Fixed vs Variable Energy Tariffs: Which Is Best in 2026?

Fix and lock in your prices, or stay variable and ride the cap? A practical guide to choosing the right tariff for your household this year.

Summary

A fixed tariff locks your unit rates for electricity and gas, along with your standing charge, for a predetermined period, typically 12 to 24 months. This offers predictability in your energy expenditure. In contrast, a Standard Variable Tariff (SVT) fluctuates with the Ofgem price cap, which is reviewed and updated every three months. At present, certain fixed tariffs are priced slightly below the current Ofgem price cap, though this margin is often narrow and varies significantly between suppliers. This blog will delve into the intricacies of both options, offering a detailed guide for UK households navigating the energy market in 2026.

What this means in plain English

Let's break down the core differences between these tariff types, alongside a brief mention of a more niche option:

Fixed Tariff: With a fixed tariff, the price you pay per kilowatt-hour (kWh) for electricity and gas, as well as your daily standing charge, is set and guaranteed for the entire duration of your contract. This means if wholesale energy prices, and consequently the Ofgem price cap, rise during your contract term, your unit rates will remain unchanged. Conversely, if wholesale prices fall, you won't immediately benefit from those reductions. Most fixed tariffs come with an exit fee, typically ranging from £25 to £75 per fuel (i.e., £50 to £150 for a dual-fuel household) if you decide to switch providers or tariffs before your contract concludes. Some competitive offers may waive these fees, but this is less common.

Standard Variable Tariff (SVT): An SVT is the default tariff that suppliers place customers on once a fixed contract ends, or if they haven't actively chosen a specific tariff. The prices on an SVT are directly governed by the Ofgem energy price cap. This cap sets the maximum unit rates and standing charges that suppliers can charge for a typical household's energy consumption. Since the cap is reviewed quarterly (January, April, July, October), your SVT prices will adjust accordingly on these dates. The primary advantage of an SVT is flexibility: there are no exit fees, allowing you to switch to a different tariff or supplier at any time. The downside is exposure to market volatility; if the price cap rises, your bills will increase.

Tracker Tariffs: A smaller number of more innovative suppliers, such as Octopus Energy, offer tracker tariffs. These are designed to closely follow wholesale energy market prices, often adjusting daily or weekly. While these can offer significant savings when wholesale prices are low, they come with a higher degree of risk. If wholesale prices rapidly spike, your bills could increase dramatically and quickly. These tariffs are generally best suited for consumers who are comfortable with market volatility, are willing to monitor wholesale prices, and potentially have smart meters that can maximise these tariffs' benefits.

The optimal choice for your household in 2026 hinges on your personal risk appetite, your financial stability, and your outlook on future energy price movements.

How this affects your household bill: A Deeper Dive

To illustrate the financial impact, let's consider a hypothetical dual-fuel household with "typical" consumption, as defined by Ofgem for the price cap calculations. For this example we use the Ofgem price cap for 1 October to 31 December 2026: £1,723 a year for a typical household using 2,500 kWh of electricity and 9,500 kWh of gas, paying by Direct Debit.

Current Ofgem Price Cap (1 October to 31 December 2026):

| Fuel | Unit Rate (p/kWh) | Standing Charge (p/day) | Annual Cost (Typical) | | :----------- | :---------------- | :---------------------- | :-------------------- | | Electricity | 26.32p | 54.83p | £858.13 | | Gas | 7.97p | 29.68p | £865.48 | | Dual Fuel | | | £1,723.61 | Note: GB-average Direct Debit rates for typical use. Rates include VAT (5% on gas; 0% on electricity from 1 October 2026 to 30 June 2027). Regional variations apply.