The largest US power grid, PJM, has initiated emergency measures as electricity use approaches record peaks due to a severe heat wave affecting much of the country. Many areas, including DC and New York, are experiencing record-high temperatures, leading to widespread power outages that have left thousands without electricity. The extreme heat has prompted federal emergency orders aimed at managing power demand, particularly directing data centers to rely on backup generators to alleviate stress on the grid. With anticipated record electricity demand, PJM has warned that it can no longer meet expected energy requirements, highlighting concerns over potential blackouts. As the heat wave continues to impact travel plans for July 4 celebrations, officials are urging residents to conserve energy where possible.