The wholesale price of gas has jumped 40% in the past month, pushing the cost of heating a three-bed semi back above £3,200 a year. That is the number that matters to every UK homeowner right now, not the political promises made last autumn.
As reported by Bloomberg, the recent gas price surge has effectively cancelled the savings from the Energy Price Guarantee, which capped the typical household bill at £2,500. The catch is that the cap is not a hard ceiling on bills, it limits the unit price per kWh, but if you use more gas because of a cold winter, your bill still climbs. And when wholesale prices rise, the cap itself can be adjusted.
How the price cap works and why it is failing
Ofgem’s price cap is updated every three months based on wholesale costs. The current cap (January to March 2023) is £2,500 for a typical dual-fuel household using 12,000 kWh of gas and 2,900 kWh of electricity. But the next cap, due in April, is expected to rise to around £3,000, according to analysts at Cornwall Insight. That is a 20% increase in six months.
For a household on a standard variable tariff, the difference between £2,500 and £3,000 means an extra £500 a year, money that could have gone towards loft insulation or a new boiler. The government’s Energy Price Guarantee was meant to shield households from exactly this volatility, but it was always a political fix, not an energy market fix.
What this means for EPC ratings and home upgrades
Every £100 saved on annual bills is roughly equivalent to a 1-point improvement on an Energy Performance Certificate (EPC) for a typical home. A rise of £500 means the gap between a D-rated home and a C-rated home just got wider, literally more expensive to heat.
Homeowners who were considering solar panels or a heat pump should note: the payback period just shortened. A typical air-source heat pump installation costs £7,000–£13,000 after the Boiler Upgrade Scheme grant of £5,000. With gas prices staying high, the annual savings on heating could be £300–£500, meaning payback in 14–26 years. That is still long, but it is better than last year’s 20–30 year estimate.
But the real play is insulation. Loft insulation costs £300–£400 for a typical semi and saves £100–£200 a year. Cavity wall insulation costs £500–£1,000 and saves £200–£300. These measures pay back in two to five years, regardless of gas prices.
What you can do now
First, check your current tariff. If you are on the price cap, you are paying the maximum allowed, but suppliers sometimes offer fixed deals that are slightly cheaper. Compare on Ofgem-accredited sites. Second, apply for ECO4 insulation grants if you are on a low income or receive certain benefits. The scheme covers full cost for eligible households. Third, if you are planning a heat pump, book a survey now, installers are booked three to six months ahead in many regions.
Gas prices will not fall back to 2021 levels anytime soon. The UK’s storage capacity is low, and global demand from Asia is rising. The only hedge for homeowners is to use less gas. That means fabric first: insulate, draught-proof, and only then consider generation.
Frequently Asked Questions
The Guarantee caps the unit price, not the total bill. If wholesale prices rise, the cap can be revised upward every three months. The current £2,500 cap is under review and is expected to rise to £3,000 in April 2023.
Yes, if you can combine it with insulation. With gas prices high, the annual savings are larger. The Boiler Upgrade Scheme offers £5,000 off, but you must act before 2027. Check your home's heat loss first, a heat pump works best in a well-insulated property.
