March 10, 2025

Western Energy Imbalance Market (WEIM)

Gov. Steve Sisolak via Twitter
Nevada Gov. Sisolak Appoints Regional Transmission Task Force
Nevada Gov. Steve Sisolak announced the membership of a panel that will advise the governor and legislature on potentially bringing the state into an RTO.
Shutterstock
FERC Accepts CAISO Hybrid Rules
FERC accepted a second round of changes from CAISO's stakeholder initiative on hybrid resources, including a contested exemption for renewables plus storage.
CAISO
CAISO Reconvenes EDAM Stakeholder Meetings
CAISO restarted the stakeholder process to expand its Western Energy Imbalance Market from a real-time to a day-ahead interstate market after a 14-month break.
Robert Ashworth, CC BY-SA-2.0, via Wikimedia
Siting Council Endorses Central Wash. Solar Farm
An 80-MW solar farm proposed for central Washington is moving closer to state approval.
CAISO
Western EIM Sees Record Benefits in Q3
The Western Energy Imbalance Market racked up $301 million in benefits in the third quarter of 2021, surpassing or approaching yearly totals in 2019 and 2020.
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.

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