US Power Grid Faces Dual Pressure from Heatwave and AI Data Centers

The United States power grid is bracing for a critical test this week as a dangerous heatwave sweeps across the central and eastern regions while energy demand from artificial intelligence infrastructure continues to surge. Grid operators are warning that the combination could push electrical systems to their limits.

Temperatures are forecast to exceed 38 degrees Celsius (100 degrees Fahrenheit) from Boston to Washington, DC, with humidity driving the heat index as high as 46 degrees Celsius (114 Fahrenheit) in some areas. The extreme weather arrives during a peak travel period, with millions of Americans preparing for Fourth of July celebrations marking the 250th anniversary of US independence, and FIFA World Cup knockout matches scheduled in several affected cities.

Record demand projections

PJM Interconnection, the nation's largest regional grid operator, is forecasting record summer electrical demand of 166.3 gigawatts for Thursday evening. That figure would surpass the previous summer peak set in 2006. The New York Independent System Operator expects electricity demand to approach record highs, while the Midcontinent Independent System Operator, covering 15 states in the Midwest and South, could also see its peak demand record challenged. MISO authorities indicated they will rely on PJM for support in meeting consumer needs.

AI infrastructure strains capacity

The timing highlights a growing structural challenge for US electrical grids. In a May report, PJM executives warned of a "fundamental mismatch between how fast demand is growing and how quickly new supply can be built and connected to the grid." New power plants now take twice as long to build and cost twice as much as they did a decade ago.

Hyperscale data centers processing AI tools like ChatGPT, Gemini, and Claude are "adding load at an unprecedented pace," according to PJM's May assessment. These facilities require between 100 and 300 megawatts of electricity—enough to power hundreds of thousands of homes. Northern Virginia, within PJM's service territory, hosts the world's largest concentration of data centers.

Researchers have documented a "data heat island effect," finding that land surface temperatures around AI data centers rise by an average of 2 degrees Celsius (3.6 degrees Fahrenheit), with some locations experiencing increases up to 9 degrees Celsius (16.2 degrees Fahrenheit).

Why it matters

The convergence of extreme weather and AI-driven energy demand exposes a fundamental infrastructure challenge that will intensify as both climate change and computing needs accelerate. Grid operators face a decade-long timeline to add generation capacity while demand growth is measured in months, creating reliability risks during peak periods. For technology companies racing to deploy AI capabilities, energy constraints may become a limiting factor in expansion plans.

Public health concerns

The National Weather Service has urged people to limit outdoor activity, stay hydrated, and remain near air conditioning or cooling centers. A 2024 Journal of the American Medical Association report found that 21,518 deaths in the United States from 1999 to 2023 were heat-related, with 2023 recording the highest annual total at 2,325 deaths.

These details were first reported by Al Jazeera.