VALLEY FORGE, Pennsylvania — Every day, as dusk falls over the United States, millions of street lights blink on in towns and cities across the country. These quiet moments require a vast, unseen balancing act, because electricity demand and supply must be matched every second. Perhaps no one carries more responsibility for getting this balance right than PJM Interconnection, a private company which manages the flow of electricity to 60 million customers in 13 mid-Atlantic U.S. states. ...
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