Wholesale gas prices jumped 8% in a single day last week on news of heightened tensions in the Middle East. That is not a theoretical risk, it is a direct line to your October direct debit.
Sky News has reported that UK power supplies could face disruption if the Iran conflict escalates, as reported by Sky News. The UK still relies on gas for about 40% of its electricity generation and the vast majority of home heating. A supply shock in the Strait of Hormuz, through which 20% of global LNG passes, would hit British bills within weeks.
What a conflict means for your energy bill
Ofgem’s price cap is updated every three months based on wholesale costs. When those costs spike, the cap follows. In the 2022 crisis, the cap rose from £1,277 to £3,549 in 18 months. A new Iran-related disruption would not repeat that scale, but even a 10% wholesale rise adds roughly £80 a year to a typical household’s gas and electricity bill, according to modelling by the Energy and Climate Intelligence Unit. The catch is that the cap protects no one from the initial surge; it merely smooths the pass-through over a quarter.
Households on fixed tariffs are not immune either. Suppliers price fixed deals based on forward wholesale curves, which already price in geopolitical risk. The cheapest fixes today are 6-8% higher than last month, brokers report.
Who gains from instability, and who pays
The irony is that the UK is now a net exporter of electricity some days, thanks to wind and solar. But because the marginal price of electricity is still set by gas under the current market design, a gas spike pulls up the cost of every kilowatt-hour, even one generated by a British wind farm. That is the flaw that campaigners and the Energy Security Secretary have called ‘broken’. A typical 3-bed semi with no solar or battery sees its whole bill rise. A home with solar panels and a battery, especially one paired with a heat pump, can draw stored power during peak hours and cut grid purchases by 60-70%.
The Boiler Upgrade Scheme currently offers £7,500 off a heat pump installation. That is roughly half the typical cost. Combined with good insulation, a heat pump can reduce gas consumption by 100%. For homeowners with off-street parking, an EV charger can further shift load to cheap overnight tariffs.
EPC ratings and resale value in a volatile market
An Energy Performance Certificate rates homes A to G. A home rated C or above typically sells for 5-10% more than an identical D-rated property, according to government data. Upgrades that improve EPC, cavity wall insulation (£500-1,500), loft insulation (£300-600), solar panels (£5,000-6,500), also reduce exposure to gas price volatility. The government’s proposed Future Homes Standard will require new builds to be low-carbon from 2025. Existing homes will face pressure to upgrade, especially if mortgage lenders start linking rates to EPC ratings, as several have signalled.
What this misses is timing. The cheapest time to insulate a loft is before winter. The cheapest time to install a heat pump is before the next gas crisis. Waiting until the news cycle turns ugly means paying peak installer rates and waiting months for a slot. The Energy Saving Trust recommends booking surveys now for work in early autumn.
Three things to do this month
First, check your EPC rating on gov.uk. If it is D or below, get quotes for loft and cavity wall insulation, the most cost-effective measures. Second, assess whether your roof is suitable for solar. The Smart Export Guarantee pays you for surplus power, and a 4kW system can save £200-400 a year on bills. Third, if your gas boiler is over 10 years old, consider replacing it with a heat pump before the next supply shock. The Boiler Upgrade Scheme is open until at least 2028, but installer demand is rising. Households on standard variable tariffs can apply through gov.uk from 4 November. Eligibility closes on 31 March 2027.
Frequently Asked Questions
Not guaranteed, but the risk is real. The UK sources about 5% of its gas from Qatar and other Gulf states via LNG. If the Strait of Hormuz is disrupted, global LNG prices spike, and UK wholesale gas prices follow within days. The price cap would then rise at the next quarterly update.
Lead times vary. Solar panel installation typically takes 1-2 months from survey to completion. Heat pumps take 2-4 months, especially if you need new radiators or pipework. The Energy Saving Trust recommends starting the process at least three months before winter to avoid the autumn rush.
