CHARLOTTE, N.C. — A day after taking the rare move of implementing rolling, temporary blackouts across its power grid in the Carolinas, Duke Energy said it will not need to repeat that action on Sunday. The Charlotte-based electric utility made it through the morning peak without the need for “load reductions” Sunday, spokesman Bill Norton said. Duke Energy also had asked people to conserve energy usage through Christmas. Overwhelming demand for heat during the region’s arctic plunge over the weekend forced Duke Energy to roll out controlled blackouts of 15 to 30 minutes across the Carolinas S…
