Suit against Duke Energy: The US Justice Department has filed a law suit against Duke Enegy Corp, charging that eight of the electric utility's power plant s illegally polluted the air for years. The law suit, filed on behalf of the Environmental Protection Aency (EPA), alleges that Duke vilalted the Clean Air Act by making major modifications to its coal-fired power plants in South and North Carolina without installing equipment to control smong, acid rain and soot.