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December 14, 2025

Western Energy Imbalance Market (WEIM)

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In Contest for the West, Markets+ Gathers Momentum — and Skeptics
While some stakeholders are ‘charmed’ by SPP’s market initiative effort, others urge need for deeper tie to CAISO.
WEIM
WEIM Tops $4B in Benefits Months After Hitting $3B
The Western Energy Imbalance Market topped $4 billion in cumulative benefits in the second quarter of 2023, just six months after it topped the $3 billion mark.
BPA
BPA Keeps Rates Flat, Plans $2B in Grid Upgrades

The Bonneville Power Administration said it would keep its power and transmission rates flat for the next two years, even as it pursues a $2 billion grid modernization effort.

WECC
Proposed New Western RTO Discussed at CREPC
Utility regulators from Oregon and California discussed their proposal for a new independent RTO covering the entire West for the first time publicly.
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WEIM Withdraws Change to Base Schedule Deadline

CAISO’s Western Energy Imbalance Market took the unusual step of rescinding a rule change that it never actually implemented.

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Regulators Propose New Independent Western RTO
The competition for organized markets in the West grew Friday as the Bonneville Power Administration launched a process to choose between day-ahead markets proposed by CAISO and SPP and regulators from five Western states urged the establishment of a new, independent RTO covering the entire West.
CAISO
Batteries Multiply in CAISO, Soak up Solar
The more than 5,000 MW of batteries connected to the CAISO grid are playing in increasing role in maintaining reliability, a report from the ISO's Market Monitor shows.
PacifiCorp
PacifiCorp Says It Can Meet Oregon GHG Targets
PacifiCorp will be able to meet Oregon’s ambitious greenhouse gas emissions reduction targets for electric utilities but “it will not be without challenges,” a company official said.
CAISO
Western EIM Governing Body Gets New Member, Chair
The Western Energy Imbalance Market Governing Body appointed new member Rebecca Wagner and elected a new chair and vice chair from among its members.
Thomas Built Buses
Nevada Lawmakers Pass Bills on Utility Market Risk, Clean Trucks
Legislators ended the session by passing bills related to IRPs for electric and gas utilities and a bill creating a zero-emission truck incentive program.

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