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February 17, 2026

Western Energy Imbalance Market (WEIM)

Turlock Irrigation District to Join Western EIM
CAISO said that Turlock Irrigation District, California’s oldest irrigation district, signed an agreement to join the Energy Imbalance Market in April 2021.
Tucson Electric Power Signs up for Western EIM
The Western Energy Imbalance Market chalked up another future member after Tucson Electric Power signed an agreement saying it will join in April 2022.
Cold Forces NW to Dip More Deeply into EIM as Avista Joins
Pacific Northwest members reaped an unusually large chunk of the Western EIM's benefits in the first quarter, leaning on it to keep up with demand.
SPP Solicits Interest in Western Real-time Market
SPP has made its long-held interest in the West official by “calling on interested utilities and other customers” to help build a real-time market “that will meet the electricity needs of the Western Interconnection.”
UPDATED: PG&E Names New CEO, Board Members
PG&E named the former head of the TVA as its CEO and assembled a “refreshed” board of 13 directors including people with FERC and EIM experience.
PNM’s Bid to Join Western EIM Gets Approved in Part
The New Mexico PRC granted two approvals PNM requested to join CAISO’s Western Energy Imbalance Market, but denied one concession the utility deemed key.
State Regulators to Re-examine PNM’s EIM Membership
New Mexico’s PUC vacated an order that had paved the way for the PSC of New Mexico to join CAISO’s Western Energy Imbalance Market by the spring of 2021.
FERC OKs Salt River Project Agreement to Join EIM
FERC approved an agreement between CAISO and the Salt River Project that establishes the rules governing the utility’s participation in the Western EIM.
Western EIM Looks to Expand its Authority
The Western Energy Imbalance Market (EIM) Governing Body heard proposals regarding its existing real-time market and an expanded day-ahead market.
CAISO
RC Transition, California Wildfires Will Occupy 2019
CAISO will tackle its new role as reliability coordinator in 2019, and California lawmakers will struggle with preventing wildfires sparked by power lines.

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