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December 26, 2025

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.
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Geothermal Picks up in the West but Hurdles Remain, WGA Panelists Say
There is growing excitement about geothermal energy in the Western United States, with billions invested in the industry, but panelists at a Western Governors’ Association workshop said supply chain issues and permitting complexity remain significant challenges.
Amazon
PacifiCorp Contests Amazon Data Center Service Complaint
PacifiCorp filed a partial motion to dismiss an Oregon complaint by Amazon Data Services that alleged the utility has breached agreements to provide electric service to four data centers in the utility’s service territory.
IMCO
Idaho Power Can Retain Market-based Rate Authority, FERC Rules
Idaho Power can continue to sell power at market-based rates after it acquired more than 200 MW in resources 2023 and 2024, FERC ruled.
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CAISO Readies EDAM Tariff Changes as New Market Nears Opening
CAISO is proposing a set of tariff changes for submission to FERC early in 2026 to help ease participants into the ISO’s new Extended Day-Ahead Market.
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UPDATED: NV Energy Filing Reveals Extensive Talks Around EDAM RA Program
Future participants in CAISO’s EDAM have already held extensive talks about developing an alternative to the Western Power Pool’s WRAP for non-CAISO EDAM members, NV Energy confirmed in a filing with Nevada utility regulators.
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BPA Triggers $40M Surcharge Following Low Water Years

The Bonneville Power Administration announced it has triggered a $40 million surcharge to rebuild financial reserves depleted after three years of low water, saying the move could lead to an annual average effective rate increase of 2.2% for most power sales.

CAISO
WEM Board OKs Gas Management Changes to Provide ‘Equitable Access’ to Markets
The Western Energy Markets Governing Body approved a set of revisions to CAISO's gas-fired energy generation resource management program after two years of work with stakeholders.
Western Area Power Administration
WestTEC Targets Early 2026 for Release of 10-year Tx Outlook
The Western Transmission Expansion Coalition plans to publish its 10-year outlook for Western transmission needs in February 2026 and has begun outlining the 20-year plan, according to Energy Strategies, which is developing the report.
CAISO
CAISO Looks to Eliminate Self-schedule Incentives in EDAM Congestion Revenue Design
CAISO continues to work to revise the rules around how congestion revenues will be allocated to participants in the ISO’s Extended Day-Ahead Market, which will be launched in spring 2026.
West-Wide Governance Pathways Initiative
Pathways Takes Key Step Toward Establishing ROWE
The West-Wide Governance Pathways Initiative’s Launch Committee approved the bylaws and incorporation documents for the organization that will govern CAISO’s energy markets.

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