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.
Judge Puts off Decision in PGE v. FERC
A federal judge asked lawyers to find common ground in a case that pits Pacific Gas & Electric against FERC over billions in power purchase agreements.
FERC Asks RTOs for more Details on Storage Rules
FERC issued deficiency letters to all six jurisdictional RTOs and ISOs over their proposed energy storage rules, pressing for definitions, tariff citations and other details.
SPP Solicits Interest in Western Real-time Market
SPP has made its long-held interest in the West official by “calling on interested utilities and other customers” to help build a real-time market “that will meet the electricity needs of the Western Interconnection.”
UPDATED: PG&E Names New CEO, Board Members
PG&E named the former head of the TVA as its CEO and assembled a “refreshed” board of 13 directors including people with FERC and EIM experience.
SMUD Goes Live in Western EIM
The Western Energy Imbalance Market continued expanding as the Sacramento Municipal Utility District became the first publicly-owned utility to begin participating in CAISO’s real-time electricity market for the West.
FERC Rejects CAISO RA Incentive Change
FERC rejected a CAISO plan to change incentive rules under its resource adequacy mechanism for wind and solar generation.
PNM’s Bid to Join Western EIM Gets Approved in Part
The New Mexico PRC granted two approvals PNM requested to join CAISO’s Western Energy Imbalance Market, but denied one concession the utility deemed key.
CAISO Board OKs Market Power Mitigation Remedy
CAISO’s Board unanimously approved a proposal to address concerns that the ISO’s market power mitigation rules disincentivize participation in the EIM.
FERC OKs Trans Bay Cable Sale to NextEra
Despite protests from a number of cities, FERC approved the sale of the Trans Bay Cable, a 400-MW line that runs under San Francisco Bay, to NextEra.
Silicon Valley Tackles Wildfire Prevention
The inaugural Wildfire Technology Innovation Summit held at California State University, Sacramento, attracted about 700 attendees.

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