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March 10, 2026

Western Energy Imbalance Market (WEIM)

WECC
26 Western Entities Signal Continued Support for Markets+
More than two dozen Western electricity sector entities sent a letter to SPP expressing support for the continued development of the RTO’s Markets+, which is competing for participants with CAISO’s Extended Day-Ahead Market. 
West-Wide Governance Pathways Initiative
Western RTO Group Floats Independence Plan for EDAM, WEIM
Backers of an initiative to create an independent Western RTO that builds on CAISO’s markets have floated a plan to untangle the snag that’s hung up past efforts to “regionalize” the ISO: a lack of independent governance.
© RTO Insider LLC
BPA Staff Recommends Markets+ over EDAM
The Bonneville Power Administration released a much anticipated staff report that tentatively recommends the agency choose SPP’s Markets+ over CAISO’s Extended Day-Ahead Market.
EIA
EIA: Western Hydro Output Hit 22-year Low Last Year
Despite record winter precipitation in California, hydroelectric generation in the Western U.S. fell to a 22-year low in the 2022/23 water year, largely due to drought conditions in Washington and Oregon.
CAISO
WEIM Expert Calls for Fast-start Pricing to Address ‘Anomalies’

Fast-start pricing could fix certain “price anomalies” in CAISO markets more effectively than existing mechanisms for compensating ramping resources, the WEIM Governing Body’s market expert told the group.

© RTO Insider LLC
CAISO’s EDAM Scores Key Wins in Contested Northwest
CAISO scored simultaneous victories in heavily contested territory after Portland General Electric and Idaho Power both signaled their intent to join the Extended Day-Ahead Market.
CAISO
CAISO, Stakeholders Consider 2 GHG Mechanisms for EDAM

CAISO stakeholders and staff could soon be weighing two options for enabling the EDAM to track GHGs in a way that accommodates the patchwork of different carbon reduction programs across Western states.

West-Wide Governance Pathways Initiative
Pathways Initiative Discloses Funders, Reiterates Goals
The West-Wide Governance Pathways Initiative has secured commitments of financial support from 24 utilities and other electricity-sector organizations and expects that list to grow.
CAISO
DMM: CAISO Transfer Limitations During Q3 Heat Waves Led to Price Disparities
CAISO's Department of Market Monitoring found that limits on WEIM imports last year led to increased transmission congestion in the ISO's markets.
Powerex
Powerex Report Expands NW Cold Snap Debate

A new report from electricity marketer Powerex adds to the expanding debate around what transpired on the Western grid during a January cold snap that saw the Northwest forced to import large volumes of power.


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