PJM eyes data center, crypto reliability requirements after 3.8 GW of load trips offline

On July 22, about 3,800 megawatts of data center power in northern Virginia suddenly dropped off the electric grid, the largest such event ever recorded by PJM Interconnection, the grid operator that manages power for 13 Mid-Atlantic and Midwest states plus Washington, D.C. A fault on a power line in Dominion Energy's territory triggered swings in voltage and frequency, and PJM's overall load fell nearly 4 percent in the space of minutes. This is the third such incident in that region since 2024, all tied to the massive cluster of data centers in northern Virginia.

In response, PJM is considering new rules that would require data centers and crypto-mining facilities to keep running through minor grid disturbances instead of automatically disconnecting, a concept called "ride-through" standards. PJM staff say these facilities are cutting out too easily, even during faults the grid is designed to handle. Separately, the national reliability organization NERC is under federal order to finalize baseline rules for these large computational loads by the end of this year, though voltage and frequency ride-through requirements specifically won't be addressed until sometime next year.

This is a grid-planning and policy story, not something that changes anything about your own home right now. But it points to a broader trend: the huge growth of data centers and crypto operations is straining the power grid in ways that affect reliability for everyone connected to it, including homeowners in PJM's territory.