Best Dual Fuel Deals UK 2026: Cheapest Gas & Electricity Tariffs Compared

Compare the cheapest dual fuel deals — whole-of-market, updated daily

Most UK households are on dual fuel tariffs, and most are overpaying. The gap between the cheapest available deal and the average default variable tariff is consistently several hundred pounds per year. Our comparison covers every UK supplier and every tariff type — fixed, variable, tracker and green — and shows you total annual cost, not just unit rates.

Enter your postcode and usage below to see the cheapest dual fuel deals available at your address right now, ranked by what you'll actually pay over a full year.

What you'll need (takes about 2 minutes)

• Your postcode (tariff rates and availability vary by region)
• A contact email and number (so we can send your personalised results)
• Optional: your current supplier, tariff name and whether you want fixed or variable

One bill, one supplier

Managing gas and electricity with a single supplier means one direct debit, one account login and one customer service team. For most households it is simpler and reduces the risk of billing errors across two separate accounts.

Dual fuel discounts

Many UK suppliers offer a combined discount of £20–£60 per year when you take both gas and electricity on the same account. This discount is built into the tariff rate and automatically applied — you don't need to request it separately.

Easier to track and switch

When your fixed deal ends or a cheaper tariff launches, switching a dual fuel account means one call or one online form — not two separate processes with two suppliers on two different end dates.

The full tariff breakdown

Questions to ask before switching

1. Is the rate fixed or variable — and if fixed, for how long?
2. What is the total projected annual cost at my usage level — not just the unit rate?
3. Are there early exit fees, and when does the contract end?
4. Does the quote include all discounts (direct debit, paperless billing, dual fuel)?
5. Is the supplier rated well for customer service? A cheap tariff with poor support can cost you time and stress.
6. Is there a cashback offer for switching, and is it paid promptly?

Fix your dual fuel tariff if…

• You want certainty over what you pay each month regardless of market movements.
• A fixed deal is available at a rate at or below the current Ofgem price cap level.
• Energy price forecasts suggest the cap may rise in the coming quarters.
• You are on a tight budget and cannot absorb a sudden bill increase.
• You plan to stay at the same property for the full contract term and can avoid exit fees.

Stay on a variable tariff if…

• The best available fixed rate is significantly above the current price cap level.
• Energy price forecasts suggest the cap may fall in the coming quarters.
• You may need to move home within the contract period and want to avoid exit fees.
• You are comfortable with some month-to-month variation in your energy bill.
• You want the flexibility to switch immediately when a better deal becomes available.

What the cap covers

The Ofgem price cap limits the unit rates and standing charges on standard variable tariffs — it does not cap your total bill. Higher usage means a higher bill even under the cap. It does not apply to fixed-rate tariffs, which can be set above or below cap levels.

Quarterly cap changes

The cap is reviewed every January, April, July and October based on wholesale energy prices. If you are on a variable tariff, your unit rates change automatically at each quarterly update — up or down — without any action needed from you.

How to use cap forecasts

Analyst forecasts for future quarterly cap levels are published regularly by Cornwall Insight and others. If forecasts suggest the cap will rise next quarter, fixing now at a rate below the expected cap could lock in savings. If forecasts suggest a fall, staying variable may be better value.

The switching process

1. Use the EnergyPlus comparison tool — enter your postcode and current usage to see ranked dual fuel deals.
2. Select your preferred tariff and click through to the supplier's sign-up page.
3. Complete the sign-up form with your address, meter details and payment preference.
4. Your new supplier contacts your old supplier and manages the switch — no action needed from you.
5. Submit a meter reading on switch day to ensure your final bill from your old supplier is accurate.
6. Your new tariff begins and your first direct debit is taken in the following billing period.

Your rights when switching

• 14-day cooling off period: You can cancel any new energy contract within 14 days of signing up — no questions asked and no penalty.
• No supply interruption: Gas and electricity continue uninterrupted throughout the switch. The supply infrastructure does not change.
• Exit fees: If you are leaving a fixed deal early, your old supplier may charge an exit fee. Check your current contract before switching.
• Final bill: Your old supplier must issue your final bill within six weeks of your switch date and return any credit balance.

Comparing on unit rate alone

A tariff with a lower unit rate but higher standing charge can cost more annually than one with a slightly higher unit rate. Always compare projected annual cost at your usage level — this is the only figure that matters.

Ignoring exit fees on your current deal

If you are mid-contract on a fixed deal, early exit fees of £30–£75 per fuel can wipe out several months of savings from a cheaper tariff. Check your current contract end date and exit fee before switching — it may be worth waiting a few weeks.

Letting your fixed deal lapse

When a fixed deal ends, most suppliers move you automatically onto their standard variable tariff — which is rarely the cheapest option available. Set a calendar reminder six to eight weeks before your deal ends and start comparing early.

Not submitting a meter reading on switch day

Without an accurate opening reading on the day your switch completes, your old supplier may estimate your final bill incorrectly — leaving you to dispute charges after the fact. Take a meter reading on switch day and keep a photo as evidence.

Assuming dual fuel is always cheaper than split

While dual fuel deals often include a combined discount, this is not always the case. In some regions and at certain times, the cheapest gas and the cheapest electricity tariff come from different suppliers. Our comparison checks both options and flags the best outcome for you.

Fixing for too long at the wrong time

A two-year fixed deal can offer certainty but also locks you out of a falling market. In a volatile energy environment, shorter fixed terms of 12 months give you the security of a fixed rate with the flexibility to switch again sooner if prices drop.

What is the cheapest dual fuel tariff in the UK right now?

The cheapest dual fuel deal changes daily as suppliers update their rates in response to wholesale market movements. The only way to find the cheapest deal at your postcode right now is to run a live comparison using our tool above — annual cost rankings are updated every day.

Is it cheaper to get gas and electricity from the same supplier?

Often, but not always. Most large UK suppliers offer a dual fuel discount of £20–£60 per year, making a combined deal cheaper than split tariffs. However, in some cases the cheapest gas and cheapest electricity come from different suppliers and the saving from splitting outweighs the dual fuel discount. Our comparison checks both scenarios.

How much can I save by switching dual fuel supplier?

The saving depends on what you are currently paying and which deals are available at your postcode. Households switching from a standard variable tariff to the cheapest available fixed deal often save £150–£400 per year at average usage levels. Higher usage homes can save more. Run the comparison to see a personalised figure.

Can I switch dual fuel supplier if I am in debt to my current supplier?

If you owe more than £500 per fuel to your current supplier, they can legally prevent you from switching until the debt is cleared. For smaller debts, many suppliers will allow a switch and transfer the debt to your new account. Contact your current supplier to clarify your position before starting a comparison.

How long does a dual fuel switch take?

Most dual fuel switches complete within five working days for smart meter customers. Customers with traditional meters may take up to three weeks due to the need for final meter readings. There is no gap in supply at any point during the switch — your gas and electricity continue uninterrupted throughout.

Will switching dual fuel affect my smart meter?

SMETS2 smart meters (installed from 2018 onwards) retain full smart functionality when you switch supplier. Older SMETS1 meters may temporarily lose smart features after a switch, though most have now been remotely upgraded to behave as SMETS2. Check your meter type with your current supplier before switching if you are unsure.

Whole-of-market, updated daily

We compare dual fuel deals from every UK supplier — not just a selected panel — and update rates every day. You always see the cheapest deals available at your postcode right now, not last week's prices.

Annual cost — not just unit rates

Every deal in our results shows projected annual cost at your usage level, factoring in unit rates, standing charges and all available discounts. No misleading headline rates — just the number that actually tells you what you will pay.

Fixed and variable side by side

We show fixed and variable dual fuel deals in the same results, so you can compare the certainty of a fixed rate against the flexibility of a variable one and make an informed decision based on current price cap forecasts.