The wholesale price of gas has fallen by roughly 25% since the start of 2026, yet your January 2027 energy bill could still be higher than last winter. That is the uncomfortable arithmetic Martin Lewis laid out in his latest update, reported by Wales Online. For the typical UK household, the message is clear: do not mistake falling commodity prices for falling bills.
What the price cap actually captures
Ofgem’s price cap is not a simple pass-through of wholesale gas costs. It bundles wholesale energy (roughly 40% of the cap), network charges (about 25%), policy costs (15%), supplier operating costs, and VAT. Network charges alone are set to rise by nearly 12% in April 2027, adding about £30 to the average dual-fuel bill, as confirmed by Ofgem’s latest consultation documents. Meanwhile, policy costs, including the Renewables Obligation and the new Capacity Market levy, are climbing as the government funds its net-zero transition. The net effect? Even with gas at its cheapest since 2021, the cap may only drop by £50-£70 a year, not the £150-£200 that headline numbers might suggest.
Why your supplier won’t pass on the full saving
Martin Lewis pointed out a structural flaw: suppliers bought gas months ago at higher prices, so they are still locked into those contracts. The price cap is forward-looking, but suppliers hedge their positions. If they paid 80p/therm in Q3 2026 and spot prices are now 60p, they cannot instantly cut your bill. The catch is that the cap’s lag means households on variable tariffs will see a delayed, partial benefit. Fixed-rate deals, which have become rare, are even slower to adjust. The Energy Saving Trust advises that the best hedge for a homeowner is not a tariff but a fabric-first approach: reduce demand so that whatever the unit price, your total spend falls.
What a typical 3-bed semi can expect in 2027
A household using 12,000 kWh of gas and 2,900 kWh of electricity per year currently pays about £1,680 under the April 2027 cap (announced in February). If wholesale gas falls another 10% by October, the cap might drop to £1,610, a saving of £70. But if network charges rise as planned, that saving evaporates. The real action for homeowners is not in watching the cap; it is in insulation. A semi-detached home with cavity wall insulation and 270mm loft insulation saves roughly £300 a year on heating, according to the Energy Saving Trust. That is a permanent saving, immune to cap fluctuations.
What you should do now
First, check your current tariff. If you are on a standard variable rate, you are already under the cap, but you may find a fixed deal that locks in lower rates, though such deals are scarce. Second, apply for the Great British Insulation Scheme if your EPC is below C; you could get free or subsidised cavity wall or loft insulation. Third, consider a heat pump: the Boiler Upgrade Scheme offers £7,500 off installation, and running costs can be lower than a gas boiler if you have good insulation and a smart tariff. The deadline for the current grant round is March 2028, but funds are limited. Do not wait for the cap to fall, it will not fall far enough.
Frequently Asked Questions
Not necessarily. The price cap includes rising network and policy costs that offset the wholesale gas drop. The saving for a typical household is likely to be only £50-£70 per year, not the hundreds some headlines suggest.
Fixed deals are rare and often come with early exit fees. Check comparison sites, but most households are better off staying on the variable tariff under the cap and investing in insulation or a heat pump for long-term savings.
