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Extreme heat drives record demand threat as America's largest grid prepares emergency measures

America's largest electric grid has secured emergency federal authority that could allow some data centers and other large electricity users with backup generators to temporarily reduce their power consumption as officials prepare for what could become the system's highest electricity demand in nearly two decades.PJM Interconnection, which serves about 67 million people across 13 states and Washington, D.C., said Wednesday it expects electricity demand to reach about 166,147 megawatts on Thursday, surpassing the current summer record of 165,563 megawatts set in 2006.The move underscores the gr...