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April 29, 2025

Western Energy Imbalance Market (WEIM)

Pattern Energy
SunZia Gets Mixed Decision on Tariff
FERC approved the non-rate terms of SunZia Transmission’s proposed transmission owner tariff but sent the tariff’s non-subscriber usage rate to a settlement process and potential hearing.
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CAISO CEO, Others Point to Reliability Aspect of BPA’s Market Decision
BPA's day-ahead market decision will have “major reliability and affordability impacts” on electricity customers in the Northwest and across the West, CAISO CEO Elliot Mainzer told the ISO’s Board of Governors
Balise42, CC BY-SA-4.0, via Wikimedia Commons
Pathways Inches Closer to Seating RO Board
The West-Wide Governance Pathways Initiative’s Launch Committee said it hopes to seat a permanent board by either next year or 2027 for the regional organization that will govern energy markets in the West.
CAISO
WEIM Q4 Prices Down on Lower Gas Costs, CAISO DMM Finds
CAISO's Department of Market Monitoring found lower natural gas prices helped drive down energy prices in the WEIM in the fourth quarter of 2024.
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Pathways Initiative Receives Praise, Skepticism at Calif. Hearing
California senators heard arguments for and against the West-Wide Governance Pathways Initiative, with some lawmakers voicing concerns about guardrails against market manipulation and what the effort means for the state's autonomy to set its own policies.
Seattle City Light
Seattle City Light, Others Urge BPA to Pause Day-ahead Decision
The Bonneville Power Administration should remain in CAISO’s WEIM and hold off on joining a day-ahead market, Seattle City Light and other Northwest parties urged in a letter sent to BPA CEO John Hairston.
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Feds Pause $1M Pathways Initiative Funding, Group Leader Says
The federal government has put on hold nearly $1 million in funding toward the development of a new independent Western RO to oversee CAISO’s WEIM and EDAM, the West-Wide Governance Pathways Initiative’s Launch Committee said.
CAISO
WEIM Q4 Benefits Exceed $374M
CAISO's Western Energy Imbalance Market provided participants $374.25 million in benefits during the fourth quarter of 2024, down about 4% from the same period a year earlier, according to an ISO report.
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FERC Approves CAISO Energy Storage Bid Cost Recovery Changes
FERC approved CAISO’s tariff revisions related to real-time bid cost recovery rules for energy storage resources.
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BPA Not Planning Any Major Resource Acquisitions
BPA is not planning to acquire any major energy resources but is taking steps to ensure it’s ready in case those predictions should change, staff said during a presentation of the agency’s 2024 Resource Program.

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