FILE - In this July 1, 2013 photo, gas emissions rises from a coal-burning power plant in Colstrip, Mont. NorthWestern Energy announced Tuesday, Dec. 10, 2019, it was seeking regulatory approval to purchase Puget Sound Energy's 25% share of one of the four units for $1. It is also seeking permission from the Public Service Commission to acquire additional capacity on the Colstrip Power Transmission System for between $2.5 and $3.75 million. That would boost the South Dakota-based utility's ownership interest in the unit to 55% as other utilities are looking to unload their coal-generated power. (AP Photo/Matthew Brown, File)
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