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December 18, 2025

Western Energy Imbalance Service (WEIS)

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Western Markets Exploratory Group Shares Views
The Western Markets Exploratory Group made a rare public presentation at CREPC-WIRAB of its behind-the-scenes work evaluating market options for the West.
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FERC Commissioners Opine on Western RTO
Commissioners Mark Christie and James Danly addressed the pros and cons of the West’s pursuit of greater market coordination at the fall CREPC-WIRAB meeting.
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New Study: Increased Savings from SPP RTO West Expansion
Western utilities interested in SPP’s RTO West offering released a study showing the grid operator’s expansion could produce huge annual savings.
SPP
SPP Board of Directors/Members Committee Briefs: July 26, 2022

SPP’s Board of Directors approved stakeholders’ recommendation to issue a notification to construct a 345-kV double-circuit transmission project in New Mexico.

CAISO
Western Utilities to Support SPP Market Development
A group of Western utilities plans to help SPP develop its Markets+ program in the West and to examine the benefits of joining it or CAISO's day-ahead market.
SPP
SPP to Phase Out WEIS as New Market Offerings Expand
SPP said it plans to close its Western Energy Imbalance Service, with members joining either its proposed Markets+ program or its Western RTO.
CAISO
Changing Grid, State Policies Favor Western RTO
CAISO, SPP and the Western Power Pool are all maneuvering to organize the Western electricity sector, and conditions finally seem ripe for change.
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Gov. Polis Speaks on Colorado’s Carbon-free Future
Gov. Jared Polis joined stakeholders at COSSA's Solar Power and Energy Storage Mountain West Conference to discuss the state’s future renewable energy economy.
SPP
SPP Aspires to Increase its Western Footprint in 2022
SPP's new five-year strategic plan includes increasing its footprint in the Western Interconnection.
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Colorado PUC: State Could Save up to $230M in Wholesale Market
A Colorado PUC report found that joining an organized wholesale electricity market could save the state’s utilities $50 million to $230 million annually.

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