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December 29, 2025

California Independent System Operator (CAISO)

FERC OKs CAISO Energy Storage Rules
FERC approved rule changes to improve the ability of energy storage resources to participate in CAISO markets.
Berkshire Affiliates Refund $95K After Market-Based Rate Ruling
Berkshire Hathaway Energy affiliates NV Energy and PacifiCorp refunded nearly $95K to customers after FERC revoked their market-based rate authority.
California Policy Goals to Require Significant Transmission Upgrades
California and CAISO must significantly upgrade its transmission system to meet its target of generating 50% of its electricity from renewable resources.
Skeptics Question CAISO Plan to Lower Bid Floor
Critics of a proposal to lower the CAISO energy market bid floor questioned its efficacy in solving the ISO’s increasing intervals of oversupply.
CAISO Refines Cost Allocation Proposal for Expanded BA
CAISO is refining a proposal for cost allocation of new transmission facilities in an expanded balancing authority that would include areas of the West outside California.
CAISO Plans to Protect Small Utilities from High Network Upgrade Costs
CAISO is developing a plan to shield small transmission owners from upgrade costs for interconnecting generation to serve load outside the TOs’ service areas.
CAISO Charts Course for External Resource Participation in EIM
CAISO last week began work on a plan to extend external resource participation in the western Energy Imbalance Market (EIM).
Federal Judge Upholds Imperial Irrigation District Suit Against CAISO
A federal judge in Southern California declined to dismiss a lawsuit alleging that CAISO unjustly deprived the Imperial Irrigation District  of its full export rights.
Arizona Public Service, Puget Sound Energy Enter EIM Testing Phase
Arizona Public Service and Puget Sound Energy have moved a step closer to linking up with CAISO’s Energy Imbalance Market (EIM).
Fort Churchill Generating Station, NVEnergy
CAISO, ARB to Address Imbalance Market Carbon Leakage
CAISO provided stakeholders an update on its efforts to address Air Resources Board (ARB) concerns that the EIM is not properly accounting for the impact of emissions.

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