Louisville Gas & Electric Co. v. Kentucky Waterways Alliance

Louisville Gas and Electric Company (LG&E) sought a permit authorizing it to discharge certain pollutants into the Ohio River in conjunction with the operation of its recently expended generating facility. The Commonwealth of Kentucky, Energy and Environment Cabinet’s Division of Water issued the permit. The circuit court vacated the permit. The Court of Appeals affirmed. The Supreme Court reversed and reinstated LG&E’s permit, holding (1) in vacating the permit, the circuit court and Court of Appeals misapplied controlling federal law; and (2) the Cabinet’s determination that the LG&E permit should proceed under 40 C.F.R. 125.3(c)(1) was a reasonable interpretation of the regulation.