Extreme heat tests US power grid as AI data centers push energy demand

A major US heatwave is expected to push electricity use to near-record levels this week, straining grids operated by PJM Interconnection, NYISO, and MISO. Officials warn that demand is rising faster than new supply, a gap amplified by hyperscale AI data centers—concentrated in northern Virginia—that increase energy use and contribute to a data heat island effect. Health advisories accompany the forecast, with peak demand around 166.3 gigawatts projected for Thursday evening as temperatures climb above 38 C across much of the eastern half of the country.