Mealey's (August 24, 2021, 9:22 AM EDT) -- ST. LOUIS — The Eighth Circuit U.S. Court of Appeals on Aug. 20 affirmed a lower court’s ruling that a Missouri coal-fired power plant operator violated the Clean Air Act (CAA) by making major modifications to units at a facility without a permit and upheld the injunction imposed. But it reversed the injunction against a second facility against which no CAA violations had been alleged....