DUKE ENERGY HIDES INFORMATION ABOUT POTENTIAL COAL ASH FLOODING: Environmental groups say they will sue Duke Energy for not telling the public what would happen if any of its dozens of coal ash dams fail. Duke’s 31 North Carolina coal ash basins hold 111 million tons of ash in water-filled ponds. Ash holds metals that can contaminate rivers, lakes and groundwater. Duke says the maps aren’t public because they hold “sensitive public security information,” which North Carolina law defines as details that might aid an attacker. Notices of intent to sue Duke filed by environmental groups Wednesday, however, say federal law doesn’t allow those exceptions. The groups say Duke is the only U.S. utility that withholds parts of its emergency plans from the public. The Southern Environmental Law Center, representing eight environmental groups, sent the notices regarding emergency plans for 10 North Carolina power plants. The power plants include Allen on Lake Wylie and Marshall on Lake Norman.