One fallen power line triggered a 3.49 GW grid surge across PJM
Original: One fallen power line exposed a growing AI data center problem. Here’s how to fix it.
Why This Matters
Simultaneous mass disconnections by AI data centers pose a systemic grid stability risk as capacity scales.
A single downed power line near Washington, DC, caused over 3 gigawatts of data centers to simultaneously drop off the PJM grid, triggering a voltage spike stretching from Northern Virginia to Chicago and taking more than 10 minutes to stabilize.
When a power line fell near Washington, DC, this week, Northern Virginia's dense cluster of AI data centers responded by switching to backup power almost simultaneously — removing approximately 3.1 GW of load from the PJM grid within 30 seconds. At peak imbalance, PJM carried 3.49 GW of surplus electricity, and full grid stabilization took over 11 minutes, far longer than the typical few-second recovery. IoT sensor startup Ting Labs captured the voltage spike spreading from Northern Virginia to Chicago, causing widespread light flickering across the region. The disconnected data centers accounted for roughly 3% of total PJM demand at the time, according to Reuters. Experts note that while 3% sounds small, the electrical grid requires near-perfect supply-demand balance; even modest deviations trigger protective failsafes. ON.Energy CTO Ricardo de Azevedo called the event 'the canary in the coal mine,' noting such large-load disconnection events are 'happening more and more.' Ali Zain Banatwala of the Independent Electricity System Operator told TechCrunch that data centers made disconnect decisions within seconds of each other, amplifying the original disruption. PJM manages grids across New Jersey to Illinois, serving 67 million customers as the largest U.S. grid operator. A similar event occurred on PJM's grid two years ago, raising concerns about grid resilience as AI-driven data center capacity continues to expand in the region.