How AI Data Centers Glitch Simultaneously Caused a 1,000-Mile Disturbance

Image: Tara Energy — By Rex Edison, *Yahoo News*

On a Wednesday morning in northern Virginia, lights flickered. Air conditioners groaned. Refrigerators made sounds they shouldn’t. No storm rolled through. No transformer blew. Instead, a transmission line went down, and the AI data centers powering your cloud storage, your AI chatbots, and your streaming queues did exactly what their protection systems told them to do: they all disconnected from the grid at once.

More than 3 gigawatts of demand — enough to power several mid-size cities — vanished almost simultaneously. The grid wasn’t ready for that.

According to Reuters, utility Dominion Energy confirmed that data centers’ internal control systems detected the fault on July 22 and automatically switched to backup power. PJM Interconnection — the largest U.S. grid, serving 67 million people from Washington, D.C. to the Midwest — registered a sudden frequency shift, the electrical equivalent of a cardiac arrhythmia. Bob Marshall, CEO of sensor-network company Ting Labs, told Reuters that his company’s 1.4 million sensors picked up voltage disturbances stretching from D.C. all the way to Chicago. “The power quality took a pretty big hit,” Marshall said. Grid disturbances normally resolve in milliseconds. This one took roughly 10 minutes.

More than 3 GW of demand disconnected almost simultaneously on July 22 — roughly 3% of PJM’s total load at that moment
Voltage disturbances registered across 1.4 million sensors from Washington, D.C. to Chicago (Ting Labs, via Reuters)

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