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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Neither tariff type is always better. For a household in Great Britain, compare the fixed offer available now with the standard variable tariff using your own energy use, region and payment method. A competitive fixed tariff can make its specified rates predictable for the contract term; a capped variable tariff leaves you exposed to future cap rises and able to benefit if the cap falls. Rising oil prices alone are not a reason to fix: they do not translate directly, one for one, into household gas and electricity prices.
What is the difference between a fixed and variable energy tariff?
A fixed tariff holds specified unit rates for gas and electricity for an agreed contract period, subject to the supplier’s terms. A standard variable tariff (SVT) can change over time. In Great Britain, Ofgem’s price cap limits the unit rates and standing charges suppliers can charge SVT customers, and is updated every three months. The cap does not limit your total bill: what you pay depends on how much energy you use. Ofgem explains the cap and standing charges.
“Variable” can also describe other products. Tracker tariffs may change daily with live wholesale prices, while time-of-use tariffs charge different electricity rates at different times of day. Their terms and risks are not the same as an SVT under the cap. Check which kind of tariff you are being offered. The government describes tracker and time-of-use tariffs.
The price cap guidance applies to covered SVT customers in England, Scotland and Wales. Northern Ireland has a separate market. It does not cover customers who agreed a fixed tariff, people who heat their homes with heating oil, or customers supplied by a heat network.
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Why oil prices do not tell you whether to fix
Crude oil is part of the wider global fuel market, but it is not a direct dial for British household energy rates. Wholesale prices are affected by developments across gas, oil, coal and renewable fuels, as well as supply and demand. For household tariffs, wholesale gas and electricity costs, suppliers’ purchasing strategies and other regulated costs all matter. Ofgem outlines the wider market factors behind bills.
Suppliers buy energy ahead of time to manage price volatility. That hedging means a movement in wholesale markets does not necessarily appear immediately in household rates. SVT customers encounter price-cap changes on the quarterly timetable; a fixed-rate customer’s specified rates remain in place for the agreed term. Neither mechanism lets an oil-price headline predict a particular bill change. Ofgem explains wholesale costs, hedging and bills.
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Gas prices can also influence wholesale electricity prices: gas generation may set the price when it is the most expensive generation needed to meet demand. The relationship depends on the generation mix, including renewable output; it is not a simple forecast from crude oil to your electricity bill.
What the latest figures can—and cannot—tell you
For 1 October to 31 December 2026, Ofgem’s cap is an annualised £1,723 for a typical dual-fuel household paying by direct debit. This is an illustration based on typical use, not a limit or forecast for an individual household. Ofgem raised the cap by 4% for that period, citing higher wholesale gas prices linked to global events. The House of Commons Library reports average capped rates of 26.3p per kWh for electricity and 8.0p per kWh for gas; regional and payment-method differences apply. Ofgem’s Q4 2026 announcement; House of Commons Library: Domestic energy prices.
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsThose figures do not determine whether a particular fixed offer is good value. The cap covers more than wholesale energy: its components include network, policy, operating, supplier earnings, risk and VAT costs. Fixed offers also vary by supplier, region, usage and terms.
Historical averages are not personal savings forecasts, either. DESNZ estimated that combined bills in 2025 averaged £1,819 for fixed-tariff households and £1,952 for variable-tariff households, a £133 difference. That population-level comparison does not show that a fixed tariff available now will save you money. The average fixed tariff offered in May 2026 was above the cap, according to the House of Commons Library—an observation about offers at that time, not a live quote. DESNZ, Quarterly Energy Prices, March 2026.
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How to compare the tariffs for your household
Use your recent gas and electricity consumption in kWh, your region, payment method and meter arrangement to estimate costs on both options. Compare the complete terms, not just an advertised annual figure or unit rate.
- Find your usage. Use recent bills or your online account for annual gas and electricity consumption in kWh. If you cannot get a full year, use the best available period and treat the estimate accordingly.
- Compare unit rates and standing charges. Check the per-kWh charge and daily standing charge for each fuel on both tariffs. A lower unit rate can be offset by a higher standing charge, particularly for lower-use households.
- Estimate costs on the same basis. Apply your usage, region and payment method to each tariff. Compare the fixed offer’s cost over its full term with the current SVT rates, while recognising that future cap levels are unknown and the SVT comparison will not stay constant if the cap changes.
- Read the contract terms. Check the fixed term, any exit fee, the contract end date and what happens when the deal expires. An exit fee can make switching away early costly.
- Weigh certainty against flexibility. Decide how much you value predictable specified rates versus accepting future changes and the possibility that variable rates fall. Neither choice guarantees the lowest future bill.
For a current offer check, use an independent, up-to-date comparison service or contact suppliers directly. Make sure the results reflect your location and usage; a typical-household cap figure is not a substitute for your own estimate.
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When a fixed tariff may suit you
A fixed deal is worth considering when its full quoted cost is competitive with your current SVT alternative and you value predictable rates for the contract period. It can reduce exposure to later cap increases, but it also means you may not benefit from lower variable rates during the fixed term. The quoted rates are fixed; that does not make the tariff certain to be cheaper overall or remove the need to check other contract terms.
When a standard variable tariff may suit you
An SVT may suit you if you want to avoid a fixed-term commitment and are willing to accept rate changes as the cap is reset. You could benefit if capped rates fall, but you remain exposed to increases. A cap is a ceiling on specified rates and standing charges for covered tariffs—not a ceiling on the amount you pay for the energy you use.
How much weight should you give an oil-price headline?
Use it as a reminder that energy markets can be volatile, not as a tariff recommendation. On 27 May 2026, Ofgem chief executive Tim Jarvis said: “Today’s price change reflects continued volatility in global energy markets. This means higher wholesale gas prices, driven by ongoing conflict in the Middle East, is impacting the price we pay for energy.” That statement accompanied Ofgem’s announcement about the July–September 2026 cap; it describes that period’s stated driver, not a formula for predicting future bills. Ofgem’s July 2026 cap announcement.
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