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FILE - This April 28, 2010 file photo shows the Colstrip Steam Electric Station, a coal-fired power plant in Colstrip, Mont. The Colstrip plant, a coal plant serving utility customers across the Pacific Northwest, has agreed to shut down two of its four units by 2022 under a settlement announced Tuesday, July 12, 2016, with environmentalists who sued over alleged air pollution violations. (AP Photo/Matt Brown, file)

FILE - This April 28, 2010 file photo shows the Colstrip Steam Electric Station, a coal-fired power plant in Colstrip, Mont. The Colstrip plant, a coal plant serving utility customers across the Pacific Northwest, has agreed to shut down two of its four units by 2022 under a settlement announced Tuesday, July 12, 2016, with environmentalists who sued over alleged air pollution violations. (AP Photo/Matt Brown, file)

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