News briefing · Published
NERC issues rare Level 3 alert over data center power swings
What is the NERC Level 3 alert?
On May 4, 2026, NERC issued a rare Level 3 Essential Actions alert aimed at large computing loads such as data centers. It followed repeated customer-initiated drops of more than 1,000 MW of load from the power system. The alert is about grid stability. Households can prepare by keeping backup power for key devices and a basic blackout kit.
A law firm's energy blog, Davis Wright Tremaine, reports that NERC issued a Level 3 "Essential Actions" alert on May 4, 2026.
What happened
The alert is aimed at large computing loads such as data centers. It cites repeated cases where customers caused drops of more than 1,000 MW of load from the bulk power system. Grid entities had to acknowledge the alert by May 11 and report on seven actions by August 3, 2026.
What it means for your home
The alert names repeated large drops in data center electricity use as the concern. It is about keeping the grid stable when those drops happen. A household cannot control that, but it can plan for a power cut.
What to do this week
- Make a list of devices that need power, such as the router, a refrigerator and any medical equipment.
- Plug sensitive electronics into a surge protector.
- Keep a charged portable power station or power bank for phones and lights.
- Put a flashlight and spare batteries in an easy spot.
- If you use a medical device, ask your doctor or pharmacist about a backup plan.
For a step-by-step plan, read the 72-hour blackout plan.
Sources
This briefing is general information, not medical, legal or electrical advice. In an emergency, call 911 or your local emergency number.