Every year, Britain’s electricity system operator publishes its view of how winter is likely to go. Its early view for winter 2026/27 is reassuring, but it doesn’t mean you won’t have a power cut. Here’s what it says, and what it means for your home.
The short version
- The grid operator expects enough electricity for this winter.
- A national shortage is very unlikely.
- Most UK power cuts are local, caused by storms and faults, not national supply.
- So the sensible thing is to prepare for a local cut of a few hours to a few days.
What the outlook says
The National Energy System Operator (NESO) runs Britain’s electricity system. In its Early View of Winter 2026/27, published in June, it said:
- It expects a margin of about 5.5 GW of spare capacity over expected peak demand this winter, roughly 8.8%. That’s enough to be classed as adequate.
- The modelled risk of supply falling short is well within the government’s reliability standard.
- New battery storage, gas power stations and wind farms are helping to cover rising demand.
- The tightest days are likely to be in mid-to-late January, when NESO may ask for extra help from the market.
- It flagged risks including global gas markets, electricity imports from Europe, cold, still weather, and disruption to gas shipping through the Strait of Hormuz.
NESO usually publishes a fuller Winter Outlook in the autumn. We’ll update this briefing when it’s out.
So will there be power cuts this winter?
Almost certainly, somewhere. But not because the country runs out of electricity.
The vast majority of power cuts happen on the local network: the cables, poles and substations near your home. They’re usually caused by:
- storms and high winds bringing down lines or trees
- flooding damaging substations
- snow and ice on overhead lines
- equipment faults and accidental damage, such as diggers hitting underground cables
A big storm can leave thousands of homes without power for a day or more, even in a winter when the national grid has plenty of supply.
What this means for your household
You don’t need to worry about national blackouts. You do want to be ready for a local power cut lasting from a few hours to a few days, especially between November and February.
That means:
- Light: head torches and a lantern, not candles.
- Warmth: a plan for staying warm without your boiler. See how to stay warm in a power cut.
- Power: a charged power bank for phones. See our power bank guide.
- Information: save 105 in your phone, and keep a battery radio for local news.
- Safety: a battery carbon monoxide alarm. See why it matters.
- Help: join the Priority Services Register if anyone at home is vulnerable.
Watch the weather, not the grid
The best early warning for a power cut is the weather forecast. When the Met Office issues an amber or red warning for wind, snow or ice, that’s your cue to charge everything and check your kit. Read our guide to what Met Office warnings mean.
3 things to do this week
- Charge your power banks and put them somewhere easy to find.
- Check your torches and batteries actually work.
- Save 105 in your phone, and NIE Networks (03457 643 643) if you’re in Northern Ireland.
Source: NESO, Early View of Winter 2026/27. Read our 72-hour basics to get ready.