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

Last week, a transmission line fault in Northern Virginia knocked about three gigawatts of data center load off the grid, the largest such drop-off yet. The data centers switched to backup diesel generators, and grid operator PJM and utility Dominion Energy said they stabilized voltage within about 10 minutes with no outages. But the event highlighted a growing problem: data centers are designed to disconnect quickly during brief voltage dips to protect their equipment, and when a huge cluster does this at once, it can destabilize the wider grid.

In response, regulators are pushing "ride-through" rules that would require data centers to stay connected during minor grid disturbances, the same standard already applied to power plants. Texas regulators approved rules taking effect August 1 for new large power users, including data centers and crypto mining operations; existing facilities aren't covered but must report and fix the problem within 180 days if they fail to ride through a disturbance. National reliability standards from NERC, the industry's watchdog group, are still years away from final approval.

For homeowners, this isn't a direct action item, but it matters for grid reliability. As data centers multiply and strain electricity demand nationwide, how well they're regulated affects the stability of the power supply everyone relies on, including the reliability of your own home's electricity. Some companies are already building backup battery systems and flexible data center designs meant to avoid these grid shocks altogether, which could ease pressure on the grid as this technology spreads.