A fixed energy deal is a chance to regain control. By locking in a fixed rate per kilowatt-hour (kWh) for a given period, you can protect yourself from potential price increases and enjoy greater peace of mind.
With Simply Switch, it’s easy to compare fixed energy tariffs from quality suppliers, find the best rates, and switch easily, saving you money and time and providing price security.
A fixed energy tariff is an agreement with your supplier where the unit rates (what you pay per kWh for electricity and gas) and standing charges (the daily supply charges) are set for the duration of your contract.
Most fixed contracts last for 12 or 24 months, although some suppliers offer shorter or longer contracts. During this time, your unit rate is locked in, so your bills only change in accordance with how much energy you use.
You need to understand the distinction between a fixed and a capped tariff:
Fixed tariffs are ideal for households that have to plan for fixed expenses, while capped tariffs can prove more economical if the market is expected to drop.
Some of the best fixed energy tariffs available in the market today are provided below.
| Supplier | Tariff Name | Estimated Annual Bill |
|---|---|---|
| Outfox Energy | Merry Fix-Mas 2025 12M V2.0 | £1,519.01 |
| Outfox Energy | Fix'd Dual Dec25 12M v4.0 - Family Advantage+ | £1,521.52 |
| Fuse Energy | December 2025 Fixed (13m) v1 | £1,548.52 |
| So Energy | So Larch One Year – Green | £1,553.27 |
| Ecotricity | EcoFixed - 1 Year Jan 26 v1 | £1,572.20 |
| So Energy | So Larch 18 Month – Green | £1,576.22 |
| OVO energy | 1 Year Fixed + Boiler Cover 18 December 2025 | £1,582.39 |
| E.ON Next | Next Fixed 12M V108 | £1,588.17 |
| Sainsbury's Energy | Sainsburys Fix and Reward Fixed 12m v65 | £1,592.89 |
| London Power | my london 12m fixed November 2025 v2 | £1,620.01 |
To view the latest available rates for your region, use the Simply Switch energy comparison tool to obtain a live, personalized quote.
Energy prices are influenced by global supply and demand, geopolitical unrest, and seasonal variations. With a fixed tariff, your prices are locked in for the entire contract term, protecting you from unforeseen price rises.
A fixed tariff is predictable. You’ll know an exact rate you’re being charged per unit, so you can forecast monthly or annual energy costs with certainty, ideal for households on limited budgets or fixed incomes.
Energy usage typically rises in colder weather. Knowing your rate won’t go up means you can heat your home and use appliances without worrying about surprise hikes in your bill.
Fixed tariffs can be particularly useful for tenants or families who are managing shared bills, since everyone knows how much they will be paying each month.
Most fixed-rate tariffs have an exit fee, usually £25 to £50 per fuel, if you switch supplier before your contract ends. This fee compensates suppliers for the early termination.
If wholesale energy prices fall or the energy price cap is reduced, your fixed rate will remain the same, meaning you might pay slightly more than those on standard variable tariffs (SVTs).
While your unit rate is fixed, standing charges can sometimes be adjusted by suppliers due to regulatory or operational reasons.
If you prefer to monitor your tariff regularly or respond to market fluctuation, a fixed plan may appear restrictive compared to a variable plan.
Fixing your energy rate depends largely on market conditions and your individual preference for stability.
When your fixed contract terminates, your supplier will put you on their standard variable tariff (SVT) automatically unless you choose a new offer. SVTs tend to be more expensive, so you need to do something before your contract expires.
You have a 49-day switching window before your fixed tariff expires, during which you can switch to a new deal or supplier without paying exit fees. This is the ideal time to shop around and secure another competitive rate.
It’s not difficult to get the right fixed-rate tariff. Simply Switch makes it easy to compare the latest tariffs of the leading UK energy providers in three simple steps:
Compare fixed energy deals now »
A fixed energy tariff offers protection, certainty, and a guard against rising costs, ideal for families looking for financial security in an unpredictable market.
With fixed energy plan comparison through Simply Switch, you can simply identify the right plan, lock in your rates, and switch effortlessly to a new supplier.
Do not allow the prices to increase, switch and compare today with Simply Switch and take control of your energy bills.
A fixed tariff locks in your rates for the contract term, while a variable tariff fluctuates in line with the Ofgem energy price cap.
Most fixed tariffs come with exit fees, but there are providers that waive them or offer fee-free switching during your final contract term.
Fixed contracts typically last for 12, 18, or 24 months, with some suppliers now offering longer periods for additional stability.
Yes. You can change at any time, but there may be exit charges to pay unless you’re in the final 49 days of your contract duration.
Savings are based on future market conditions. Fixing provides price certainty and protection, even if it does not always ensure the absolute lowest rate.