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December 26, 2025

California Independent System Operator (CAISO)

Federal Officials Side with Utilities on Tree-Clearing Bills
The Trump administration sided with utility witnesses on legislation to streamline approvals for managing vegetation near power lines on federal land.
© RTO Insider
CAISO Regionalization, 100% Clean Energy Bills Fizzle
Legislature ended its 2017 session, drawing criticism for its pursuit of CAISO regionalization and for letting a 100% clean energy bill die in committee.
CAISO Finalizes Risk-of-Retirement Program Changes
CAISO sought to address stakeholder concerns in its final proposal for preventing the retirement of power plants that may be needed for system reliability.
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CAISO Drops Proposed EIM Changes
CAISO is dropping a handful of proposed enhancements to the EIM less than two months before the board is slated to review a broader package.
CAISO Regionalization, 100% Clean Energy Bills Stall
California legislation that would regionalize CAISO and mandate 100% zero-carbon retail electricity sales statewide by 2045 will not pass this year.
UPDATE: Last-minute Bill Boosts CAISO Regionalization Effort
Last-minute legislation that would transform CAISO into an RTO has stalled in the California State Senate.
CAISO
Monitor Critical of CAISO Commitment Cost Mitigation Plan
CAISO’s Department of Market Monitoring amplified its opposition to a fundamental aspect of the ISO’s plan for commitment cost mitigation.
FERC Approves Powerex EIM Agreement
FERC approved CAISO’s agreement for integrating Canadian power marketer Powerex into the EIM.
EIM Body Approves Generator Loss Modeling Plan
The EIM Governing Body approved a CAISO proposal allowing market participants to take part in a program that models generator outages.
© RTO Insider
EIM Participants Seek Resource Test Tweaks
EIM market participants voiced concerns about fluctuating load forecasts that make it harder to pass resource sufficiency tests.

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