MURPHY, Circuit Judge.
Sierra Club brought this Clean Air Act (CAA) citizen suit against Otter Tail Power Company, MDU Resources Group, and Northwestern Energy, who own and operate the Big Stone Generating Station, a coal fired power plant near the border between South Dakota and Minnesota. Sierra Club alleged that Otter Tail violated the CAA by failing to obtain permits for a series of modifications to the plant and by exceeding applicable emission limits. The district...
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