The energy price cap will rise again this winter, the third increase in twelve months. Ofgem confirmed on 23 August that the typical household bill will climb by £149 from October, reaching £1,717 a year. That is not a one-off spike. It is the new baseline, and it is being shaped by forces far beyond Britain’s shores.
As reported by the Liberal Democrats, the term ‘Trumpflation’ has entered the energy lexicon, a reference to how US trade policies, including tariffs on imported steel and aluminium, have pushed up global gas prices and made UK energy imports more expensive. The party’s analysis suggests the cap would be £300 lower if not for these external pressures.
Who qualifies, and who doesn’t
The price cap applies to households on standard variable tariffs, roughly 28 million homes. Those on fixed deals are protected until their contract ends, after which they fall onto the cap. But the cap is not a ceiling on your total bill: it caps the unit rate and standing charge. If you use more energy, you pay more.
Ofgem’s calculation assumes a typical household consumes 12,000 kWh of gas and 2,900 kWh of electricity per year. If your home is draughty or poorly insulated, your actual usage, and your bill, will be higher. The cap also varies by region: households in the North West pay about £40 more than those in London, due to network costs.
What it costs a typical 3-bed semi
For a 3-bed semi with gas central heating and no insulation upgrades, the October cap means an annual bill of roughly £1,850-£2,000. That is up from £1,568 in April 2023. The rise is driven by wholesale gas prices, which account for about 40% of the cap. Network charges add another 20%, about £340 a year, and policy costs (green levies) add £180.
The catch is that these network and policy costs are fixed: you cannot reduce them by using less energy. But you can cut the wholesale portion by reducing consumption. Loft insulation (costing £300-£500 installed, with grants covering up to £1,000) can save £200-£300 a year. A heat pump (costing £7,000-£13,000 after the Boiler Upgrade Scheme‘s £7,500 grant) can cut heating bills by 30-50% compared to a gas boiler.
Why this matters for your EPC rating
Your Energy Performance Certificate (EPC) rates your home from A to G. A typical 3-bed semi built before 1990 scores a D. That means you are leaking heat, and money. The Energy Saving Trust estimates that improving from EPC D to C can save £300-£500 a year on energy bills. That is roughly double the typical annual cost of a heat pump’s electricity.
The government’s Great British Insulation Scheme offers free or discounted loft and cavity wall insulation for households with an EPC rating of D or below. Combined with the Boiler Upgrade Scheme for heat pumps, you can cut your home’s carbon footprint and its running costs simultaneously. The payback period for a full retrofit (insulation plus heat pump) is typically 7-12 years, depending on current EPC and fuel type.
But, and this is the honest caveat, not every home is suitable for a heat pump. Homes with poor insulation or small gardens may need a hybrid system or a high-temperature heat pump. The government’s heat pump-ready installer database (MCS certified) can provide a site-specific quote.
What you can do, and by when
Households on standard variable tariffs can switch supplier or fix a tariff, though fixed deals are currently 10-15% above the cap. The better long-term move is to invest in efficiency. The Boiler Upgrade Scheme runs until 2028, but grants are capped at 60,000 installations per year, they may run out before the deadline. Apply now through gov.uk.
For insulation, the Great British Insulation Scheme has no cap on applications but prioritises low-income households. Check eligibility at gov.uk/gbis. If you are not eligible, local council schemes often offer top-up funding. The average cost of a full retrofit (insulation, draught-proofing, heat pump) is £12,000-£18,000, but grants and VAT relief (0% on heat pumps until 2027) bring that down to £5,000-£10,000.
The bottom line: the price cap will keep rising as long as global gas markets remain volatile. Your best defence is not a cheaper tariff, it is a home that needs less energy in the first place.
Frequently Asked Questions
Trumpflation refers to the impact of US trade policies, particularly tariffs on steel and aluminium, on global energy prices. The Liberal Democrats estimate these policies have added roughly £300 to the typical UK household's annual energy bill by increasing the cost of imported gas and materials for energy infrastructure.
Loft insulation typically pays for itself within 2-4 years through lower bills. A heat pump, after the £7,500 Boiler Upgrade Scheme grant, can pay back in 7-12 years depending on your current heating system and insulation levels. Both upgrades also increase your home's EPC rating, which can raise its market value by 5-10%.
