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March 17, 2026

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.
APS
APS to Seek Palo Verde Extension through 2067
Arizona Public Service notified the Nuclear Regulatory Commission it plans to seek operating license renewals for all three units at Palo Verde Generating Station, potentially extending operations through the mid-2060s.
CEC
EV Capacity More Than Battery Storage in California, CEC Finds
California’s historic battery storage boom over the past five years has not kept up with EV capacity growth in the state — and now officials want to send idle electrons back to buildings, homes and the grid through new bidirectional chargers.
© RTO Insider 
EDAM Utilities Moving to Develop RA Program
The push to develop a resource adequacy program serving non-CAISO members of the ISO’s Extended Day-Ahead Market appears to be gathering momentum, with backers saying they aim to produce a draft design for the program in April.
U.S. Army Corps of Engineers
BPA’s Exit from WEIM Necessary for Markets+ Preparation, Staff Says
The Bonneville Power Administration’s planned departure from the Western Energy Imbalance Market has prompted questions about how the agency will handle the yearlong period before it joins SPP’s Markets+.
U.S. Army Corps of Engineers
BPA Releases Draft Decision Solidifying Markets+ Choice
BPA released its draft proposed decision to join SPP’s Markets+, saying that preparations have advanced to a point where it can “move forward with implementation and propose joining Markets+ in October 2028.”
Microsoft
CAISO Developing Large Loads Technical Standards
Although large loads are not new to California or the West, CAISO is formulating technical standards that address their potential boom over the coming years.
BPA
BPA Job Posting Spurs Questions About Search for New Administrator
The Bonneville Power Administration opened the selection process for the agency’s next administrator via an online job posting, prompting questions about the salary range and the level of input Northwestern lawmakers will have.
CAISO DMM
Battery Capacity, Coal Use Rise in WEIM in 2025
CAISO’s Western Energy Imbalance Market saw an increase in battery storage capacity and coal use in 2025 compared with 2024, although the total load across the market did not increase over the year.
Earthjustice
Wash. AG, PIOs Sue to Overturn DOE Order to Keep Centralia Plant Running
Washington’s attorney general and a coalition of public interest organizations filed separate lawsuits to overturn the Department of Energy’s order requiring TransAlta to continue operating the state’s last coal-fired plant beyond its scheduled retirement.
CAISO
EDAM Opening Schedule on Track Despite Lingering Testing Issues
It’s an “all-hands-on-deck” moment for CAISO to open its extended day-ahead market in less than two months, CAISO’s CEO Elliot Mainzer said at a Western Energy Market Board of Governors meeting.

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