Cornwall households face £64 electricity rise under new price cap

If your electricity bill looks steeper this month, you are not imagining it. The new energy price cap came into effect on 1 July, making electricity more expensive for millions of homes across Great Britain. And in Cornwall, households are feeling it more than almost anywhere else in the South West.

New research from structural warranty experts Buildsafe has found that Cornwall is one of the region’s worst affected areas under the latest price cap. The study looked at government data on average domestic electricity consumption by local authority, then compared annual costs under the old April to June 2026 unit rate against the new July to September 2026 rate that is now in place.

Cornwall comes out third in the South West. Average domestic consumption stands at 4,470.20 kWh per household, higher than most other local authorities in the region. That pushes estimated annual electricity costs from £1,102.80 to £1,167.17, an extra £64.37 on the year. Across the UK, Cornwall ranks 16th for the biggest increase.

Why Cornwall is being hit harder than its neighbours

The gap between Cornwall and the least affected parts of the South West is wide. Exeter households face a rise of £42.68 a year, which is £21.69 less than the increase hitting Cornwall.

Only two areas rank above Cornwall in the region. Households in Cotswold are seeing annual costs rise by £72.39, and South Hams by £66.93. West Devon and Forest of Dean sit just below Cornwall, with increases of £60.04 and £58.89. At the other end, Plymouth and Exeter are the least affected, rising by £43.90 and £42.68, with Bristol not far off at £45.50.

The reason comes down to usage. Giles Fallan, CEO at Buildsafe, said: “Cornwall stands out in the South West because average household electricity consumption is among the highest in the region. When the unit rate increases, areas already using more electricity see the biggest cash rises, which is why Cornwall appears so high in both the regional and UK-wide rankings.”

He pointed to the county’s housing as part of the explanation. “Cornwall has a different housing profile to some of the South West’s more urban areas. Larger homes, older properties, rural and coastal communities, and households that may rely more heavily on electricity can all push usage up. That helps explain why Cornwall is seeing a bigger annual increase than places such as Plymouth, Exeter, Bristol or Torbay.”

A summer squeeze, not just a winter one

Energy bills tend to get talked about when the clocks go back. But Giles said the timing of this rise could sting.

“With hot temperatures already hitting parts of the UK and further heatwaves expected, this rise could feel even more frustrating for households. Energy bills are usually talked about as a winter issue, but summer can bring its own pressures too, especially when people are using fans, portable air conditioning units, extra refrigeration or working from home more during the day.”

What you can do to keep costs down

The core problem is usage, so the fixes are about using less. Giles said the key point is that Cornwall is not only paying more because the unit rate has gone up, it is being hit harder because average usage is higher in the first place.

His suggestions for cutting avoidable costs include keeping rooms shaded during the hottest part of the day, reaching for fans before portable air conditioning, improving insulation, and switching off appliances that are not being used.

The new July to September 2026 unit rate sits at £0.2611 per kWh, up from £0.2467 over the previous three months. Standing charges were left out of the calculations to isolate the impact of the unit-rate increase alone.