Britain enters winter with its gas storage caverns barely half full, the lowest level in three years. That shortfall, as reported by This is Money, is not an abstract geopolitical risk. It is a concrete number on a direct debit.
What empty caverns mean for your bill
Centrica’s Rough facility, the UK’s largest gas storage site, is only 30% full this October, compared to 80% last year. Across Europe, storage is at 85% capacity; the UK sits at 55%. The gap matters because gas-fired power plants still generate 40% of British electricity. When storage is low, the UK must buy more gas on the spot market, where prices have jumped 20% since September. Ofgem calculates that a sustained 20% wholesale rise adds roughly £50 to a typical dual-fuel household’s annual bill. For homes on standard variable tariffs, that hit arrives immediately. Fixing a tariff now locks in current rates before the January price cap rise, which analysts expect to be 5-8% higher.
Who pays and who escapes
The pain is not evenly spread. Households with a fixed tariff ending this winter will roll onto expensive variable rates just as wholesale costs spike. Those with electric heating, or in poorly insulated homes, will feel the pinch hardest. A typical 3-bed semi using 12,000 kWh of gas per year already pays around £1,800 under the current cap. A £50 increase is manageable, but it compounds with higher standing charges and potential cold snaps. The catch: moving to a fixed tariff today might cost 10% more than the current cap, but could save £100 if wholesale prices rise further. The Energy Saving Trust advises households to compare tariffs every six months, not just at renewal.
What you can do before January
Short-term, switch tariff. Use a comparison site like Ofgem-accredited Uswitch or MoneySavingExpert’s Cheap Energy Club. Look for fixes with no exit fees. Longer-term, cut gas use entirely. A heat pump can reduce gas consumption by 70%, and the Boiler Upgrade Scheme offers £7,500 off installation. Insulating a loft (cost: £300-£500) saves about £290 a year. Draft-proofing windows costs £100 and saves £50. Every kWh saved is one less exposed to volatile wholesale markets. The government’s Great British Insulation Scheme also provides free or subsidised cavity wall and loft insulation for eligible households. Check eligibility at gov.uk.
Why this keeps happening
Britain’s gas storage capacity is a fraction of what it was a decade ago. The closure of the Rough facility in 2017 for maintenance, then its partial reopening in 2022, left the country reliant on imports from Norway and LNG from Qatar. Political decisions, not geography, created this vulnerability. The current government has not mandated minimum storage levels, unlike France or Germany. Until it does, every winter will bring the same warning. For homeowners, the only reliable defence is reducing demand. Fix the fabric of your home, fix your tariff, and fix your exposure to the next cold snap.
Frequently Asked Questions
Not for everyone. If you are on a fixed tariff, your rate is locked. But if you are on a standard variable tariff, you will likely see a rise when Ofgem announces the January cap. The £50 figure is an average, your actual increase depends on your gas usage and region.
It depends. If you can find a fix that is no more than 10% above the current cap, it may be worth it to protect against further wholesale rises. Check for exit fees and compare multiple offers. The Energy Saving Trust recommends fixing only if the deal is competitive and you plan to stay put for a year.
