Electricity Demand in the Eastern United States Surged from Heat Wave - CleanTechnica

A significant heat wave across the Eastern United States in late June 2025 caused electricity demand to surge to multiyear highs in two major regional grids. On June 23, the PJM Interconnection, the largest wholesale electricity market covering 13 states and D.C., reached a peak load of 160,560 MW between 5:00 and 6:00 p.m., approaching but not surpassing its 2006 record of 165,563 MW. This demand spike drove real-time wholesale electricity prices to a peak of $1,334/MWh at 7:00 p.m., a sharp increase from $52/MWh a week earlier. Generation during this peak was primarily from natural gas (44%), nuclear (20%), and coal (19%), with solar contributing 6%. Notably, petroleum-based generation tripled compared to the previous day, reflecting its use as a costly but necessary resource during extreme demand. The following day, June 24, the ISO New England