The largest power grid in the United States warns: Extreme high temperatures could trigger power shortages.

The largest power grid company in the United States, PJM Interconnection LLC, has warned that extreme high temperatures this summer may lead to power shortages for the first time. PJM serves about 20% of the American population from the Midwest to the East Coast. It is expected that this summer will be hotter than usual, especially in the states along the East Coast. PJM has noted that they have 7.9 gigawatts of reserve power supply through demand response programs. This plan requires participating commercial, industrial, and even residential users to reduce electricity usage to maintain grid stability in case of emergencies. While the possibility of extreme situations cannot be predicted, PJM's warning highlights the demand constraints faced by the power grid with recent excess power supply.