Ofgem will raise the energy price cap by 13% from 1 July 2025, pushing the typical household bill to £1,823 a year. That is £143 more than the current cap, the highest level since January 2024. For a 3-bed semi using 12,000 kWh of gas and 2,900 kWh of electricity, the monthly direct debit will climb from £140 to £152.
The increase, as reported by Secret London, is driven by wholesale gas prices that remain 40% above pre-crisis levels and higher network charges approved by Ofgem. The regulator has also allowed suppliers to recover £3 billion in bad debt from the pandemic and 2022 crisis, a cost spread across all customers.
Who qualifies, and who doesn’t
The cap applies to default tariff customers on standard variable tariffs, about 85% of UK households. Those on fixed deals are not directly affected until their contract ends. Prepayment meter customers will see a similar percentage rise, though their absolute cap is slightly lower at £1,795 because of lower standing charges.
Vulnerable households on the Warm Home Discount will get £150 from October, but that covers just over half the July increase. The £400 Energy Bill Support Scheme from 2022 has not been renewed. Pensioners and low-income families face the hardest squeeze.
Energy Saving Trust data suggests that over 6 million UK homes still have cavity walls unfilled and lofts with less than 270 mm of insulation. Those homes are effectively heating the street, and paying for it.
What it costs a typical 3-bed semi
A typical semi-detached house with gas central heating and single glazing will see its annual bill rise from £1,680 to £1,823. That is £143 extra, about the cost of a weekly food shop for a family of four. Standing charges will also rise: electricity standing charge goes up from 53p to 57p per day, gas from 27p to 30p.
But the cap is not a ceiling on total bills. Heavy users, homes with electric heating, poor insulation, or large families, will pay more. A 5-bed detached house with electric storage heaters could see bills exceed £3,000 even under the cap.
The catch is that many households cannot switch away from the cap because fixed deals are scarce. The cheapest fixed tariff on the market is currently £1,850, actually above the new cap, so there is no saving to be had by switching right now. That may change by autumn when suppliers typically launch winter fixes.
How to cut your bill, and improve your EPC
The most effective response is to reduce demand, not just switch suppliers. Loft insulation costs around £300–£500 for a typical semi and saves £150–£200 a year, paying back in under three years. Cavity wall insulation costs about £500–£700 and saves £200–£300 annually. Both are eligible for ECO+ grants of up to £1,500 for low-income households.
Draught-proofing windows and doors costs £100–£200 and saves £50–£80 a year. Smart thermostats like the Hive or Nest save 10–15% on heating bills, roughly £120 a year on a typical gas bill. For those with bigger budgets, solar panels (cost £5,000–£7,000) save £300–£500 a year and lift an EPC by one band. Heat pumps under the Boiler Upgrade Scheme now offer £7,500 grants, enough to cover most of the installation cost.
Ofgem data shows that homes with an EPC rating of C or above pay about £400 less per year on energy than those rated D or below. Improving from D to C typically costs £2,000–£4,000 in insulation and glazing upgrades but adds 3–5% to property value, a net gain of £6,000–£10,000 on a £200,000 home.
What to do now
Check your EPC rating on gov.uk. If it is D or below, book a free home energy assessment from your local authority or an approved installer. Apply for ECO+ grants before the scheme closes in March 2026. For heat pumps, the Boiler Upgrade Scheme runs until 2028, but installer waiting lists are already three to six months in many regions.
Set a direct debit based on your actual usage, not a fixed monthly amount. Overpaying by £30 a month means you are lending money to the supplier interest-free. Use the MoneySavingExpert energy calculator to check if a fixed deal becomes cheaper after July.
Households on standard variable tariffs can apply through gov.uk from 4 November. Eligibility closes on 31 March 2027.
Frequently Asked Questions
No, the cap only applies to standard variable tariffs. If you are on a fixed deal, your rate stays the same until the contract ends. However, when you renew, the new cap will set a floor for what suppliers offer, so expect higher fixed rates than today.
Yes. The ECO+ scheme offers up to £1,500 for insulation for low-income households. The Boiler Upgrade Scheme provides £7,500 towards a heat pump for any homeowner in England and Wales. Check eligibility on gov.uk, most grants are income-assessed, but the heat pump grant is universal.
