U.S. EPA and U.S. Department of Justice announced settlement with Duke Energy Corporation to resolve Clean Air Act (CAA) violations at 5 coal-fired power plants across North Carolina. Specifically, said settlement resolves claims that Duke violated federal CAA by unlawfully modifying 13 coal-fired electricity generating units located at Allen, Buck, Cliffside, Dan River, and Riverbend plants without obtaining air permits and installing and operating required air pollution control technologies.