ATLANTA - A trial judge erred in finding unreliable government expert testimony that a power plant's modifications at three coal-fired plants would increase regulated gas emissions, an 11th Circuit U.S. Court of Appeals panel held Sept. 19 in a decades-old Clean Air Act case (United States of America, et al. v. Alabama Power Co., No. 11-12168, 11th Cir.; 2013 U.S. App. LEXIS 19329).