NESO's emergency power cut rules, explained for households

Why people are searching for this

Searches for "NESO emergency power cut rules" have risen sharply. In August 2026, Ofgem's approval of new rota rules for the grid operator was reported in the news as new emergency powers for rolling blackouts. The change is real, but it is a planning tool for a rare event. It does not mean power cuts are expected.

Here is what changed, in plain words, from the official documents.

Two sets of rules: one new, one old

Ofgem's decision explains why the new tool exists. The old short-notice tools cut the same customers each time. The government's emergency code shares cuts more fairly by rotating them, but it needs emergency powers and is built for long shortages. The new protocol gives NESO a quicker way to rotate cuts in the same fair way.

How a rota cut would work

• Each network area is split into 18 load blocks, each about 5% of demand, each with a letter.
• Up to 10% of demand is kept for protected sites and is not switched off.
• Under the new protocol, 4 blocks are kept back for sudden emergencies. The other 14 are switched off in alphabetical order on a cycle of about 3 hours.
• Network companies must have 8 blocks ready to switch off within 8 hours of NESO's notice, and all 14 within 24 hours.
• Under the government code, the "low-level" plan is the most likely one. It works through the blocks from A, usually for short peaks such as tea-time.

Who is protected, and who isn't

A few sites can stay on: critical infrastructure such as air traffic control, and some major hospitals with A&E departments. Protection isn't automatic: organisations must apply.

Homes are part of the rota. National Grid Electricity Distribution says this includes people on the Priority Services Register. That is why a plan for a 3-hour cut matters most for anyone who relies on powered medical equipment. If that's you and you don't have a plan, speak to your healthcare provider now.

The Priority Services Register is still worth joining. Ofgem says registered customers get priority support in an emergency and, where possible, advance notice of planned cuts. You can join if you've reached state pension age, are pregnant or have young children, have a disability or long-term health condition, or need medical equipment that runs on electricity, among other reasons.

How you would find out

• Your letter. Ofgem's decision says block letters are listed on customer bills. National Grid Electricity Distribution says to use your postcode at powercut105.com. Rotas are published only after emergency cuts are approved.
• The schedule. Under the government code, NESO advises by 14:00, the government confirms the plan by 15:00, and network companies get their schedules by 17:30 the day before.
• Reporting. Call 105 for a power cut in England, Scotland and Wales, or 03457 643643 in Northern Ireland (Be Ready).

Is a blackout coming this winter?

No official body has said so. NESO's Winter Outlook (23 October 2026) says supplies are expected to remain secure. It forecasts a margin of 5.9 GW, a 9.5% buffer above peak demand. NESO says there may be tighter periods, and that the "Electricity Margin Notices" you sometimes see in the news are a routine signal, not a sign of risk to supply.

Your 3-hour rota checklist

A 3-hour cut is short. A few simple steps make it easy.

1. Write down your letter and the number 105 on paper.
2. Charge phones and a power bank when a rota is announced. Be Ready says not to use your phone as a torch: it drains the battery.
3. Torches, not candles. Be Ready says torches are safer.
4. Keep the fridge and freezer shut. The Food Standards Agency says a fridge stays cold for up to 4 hours and a full freezer keeps food frozen for about 48 hours (about 24 if half full).
5. Plan for heat. Be Ready says gas boilers and heat pumps won't work without power. Fill a flask with hot water before the cut and wear layers.
6. Medical equipment. Know how long your backup lasts. Our runtime calculator can help you check a power bank or power station.
7. Landline. Digital landlines often need home power. Be Ready says to check with your provider, and to call 999 or 112 from a mobile in a life-threatening emergency.

Related guides

• Will there be blackouts this winter? What the 2026/27 outlook says
• Priority Services Register: a plain guide
• Who is my electricity network operator? UK power cuts by area
• National Grid power cut: how to report it and check the map
• Winter power cut checklist for UK homes

Free tools

• Power cuts near me
• Priority Services Register checker
• Power bank and power station runtime calculator
• Fridge and freezer power cut timer (FSA times)

We're an independent UK site, not the government. We check guides against official sources and link to them. In an emergency call 999.

More from the blog