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These utilities were operating in level four of the plan after the Potomac Electric Power Co. suddenly lost a 640-mega watt generator at its Chalk Point Station.
Most customers wouldn’t notice a voltage reduction, said President Elmer Kaelin, because of a multifaceted strategy that helps maintain the system’s integrity without affecting customers.
“We’re part of an interconnected system of East Coast utilities,” Mr. Kaelin said, “and that’s where the problem originated. They, too, were reducing voltage to maintain this total system. Each day, we use load forecasts and contingency analyses
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