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flag NorthWestern Energy seeks federal approval to buy coal plant shares from Avista and PSE, expanding its ownership to 55% starting Jan. 1, 2026.

flag NorthWestern Energy is seeking federal approval to increase its ownership of Montana’s Colstrip coal plant to 55% by acquiring 592 megawatts from Avista Corp. and Puget Sound Energy starting Jan. 1, 2026, as both companies exit coal due to state regulations. flag The Avista portion will serve Montana retail customers, while the PSE share will be transferred to a new, unregulated subsidiary for wholesale sales. flag NorthWestern is seeking FERC approval, arguing the move protects ratepayers from potential costs, but state regulators and environmental groups warn it avoids oversight and could shift maintenance expenses to consumers.

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