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December 29, 2025

California Independent System Operator (CAISO)

Arizona Public Service, Puget Sound Energy Begin Trading in EIM
Arizona Public Service and Puget Sound Energy began transacting in the Western Energy Imbalance Market (EIM) on Oct. 1, bringing the region’s only real-time market up to five members.
Overheard at the 8th Annual Transmission Summit West
Transmission industry owners, operators, generators, regulators, financiers and other key players from the Western U.S. attended Infocast’s 8th annual Transmission Summit West.
FERC OKs Ramping Product for CAISO, EIM
FERC approved the CAISO plan to for a new market mechanism for itself and the Western EIM designed to integration of variable renewable energy resources.
APS Ordered Again to Revise EIM Dynamic Scheduling Rules
FERC rejected for a second time proposed rules by Arizona Public Service on external resources can use dynamic scheduling to participate in the EIM.
California Department of Emergency Services
UPDATED: CAISO Seeks to Extend Aliso Canyon Gas Rules Through Winter
CAISO's board has approved a proposal to extend Tariff provisions implemented in June in response to the closure of the Aliso Canyon storage facility.
Utility Planners Confront the Complexity of DER
Optimizing distributed energy resources and reducing greenhouse gas emissions cost effectively will require improved forecasting and the elimination of regulatory silos, speakers told Infocast’s California Distributed Energy Summit last week.
California Regulatory Model Fosters — and Hinders — DER Integration
Last week’s Infocast California Distributed Energy Summit was a crash course in the complexity of developing policies on distributed energy resources.
CAISO Monitor Seeks Congestion Revenue Rights Auction Reforms
CAISO paid congestion revenue rights holders $27 million more than it took in from CRR auctions during the first half of the year, according to the ISO’s Department of Market Monitoring.
CAISO Issues Revised Proposal to Expand LSE Definition
CAISO released a final draft proposal to expand the definition of a “load-serving entity” to include organizations purchasing wholesale power to serve their own needs.
Valley Electric Board Approves Sale of 230-kV Network to GridLiance
The Valley Electric Association board of directors approved an agreement to sell the cooperative’s 230-kV transmission network to GridLiance for about $200 million.

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