Rejects Oakland Appeal v. PGE
FERC denied a request for rehearing by the city of Oakland against Pacific Gas and Electric for charging retail instead of wholesale rates.
WECC Summit Explores Rapid Change in the West
Speakers at this year’s Western Reliability Summit discussed the growth of solar, the challenges of cybersecurity and the dangers of climate change.
FERC Denies PGE Rehearing over Contracts Dispute
FERC rejected PG&E’s request to rehear its ruling that it shares authority with a federal bankruptcy judge over any PPAs the utility might seek to modify.

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