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December 17, 2025

Western Energy Imbalance Market (WEIM)

Utah Office of Energy Development and S&P Global Market Intelligence
FERC Commissioners Opine on Western RTO
FERC commissioners told an audience of Western stakeholders and regulators that they back the formation of a Western RTO; California can't go it alone.
Overheard at EBA’s 2021 Mid-Year Forum
The first day of EBA's Mid-Year Forum included discussions on FERC's inquiry into transmission cost allocation and organized market developments in the West.
© RTO Insider LLC
Talk of Western RTO Intensifies
Increased discussion of a Western RTO is being driven by clean-energy mandates and state laws requiring transmission owners to join an organized market.
CAISO
CAISO Promotes EDAM Effort in Forum
CAISO paused its WEIM EDAM effort last year but renewed it Wednesday amid a growing push for greater Western regionalization and market coordination.
© RTO Insider LLC
Western Utilities to Explore Market Options
Major Western utilities plan to discuss coordinated market services and the possible formation of an organized market in an exploratory group.
© RTO Insider LLC
Bonneville Commits to Joining Western EIM
The Western Energy Imbalance Market is poised to make its largest expansion ever next spring with the inclusion of the Bonneville Power Administration.
CAISO
WAPA Desert Southwest Region to Join Western EIM
WAPA's Desert Southwest Region said it plans to join CAISO's Western Energy Imbalance Market, further splitting the PMA's regions between the ISO and SPP.
CAISO
Western EIM Approves ‘Sub-entity’ Participation
The WEIM approved participation by utilities within an entity's balancing authority area — a move intended to convince Xcel Energy Colorado to join the market.
© RTO Insider LLC
CAISO Agrees to Share More Power with EIM
CAISO's Board of Governors and the Western Energy Imbalance Market Governing Body agreed to a new split of authority in which FERC could settle disputes.
© RTO Insider LLC
Oregon Study to Examine Benefits, Risks of RTO Participation
Oregon’s Department of Energy is seeking input from power industry stakeholders to help produce a study that could convince lawmakers to obligate the state’s utilities to participate in an RTO.

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