Southeast Grid Emergency Highlights Summer Heat Strain, Data Center Demand Risks for Millions

The U.S. Department of Energy issued an emergency order under Section 202(c) of the Federal Power Act authorizing Duke Energy Carolinas to operate certain generating units at maximum output levels to avert potential blackouts amid extreme heat and surging air conditioning demand in the Carolinas. The order, effective briefly in June 2025 and echoed in similar 2026 actions, temporarily allows exceeding emissions limits on select plants as temperatures pushed heat indices above 100°F across North and South Carolina.

This move aligns with broader grid stress observed in PJM Interconnection territories, where real-time wholesale prices spiked above $1,300/MWh and reached peaks near $2,100/MWh during late June 2025 heat waves, driven by record electricity loads exceeding 160 GW. New York and New England operators activated demand response measures as humidity compounded cooling needs.

Deeper connections emerge with rapid data center expansion, which has accelerated capacity market price surges in PJM—from under $30/MW-day to over $300/MW-day in recent auctions—adding billions in costs that will flow to residential bills starting 2026. These loads compound traditional summer peaks, exposing vulnerabilities from retiring dispatchable generation faster than reliable replacements come online. While renewables and storage contribute marginally during peaks, firm thermal capacity remains critical during forecast errors and prolonged heat.

For millions, this translates to elevated blackout risks and higher utility rates this summer, as utilities balance reliability mandates against tightening environmental constraints. Official DOE statements emphasize using all tools to maintain affordable, reliable power, reversing prior policy directions.