Search
March 21, 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.
Study to Weigh Aliso Canyon Shutdown
California regulators advanced on a plan to study the potential for eliminating the Aliso Canyon natural gas storage facility.
CAISO Seeks to Drop Outdated Planning Role
CAISO last week proposed to eliminate from its Tariff an annual state transmission concept plan that it says is obsolete due to FERC Order 1000.
CAISO Proposal Would Permit ‘Economic’ Outages
A CAISO proposal released would allow power producers to temporarily suspend the operations of unprofitable generators not needed for system reliability.
Western Utilities Bought 3X Planned Wind, Study Says
A Department of Energy study found that Western U.S. utilities procured three times more wind capacity than planned in 2003-2014.
Consolidated EIM Proposal Effort Gets Underway
CAISO has begun seeking comment from participants in the Western Energy Imbalance Market on three modifications it’s proposing to make to the market.
UPDATE: California Heat Wave Prompts CAISO Flex Alert
CAISO on Monday called on consumers to voluntarily conserve energy this week as scorching heat drove up electricity usage and caused outages.
WECC Generation, Transmission Loss Events Spike
Electric system disturbances from the loss of generation or transmission in the Western Interconnection increased by 50% between 2015 and 2016.
CAISO Proposes Consolidated EIM Changes
CAISO is kicking off an initiative that will consolidate proposed changes to the Western Energy Imbalance Market (EIM).
CAISO Finalizes Rules for DR, Distributed Generation
CAISO finalized a set of updates to its demand response and distributed generation policies, saying there is strong stakeholder support for the new rules.
UPDATE: Trump Fights Congress, History with Tx Sale Bid
Some members of Congress have joined power utilities in opposing Trump’s proposal to sell assets of the federal power marketing administrations.

Want more? Advanced Search