The nation’s largest regional transmission system operator rode through the effects of the derecho storm and weekend heat wave with no difficulty.
PJM, which operates the grid that stretches from mid-Atlantic states to the Chicago area said it would keep a hot weather alert in effect for Friday and Saturday. High temperatures were expected to reach 100 degrees F in Chicago, 97 in Philadelphia and 101 in Baltimore, the biggest cities in PJM, according to AccuWeather.com.
PJM forecast that peak demand Friday would reach about 150,000 MW after hitting a preliminary peak of 148,392 MW on Thursday. That is well below the grid’s all-time peak of 163,760 MW, set during a brutal heat wave in July 2011.