NESO Winter Outlook 2026/27: what it means for power cuts at home

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In NESO’s words, the country enters winter “with a resilient and well-prepared electricity system”. The margin sits comfortably inside the government’s reliability standard, and the separate gas outlook says supplies there are sufficient too.

So, no, the lights are not about to go out nationally. Anyone telling you otherwise this winter is selling something, and I say that as a man with links to torches further down the page.

The footnote

NESO also says there may be “periods of tighter margins”, as there are every winter. On those days it issues an Electricity Margin Notice, which sounds alarming and isn’t. It’s a routine request for more generation, used in most winters, and NESO is clear that it doesn’t mean supply is at risk.

If you see that phrase in a headline in January, you now know more than the headline writer.

Why I still own a lantern

Because the national margin has almost nothing to do with whether your house loses power.

Nearly all British power cuts are local. A storm takes down a line, a cable fails under a road, a substation floods. The grid can have gigawatts to spare while your street sits in the dark waiting for an engineer with a van. A healthy winter outlook doesn’t touch that risk, and winter is when the storms come.

So the sensible response to good news from NESO is the same as the response to bad news: a torch each, a charged power bank, a radio and three days of food. It costs very little, and you’re covered for the kind of power cut that does happen.