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December 18, 2025

Western Energy Imbalance Market (WEIM)

Western Grid’s Future Debated at CPREC-WIRAB Meeting
The formation of a Western energy market was a contentious topics of discussion at the fall joint meeting of CREPC and WIRAB.
Public Service of New Mexico
PNM Seeks to Join Energy Imbalance Market
Public Service Company of New Mexico (PNM) has applied to join the Energy Imbalance Market by 2021, the EIM Governing Body learned.
CAISO
EIM Benefits Surge to $71.2M in Q2
The Western Energy Imbalance Market saw financial benefits soar to a record $71.2 million in the second quarter, according to a CAISO report.
Fort Churchill Generating Station, NVEnergy
EIM OKs ‘Simple’ GHG Compliance Plan
CAISO EIM officials approved a proposal to prevent market participants outside Ca. from skirting the state’s greenhouse gas (GHG) compliance obligations.
CAISO Board Approves More CRR Auction Changes
CAISO’s Board of Governors approved revisions to the ISO’s congestion revenue rights auction, and the EIM Governing Body approved Travis Kavulla as a member.
Troubled Waters for Powerex in EIM
Powerex is navigating a turbulent relationship with EIM rules the company says undercut the value of its hydro power resources.
EIM Entrance Fees Bump CAISO Revenue
CAISO’s first-quarter (Q1) revenues were $1.2 million more than it had budgeted, primarily because of entrance fees it collected for the EIM.
CAISO
CAISO, PacifiCorp Gain Most EIM Q1 Benefits
CAISO and PacifiCorp reaped the majority of the Western Energy Imbalance Market’s $42.1 million in gross benefits during the first quarter (Q1 2018).
EIM Body Approves Imbalance Conformance Rules
Western Energy Imbalance Market (EIM) leaders on Tuesday approved rule changes that would allow EIM balancing areas to manually adjust load forecasts during market operations to ensure the grid can support system conditions.
CAISO
CAISO Says Changes Will Better Match Forecasting, Demand
CAISO provided details on its plans for major changes to improve the alignment of its day-ahead market with real-time demand.

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