As more data center trip off the grid, ‘ride-through’ rules gain steam

A big grid disturbance in Northern Virginia last week knocked about three gigawatts of data center load offline at once, the largest such event so far. Data centers switched to backup diesel power, and grid operator PJM and utility Dominion Energy said they stabilized voltage within about 10 minutes without causing outages. But the incident is part of a growing pattern: data centers are increasingly disconnecting from the grid during minor voltage disturbances to protect their equipment, and when a large cluster drops off at once, it can create excess power on the grid and risk cascading blackouts.

In response, regulators are pushing "ride-through" rules that would require data centers to stay connected to the grid during brief voltage dips, similar to standards power plants already follow. The national grid reliability body, NERC, has signaled it wants such rules but final federal approval could be years away. Texas has moved faster, approving rules that take effect August 1 for new large power users like data centers and crypto miners, though existing facilities are exempt unless they fail to ride through disturbances, in which case they must report the cause and fix it within 180 days. The data center industry has pushed back, questioning whether regulators understand the technical limits of their equipment.

None of this changes anything for homeowners directly, but it reflects rising strain on the grid from data centers and AI, a trend that can affect electricity reliability and costs in regions with heavy data center growth.