Power line failure jolts PJM grid

A single downed power line outside Washington this week briefly turned Northern Virginia’s data-center belt into a grid-scale experiment. According to TechCrunch, more than 3 gigawatts of data centers stopped drawing power nearly at the same time, and the PJM Interconnection system took more than 10 minutes to recover from an event that normally clears in seconds. PJM data cited in the report shows roughly 3.1 gigawatts of load vanishing in about 30 seconds as facilities switched to backup power, with voltage effects seen across the footprint from Northern Virginia toward the Midwest.

PJM runs the grid from New Jersey to Illinois and serves about 67 million customers, a territory that now includes what TechCrunch calls the world’s highest concentration of data centers in Northern Virginia. The episode did not cause a blackout, but it did make lights flicker across the region—an outward sign of the balance problem grid operators obsess over: electricity supply and demand have to match almost perfectly in real time. When the line failed, the initial disruption was compounded by protective systems inside the data centers themselves. As voltage fluctuated, more sites disconnected within seconds of one another, removing demand faster than generation could respond, leaving the grid with surplus power and a voltage spike.

The technical issue is not that data centers have backup power; it is that many of them make the same decision at the same moment. Ali Zain Banatwala, a senior market models specialist at the Independent Electricity System Operator, told TechCrunch that sequential disconnection and reconnection of large loads clustered in one area would give grid operators a chance to manage the disturbance more gracefully. Without coordination, each facility’s sensible self-protection becomes a synchronized shock to everyone else.

Startups are already positioning themselves as the missing layer between hyperscale compute and the public grid. TechCrunch describes ON.Energy’s approach as an uninterruptible power supply for entire data center campuses—servers, chillers, and other equipment—using batteries and power-conversion hardware so the grid “sees” a steadier load. Instead of abruptly dropping off, a site could ride through short disturbances and ramp workloads up or down smoothly, reducing the incentive for instantaneous mass switching.

This week’s event is being treated as a preview of the next constraint on AI expansion: not chips, but the stability of the wires feeding the racks.

PJM’s own data showed the grid carrying extra electricity at the peak of the disturbance, while the region’s lights flickered and the data centers ran on backup power.