US electricity grids face growing stress from heatwaves and AI expansion as record-breaking electricity demand pushes aging power infrastructure closer to its limits, according to a Bloomberg report. Across the United States, back-to-back heatwaves with temperatures exceeding 100°F (38°C) have forced millions of homes and businesses to rely heavily on air conditioning while the rapid growth of AI-powered data centres adds unusual, round-the-clock electricity demand. Regional Transmission Operators (RTOs), which manage electricity systems serving more than 150 million Americans, have issued multiple emergency alerts as reserve power supplies tighten.

The situation is particularly acute in regions hosting major AI infrastructure, where soaring electricity consumption is testing grids originally designed during decades of relatively flat demand growth.

Heatwaves and AI Are Driving Record Power Demand

Electricity demand across several major US grids has surged this summer as extreme weather coincides with expanding AI infrastructure.

The greatest pressure has been on PJM Interconnection, which supplies electricity to around 67 million people from Chicago to Washington, D.C. The grid serves Northern Virginia’s “Data Center Alley,” one of the world’s largest concentrations of AI and cloud computing facilities.

On 2 July, PJM recorded a historic 168 gigawatts (GW) of electricity demand, surpassing a record that had stood for nearly two decades as triple-digit temperatures spread across the Mid-Atlantic.

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Emergency Alerts Spread Across Multiple States

Grid operators have issued repeated emergency warnings to maintain reliability.

• The Midcontinent Independent System Operator (MISO) and the Southwest Power Pool (SPP) activated emergency measures covering parts of the Midwest and western United States.
• SPP also received federal approval to maximise electricity generation across states including Wyoming, Colorado, Utah, Arizona, Montana, New Mexico, and Nebraska.
• Meanwhile, PJM requested permission from the US Department of Energy to allow data centres to operate backup generators during periods of peak demand.

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Climate Change Is Intensifying Grid Stress

Experts say rising temperatures alone are not the only challenge.

Higher humidity, driven by climate change, is reducing overnight cooling, forcing air conditioners to operate longer into the evening and extending peak electricity demand.

Analysts also warn that aging transmission infrastructure is struggling to cope with the combination of persistent heat, increasing electrification, and the rapid expansion of AI computing facilities.

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Texas Shows a Different Path

While US electricity grids face growing stress from heatwaves and AI expansion, Texas has demonstrated greater resilience after significant investment in renewable energy.

The Electric Reliability Council of Texas (ERCOT) expects more than 114 GW of solar, wind, and battery storage capacity to be connected by the end of the year. Although ERCOT also set new demand records during this summer’s heatwave, it has not declared an energy emergency in nearly two years thanks to improved grid planning and additional generation capacity.

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Long-Term Investment Will Be Essential

Energy experts warn that electricity demand could nearly double over the next decade, largely driven by AI data centres, electrification, and industrial growth.

Industry analysts say upgrading aging transmission networks, expanding generation capacity, and modernizing grid infrastructure will require billions, potentially trillions, of dollars in investment over the coming years. Without accelerated investment, regions with rapidly growing electricity demand could face increasing reliability risks during future heatwaves and extreme weather events.

Key Highlights

The growing strain on US electricity grids highlights how climate change and the AI revolution are reshaping energy systems. While some regions are strengthening resilience through renewable energy and storage investments, others face mounting pressure from aging infrastructure and rapidly rising demand. Experts agree that maintaining reliable electricity supplies will require faster grid modernisation, expanded transmission capacity, and long-term investment to support the country’s evolving energy needs.

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