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NERC Will Issue a May Alert on Data Center Load Volatility — The Grid's Reliability Overseer Says the Current System Can't Handle What's Being Built
US
Grid Reliability / Data Centers / Federal Oversight
April 22, 2026
Source: Utility Dive (covering NERC board meeting materials)
The North American Electric Reliability Corporation — the federal-designated body responsible for keeping the U.S. bulk power system reliable — will issue a new alert in May escalating its previous warnings about data center load behavior. The short version, in NERC's own language: utilities and operators “generally did not have sufficient processes, procedures, or methods to address emerging computational loads.” The body whose entire job is to prevent grid failure is publicly saying the industry is not ready for what's being built.
The new alert follows a Level 2 warning on large loads that NERC issued in September 2025. That earlier warning was triggered by what NERC called “widespread and unexpected customer-initiated load reduction of large loads” — a series of events, most occurring in 2024 and 2025, in which 1,000 megawatts or more of large-load output reduction happened without warning. NERC uses three alert tiers (advisory, recommendation, essential action); the May alert will be implemented while the body “develops updates to its registry criteria and reliability standards to account for the needs associated with computational loads."
The scale of what's coming is in NERC's own Long Term Reliability Assessment, published in January 2026. Summer peak demand across the bulk power system is now forecast to grow by 224 gigawatts over the next 10 years — a 69% jump over the prior year's forecast and a 24% increase from 2025 peak demand. NERC attributes most of that increase directly to new data centers.
"Rapid, major swings in load, experienced both in typical operations as well as in response to grid disturbances, can impact the [bulk power system's] ability to maintain frequency, regulate transmission voltage, and otherwise maintain stability,” NERC said in its September alert. The loads in question include data centers, cryptocurrency mining facilities, hydrogen electrolyzers, and other industrial loads — but it is data centers, and specifically AI-training data centers, that have moved the numbers into a range NERC is willing to publicly describe as beyond current reliability standards.
For context on what 224 GW of new summer peak demand means: the entire U.S. generating fleet today is roughly 1,200 GW of capacity. A 224-GW addition over ten years is larger than the total installed capacity of California, Texas, and Florida combined today. The forecast more than doubled in a single year — an unprecedented pace of revision for an industry that usually plans in decades.
What You Can Do
If your community is reviewing a data center proposal:
NERC's alerts and its Long Term Reliability Assessment are publicly available at nerc.com. The January 2026 Long Term Reliability Assessment and the September 2025 large-loads alert are the two documents worth citing in public comment when a developer claims a project has no reliability implications — NERC has on the record that it does not currently have the standards in place to guarantee that claim.
If you want to follow what NERC does next:
NERC board materials, reliability standards development, and alert archives are at nerc.com. The Federal Energy Regulatory Commission (FERC), which has final authority over NERC's mandatory reliability standards, takes public comments on proposed rule changes at ferc.gov.
If you want the state-level version of this conversation:
Each state's public utility commission (called a PUC, PSC, or OPSB depending on state) reviews how utilities plan for load growth. PUC rate cases and integrated resource plans are where the cost-recovery half of the NERC story lands — someone has to pay for the grid upgrades NERC is saying are insufficient, and the PUC decides whether that cost is borne by the hyperscaler driving the load or by all ratepayers. Search your state's PUC website for “integrated resource plan” or “large-load tariff” to find live proceedings.
Community Takeaway
This is the most important shift in the national conversation about data centers since communities started tracking it. Until now, the industry's response to local concerns has been some variation of “the grid will handle it — that's the utility's job.” NERC is now publicly saying the utilities cannot handle it under current standards, that the events of the last two years caught operators unprepared, and that a formal alert is being issued precisely because the reliability body does not trust the status quo to scale.
Communities weighing data center proposals do not have to argue the grid-reliability question from first principles anymore. The federal-designated reliability body has done it for them. The question for any local official reviewing a project is no longer “is there a grid concern?” — NERC has answered yes. The question is whether the specific project's interconnection, load profile, and ride-through behavior meet the updated standards NERC is now developing, and who pays for the upgrades required to get there. If a developer cannot answer those two questions with specifics, the project has not yet cleared the bar the grid's own overseer has set.
Source: Utility Dive (covering NERC board meeting materials), April 22, 2026.