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July 9, 2025

Western Energy Imbalance Market (WEIM)

CAISO
Panel Ponders Impacts, Priorities Around Western Market Seams

The formation of two competing day-ahead markets will create seams across the West, but at least one utility representative is more worried about seams resulting from the fracture of CAISO’s real-time Western Energy Imbalance Market.

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Tri-State Tells Colorado PUC Joining SPP RTO in Public Interest
Tri-State asked the Colorado Public Utilities Commission to find it would be in the public interest for the power supplier to join SPP, saying integrating with the RTO would bring significant benefits.
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FERC not in Charge of Modernizing Western Grid, Christie Says

Outgoing FERC Chair Mark Christie and former Colorado Gov. Bill Ritter both emphasized that the West controls the future of the Western interconnection, not Washington.

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Pathways Initiative Seeks $7.1M to Fund RO

The West-Wide Governance Pathways Initiative’s Launch Committee estimates it will cost about $7.1 million to launch the independent regional organization that eventually will oversee energy markets in the West.

The Imperial Irrigation District
Imperial Irrigation District Inks Agreement to Join CAISO Markets
CAISO said the Imperial Irrigation District has signed implementation agreements and will begin participating in the WEIM and EDAM in 2028.
Shutterstock
Turlock Irrigation District to Join EDAM in 2027

California-based Turlock Irrigation District has agreed to join CAISO’s Extended Day-Ahead Market in 2027.

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Debate Lingers After BPA Day-ahead Market Decision
Though BPA removed any uncertainty by selecting SPP’s Markets+ over CAISO’s EDAM, the debate over whether BPA made the right choice likely will heat up as the West confronts a split into two major markets.
Shutterstock
Puget Sound Energy Inks Agreement to Join Markets+

Puget Sound Energy said it is joining Markets+, marking another win for SPP shortly after the Bonneville Power Administration issued its final market policy in favor of the day-ahead market.

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California Lawmakers Seek to Trump-proof Pathways Initiative Bill
New amendments to the proposed Pathways bill would include protections against possible attempts by President Donald Trump to influence California energy markets, such as pushing the state to buy coal-fired generation.
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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