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NERC warns large data centers and other 'very large loads' pose new reliability challenges
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Summary
NERC’s Large Load Task Force told FERC that clusters of very large electricity users—data centers, AI facilities and some crypto operations—have already caused multi‑hundred‑megawatt load drops and create new frequency and voltage stability risks; NERC recommended modeling, potential registration, and standards work.
At a FERC open meeting, Mark Lauby of the North American Electric Reliability Corporation briefed commissioners on draft findings from NERC’s Large Load Task Force about risks associated with integrating very large electricity loads.
"We gotta get our arms around them," Lauby said, describing how growth in data centers, AI computing hubs and some cryptocurrency operations has created pockets of load that can behave like large synchronous elements on the grid. NERC’s task force reported several significant events, including a roughly 1,500‑megawatt drop in Loudoun County, Virginia, and more than two dozen large load events in ERCOT in recent years.
Those simultaneous large drops can push system frequency and voltage outside normal ranges. "The load comes off, frequency goes up, and then starts coming back," Lauby said; when many megawatts disconnect at once, the consequence can mirror the effect of losing a large generator in reverse and could, in some scenarios, trip protection and exacerbate outages.
NERC recommended a three‑pronged approach: (1) quantify and model the emerging risk across regions and pockets of concentrated load; (2) identify gaps in existing reliability standards and whether new or modified standards are needed; and (3) develop risk‑mitigation guidance and, where appropriate, standard authorization requests. The task force is evaluating definitional thresholds for "large loads" (examples discussed ranged from 50 MW to 75 MW and above) and examining registration options—whether to register large loads directly or handle them through load‑serving entities.
Commissioners asked technical questions about whether recent incidents represented imminent threats. Lauby said the events were indicators of heightened risk rather than immediate system collapse, noting existing system stiffness and reserves have so far mitigated worst outcomes. He emphasized the need for modeling, data sharing and industry cooperation. "We need to know what they saw, what the ramp up speeds were," Lauby said about terminal‑level data; he added that while some data can be obtained from utilities under NERC procedures, there is no mandatory mechanism today to compel detailed load‑terminal data from large loads.
Next steps: NERC will continue LLTF work, hold collaborative sessions with large‑load operators and regional entities, refine modeling approaches and consider standards or registration changes if warranted. Commissioners signaled close attention to modeling, forecasting, and potential rules for large loads.
