East Coast bracing for extreme heat this July 4th weekend—temps expected to hit 100°F+ across parts of the region and Midwest.

PJM Interconnection, the largest U.S. grid operator, is forecasting record electricity demand. The surge comes from air conditioning loads plus rising power draw from data centers.

Travel disruptions already flagged: Delta waived change fees for flights out of NYC LaGuarque. Amtrak warned of potential heat-related delays.

Utilities on high alert as the grid faces a stress test during peak holiday travel.