What is a fixed-rate energy tariff?

A fixed-rate energy tariff is a contract where the unit rates for gas and electricity and the daily standing charges are locked in for a set period, usually 12–24 months. Your monthly bill can still change based on how much energy you use, but the price you pay per kWh and the daily charge will not increase during the fixed term, giving you more certainty over your energy costs.

Is a fixed energy tariff cheaper than a variable tariff in 2025?

Whether a fixed tariff is cheaper than a variable tariff in 2025 depends on wholesale energy prices and your usage. Fixed tariffs can be cheaper if you lock in when prices are low or expected to rise. However, if wholesale prices fall significantly, you may end up paying more than you would on a standard variable tariff. Our comparison table highlights where current fixed deals are cheaper or more expensive than the average variable tariff so you can make an informed choice.

How do I switch to a cheaper fixed home energy supplier?

To switch to a cheaper fixed home energy supplier, enter a few details about your property, current supplier, and typical usage into our comparison tool on this page. We will show you a list of fixed-rate deals ranked by estimated annual cost and potential saving. Once you choose a tariff, complete the quick online application and the new supplier will handle the switch, usually within 5–21 days, without any interruption to your gas or electricity supply.

What information do I need to compare fixed energy tariffs?

To compare fixed energy tariffs accurately, you should have your postcode, details of your current supplier and tariff name, your payment method (for example, monthly direct debit), and your annual kWh usage or yearly spend for both gas and electricity. You can find this information on a recent energy bill or in your online account. If you do not know your exact usage, we can estimate it based on your property type and typical consumption.

Are there exit fees on fixed-rate energy tariffs?

Many fixed-rate energy tariffs include exit fees if you leave before the end of the contract term, typically charged per fuel (gas and electricity). However, some fixed deals have no exit fees, giving you more flexibility if prices fall or you want to switch again. Our comparison clearly shows the exit fees for each tariff so you can weigh up the balance between price, contract length, and flexibility.

How long should I fix my energy tariff for in 2025?

In 2025, most households choose a 12-month or 24-month fixed tariff. A shorter fix can be suitable if you believe prices may fall and you want to switch again sooner, while a longer fix can give you more protection against future price increases. When comparing deals, consider your personal budget, how long you plan to stay in the property, and your appetite for risk if wholesale prices move up or down.

Will my energy supply be interrupted if I switch supplier?

Your energy supply will not be interrupted when you switch supplier. The physical gas and electricity come through the same pipes and cables, and the change is only in who bills you and the tariff you pay. The switch is managed electronically between your old and new suppliers, and you will normally just be asked to provide an accurate meter reading around the switch date.

Can I get a green or renewable fixed energy tariff that is still cheap?

Yes, several UK suppliers offer fixed-rate tariffs backed by renewable electricity or carbon-offset gas that are still competitively priced. On this page you can filter for green or low-carbon tariffs and compare them by estimated annual cost so you can choose a fixed deal that balances price with your sustainability preferences.

How often are the cheapest fixed energy deals for 2025 updated?

Energy suppliers can launch and withdraw fixed-rate tariffs at short notice, so we update the deals on this page frequently to reflect the latest prices and availability for 2025. To make sure you see the most accurate prices for your home, run a fresh comparison when you are ready to switch rather than relying on older quotes or previous results.

Cheapest Fixed Home Energy Suppliers UK 2025

Q: Who are the cheapest fixed home energy suppliers in the UK for 2025?

The cheapest fixed home energy suppliers in the UK for 2025 typically include a mix of large suppliers and smaller challenger brands that offer competitive one-year and two-year fixed tariffs. Prices and rankings change regularly as new tariffs are launched, so it is best to use our up-to-date comparison on this page to see which fixed-rate deals are currently the cheapest for your region and usage profile.

Lock in a low fixed gas and electricity rate for your home in 2025 and protect your bills from future price rises.

Compare cheap fixed home energy deals in minutes

Fixed home energy tariffs let you lock in your unit rates for gas and electricity for 12–36 months, giving you certainty over what you pay. Use our free comparison to find the cheapest fixed tariffs from trusted UK suppliers for 2025.

Compare prices from leading UK home energy suppliers
Find the cheapest fixed-rate electricity, gas or dual fuel deals
Protect your bills from unexpected price increases
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Have a recent bill handy – it helps us find the most accurate tariffs available for your home.

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What is a fixed home energy tariff?

A fixed home energy tariff is a gas and/or electricity plan where the unit rate you pay per kWh and sometimes the standing charge are fixed for a set period, usually 12, 18, 24 or 36 months. Your monthly direct debit may change slightly if your usage goes up or down, but the underlying prices stay the same for the length of the contract.

With a fixed tariff, you are protected against future price rises announced by suppliers or changes to the Ofgem energy price cap during your fixed period. This can make budgeting for your household bills far easier.

Key features of a fixed-rate home energy deal

Contract length typically between 12–36 months
Unit rates for gas & electricity stay the same for the whole term
Often includes an exit fee if you leave early
Can be dual fuel, electricity-only or gas-only
Most are paid by monthly direct debit, but some support other payment types

Who are the cheapest fixed home energy suppliers in the UK for 2025?

The cheapest fixed home energy supplier for you in 2025 will depend on your postcode, property type, usage, and whether you need dual fuel or a single fuel tariff. Prices also change regularly as suppliers launch or withdraw tariffs, so there is no one supplier that is always the cheapest for every household.

Instead of relying on generic price tables, our comparison service checks live tariff data from a wide range of UK residential suppliers to show you the cheapest fixed deals available for your specific home.

Popular UK suppliers offering fixed tariffs in 2025

While we always recommend running a personalised comparison, many households will find competitive fixed-rate options from well-known home energy suppliers such as:

British Gas – regularly offering fixed dual fuel and electricity-only tariffs with different contract lengths.
Ovo Energy – known for competitive fixed home energy deals and incentives for smart meter usage.
Octopus Energy – provides fixed tariffs alongside innovative smart and green energy options.
E.ON Next – offers a range of fixed tariffs for households who want price certainty.
SSE, EDF, ScottishPower, Shell Energy and other established suppliers – often compete strongly on fixed plans at different times of the year.

Smaller and challenger brands can also feature among the cheapest fixed-rate suppliers in certain regions or for certain usage patterns. That is why comparing the whole market is essential if you want the lowest price available to you.

Why choose a fixed home energy deal in 2025?

The UK home energy market continues to adjust after several years of high wholesale prices and supplier exits. While the Ofgem price cap offers some protection for standard variable tariffs, it can still move up or down every three months, making long-term budgeting difficult.

In 2025, many households prefer the certainty of a fixed tariff, especially if they find a deal that is cheaper than their current standard variable rate. Fixing your prices can help you:

Shield your home from future price cap increases
Plan your monthly household budget with confidence
Avoid shock bill increases during colder months
Benefit from introductory discounts and online-only tariffs

The key is to avoid overpaying for that certainty. Our comparison tool highlights whether a fixed tariff is cheaper or more expensive than the price-capped standard variable tariff available to you.

Fixed vs variable tariffs: quick comparison

Feature	Fixed tariff	Variable tariff
Unit price changes	Stays the same for the contract term	Can move up or down with the market
Budget certainty	High – easy to predict long-term costs	Lower – future prices are unknown
Exit fees	Common if you leave before the end date	Rare – most standard variable tariffs have no fee
Cheapest option	Cheaper if prices rise during your fix	Can be cheaper if prices fall

When comparing, always weigh the security of fixed prices against any exit fees and how likely you think prices are to change.

How to find the cheapest fixed home energy tariff for your home

Energy suppliers tailor prices to your region, meter type, and usage. To uncover the cheapest fixed energy supplier for your household, follow these simple steps:

Gather your details
Take a recent gas and electricity bill. Note your postcode, meter type (single rate, Economy 7, smart meter), and annual usage in kWh if available.
Tell us about your property
Use the short form above to share your postcode, property type and whether you use gas, electricity, or both. This allows us to filter tariffs for your home only.
Compare fixed vs variable deals
We will show you a list of tariffs ranked by estimated annual cost. You can clearly see which fixed deals are cheaper than your current tariff or the price-capped standard variable tariff.
Check contract length and exit fees
Before choosing a tariff, check how long the fix lasts and what you would pay if you leave early. A slightly higher unit rate without exit fees can sometimes be better if your circumstances might change.
Switch online in a few minutes
Once you are happy, complete the secure online switch form. You do not need to contact your old supplier – the new supplier handles the switch for you under the Energy Switch Guarantee.

Ready to lock in a cheaper fixed home energy deal?

Enter your postcode to see live fixed tariffs from UK suppliers and find out if you can cut your gas and electricity bills in 2025.

What affects the cost of fixed home energy in 2025?

Even when tariffs are labeled as the "cheapest fixed" deals, prices still vary from home to home. Some of the main factors that affect what you pay include:

Where you live – network and distribution costs differ across UK regions, so prices vary by postcode.
Your usage – higher-usage homes may access different unit rate bands compared with lower-usage households.
Meter type – Economy 7, smart meters, and prepayment meters are often priced differently.
Payment method – paying by monthly direct debit usually unlocks the cheapest fixed prices.
Online vs paper billing – online-only tariffs with paperless billing can be cheaper.
Green energy options – choosing 100% renewable electricity can sometimes cost a little more, though many green tariffs are now very competitive.

Because of these variables, the cheapest fixed home energy tariff for your neighbour might not be the cheapest for you – a personalised comparison is essential.

Tips for getting a cheaper fixed tariff

Provide accurate usage figures in kWh rather than just monthly spend.
Consider dual fuel tariffs if you currently have separate suppliers.
Opt for online billing and direct debit to unlock lower rates.
Compare tariffs each time your fixed deal is due to expire.
Check whether exit fees apply if you may move home soon.

Spending a few minutes to update your details can unlock more tailored, cheaper fixed deals for your home.

Frequently asked questions about cheap fixed home energy in 2025

Will I be charged an exit fee if I leave a fixed tariff early?

Most fixed home energy tariffs come with an exit fee per fuel (for example, one fee for gas and one for electricity) if you leave before the end of your contract. However, suppliers usually allow you to switch within the last 49 days of your fix without paying exit fees. Always check the tariff details before you agree to switch.

Can fixed tariffs be cheaper than the Ofgem price cap?

Yes. While the Ofgem price cap limits what suppliers can charge residential customers on standard variable tariffs, fixed tariffs are separate products. In 2025 some suppliers offer fixed deals that are cheaper than the price-capped rates, especially for customers who are happy to commit for 12–24 months.

Is it better to fix my energy prices or stay on a variable tariff?

This depends on your attitude to risk and how you think prices will move. If you want certainty and find a fixed deal that is cheaper than your current tariff, fixing can make sense. If you think prices may fall and you want flexibility, staying on a price-capped variable tariff could be better. Our comparison clearly shows the estimated annual cost difference between your current and new tariffs to help you decide.

Will my energy be cut off when I switch suppliers?

No. When you switch home energy suppliers, your gas and electricity are delivered through the same pipes and cables as before. There is no interruption to your supply. The only change is who you pay and the tariff you are on.

How long does it take to switch to a new fixed tariff?

Most domestic energy switches in the UK complete within 5 working days under the Energy Switch Guarantee, though some may take a little longer. You will receive confirmation from your new supplier with your start date, and you may be asked to provide a meter reading around your switch date.

Can I get a fixed tariff if I have a smart meter?

Yes. Many of the cheapest fixed home energy tariffs in 2025 are designed specifically for customers with smart meters. A smart meter allows your supplier to read your usage automatically, which can unlock more accurate billing and access to innovative time-of-use tariffs.

Find your cheapest fixed home energy supplier today

Stop overpaying for your gas and electricity. Compare live fixed home energy tariffs from leading UK suppliers and switch online in just a few minutes.

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Updated on 7 Dec 2025