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December 5, 2025

California Independent System Operator (CAISO)

Office of Gov. Gavin Newsom
Newsom Renews Call for Passage of Pathways Bill

California Gov. Gavin Newsom renewed his call for lawmakers to pass a bill to authorize CAISO to relinquish governance of its electricity markets and allow it and the state’s utilities to participate in a new “regional organization” designed to oversee a West-wide market.

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FERC OKs Imperial Irrigation District’s WEIM Agreement

FERC approved CAISO's Western Energy Imbalance Market implementation agreement with Imperial Irrigation District.

CAISO
EDAM Implementation Team Reveals New Intertie Scheduling Approach

CAISO staff showed how the grid operator plans to implement certain parts of its Extended Day-Ahead Market, with stakeholders asking for more time to comment on what they said crossed into potential policy revisions.

BLM California
CAISO Monitor Sees ‘Gaming’ Potential in Battery Storage Bid Cost Recovery

CAISO’s Market Monitor is concerned about potential gaming practices and inefficient bidding behavior in the ISO’s bid cost recovery  process for battery storage resources.

DOE
BPA Supported by Trade Orgs in Suit over Day-ahead Market Decision
Trade organizations for utilities and large energy consumers seek to intervene in the lawsuit filed in the 9th Circuit Court of Appeals challenging the Bonneville Power Administration’s decision to join SPP’s Markets+ instead of CAISO’s EDAM.
CAISO
Calif. Energy Officials Ponder Interconnection Timelines, Load Uncertainty
California energy officials are recognizing the need to work together to prioritize a long list of transmission and distribution interconnection projects as the state’s load growth accelerates due to expected data center development.
Brattle Group
Home Batteries Provide 535 MW to CAISO Grid on VPP Test Day
An aggregation of more than 100,000 residential batteries provided an average 535 MW of support to California’s electricity grid during a test to prepare for the hot summer period ahead.
CAISO
WEIM Q2 Benefits Exceed $420M, as Total Tops $7.4B
CAISO’s Western Energy Imbalance Market provided participants with $422.44 million in economic benefits during the second quarter of 2025, up 15% compared with the same period year earlier despite no change in membership. 
CAISO
FERC Affirms Use of RTO Adder for CAISO Tx Developer
FERC affirmed the ability of an independent transmission developer to include an RTO adder in its CAISO formula rate, rebuffing a request by the California Public Utilities Commission to reject the company’s use of the incentive.
West-Wide Governance Pathways Initiative
Pathways Initiative Clarifies Near-term Division of Labor with CAISO
The West-Wide Governance Pathways Initiative will run its stakeholder processes separately from CAISO’s until the effort's regional organization is formally launched in 2028, even in areas of overlapping interest.

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