Dual fuel business energy: is one supplier for gas and electricity worth it?

What dual fuel means for a business

A dual fuel deal puts your gas and electricity with the same supplier, usually on one account with one bill and often one contract end date. It is the business version of the household idea, but there is one big difference: business gas and electricity are separate supplies with separate contracts, each with its own meter point (an MPRN for gas, an MPAN for electricity), and there is no price cap on either. A supplier is free to price the two fuels however it likes.

Not every business has both fuels. A shop or office with electric heating may only have electricity, and a takeaway may be heavy on gas. Dual fuel only makes sense if you have two supplies.

The possible advantages

• One bill and one point of contact. Less admin, and one number to ring when something is wrong.
• One renewal date. Aligned end dates mean you are less likely to miss one and drift onto out-of-contract rates.
• Possible bundled pricing. A supplier may or may not price a combined deal more keenly; we have not found evidence that bundle discounts are standard for business customers, so test it with quotes.
• Simpler credit and deposit discussions. One supplier looks at the whole account, though a credit check can still apply. See business energy credit checks.

The possible drawbacks

• The best electricity price and the best gas price rarely come from the same supplier. Taking the best of each can beat a bundle.
• Locked in together. If one fuel's price becomes uncompetitive you may be tied to both until the end date.
• A dispute on one fuel can complicate the other. Complaints and deposits can touch the whole account.
• Different needs. Your gas use may peak in winter and your electricity may be flat all year, so different contract lengths could suit you better.

Worked example: bundle against split

Take a small restaurant that uses 20,000 kWh of electricity and 30,000 kWh of gas a year. Moneysupermarket Business published average fixed rates for microbusinesses in October 2026 (21 October 2026): electricity 28.4p/kWh plus 58.0p/day, and gas 8.8p/kWh plus 44.9p/day. Using those averages, as an indication only:

Item	Sum	Cost
Electricity units	20,000 × £0.284	£5,680.00
Electricity standing charge	365 × £0.58	£211.70
Gas units	30,000 × £0.088	£2,640.00
Gas standing charge	365 × £0.449	£163.89
Total before CCL and VAT		£8,695.59

Now suppose a dual fuel quote is 1p/kWh dearer on electricity (29.4p) and 0.3p dearer on gas (9.1p) but saves nothing on standing charges. The extra cost is 20,000 × £0.01 = £200 plus 30,000 × £0.003 = £90, so £290 more a year, which the convenience would have to justify. The reverse can also happen. The only way to know is to price both routes with your own figures. Our business energy cost calculator helps.

Those rates are comparison-site averages, not an offer. Real quotes depend on your location, usage, credit and contract length.

Can you switch just one fuel?

Yes. Each supply is switched on its own, so you can move your electricity and leave your gas where it is. Dual fuel is a choice, not a requirement. See switching gas or electricity separately and whether dual fuel is cheaper for a business.

Microbusiness status can also differ by fuel. A business can count as a microbusiness for one fuel and not the other: the tests include use of under 100,000 kWh of electricity or under 293,000 kWh of gas a year. See what counts as a microbusiness.

Tax on both fuels

Both gas and electricity carry the Climate Change Levy at the same main rate: 0.801p/kWh from 1 April 2026, rising to 0.827p/kWh from 1 April 2027. VAT is normally 20%, but the reduced rate can apply for qualifying use, such as small quantities up to 33 kWh a day for electricity and 145 kWh a day for gas. That reduced rate is 5% for gas; for qualifying electricity in Great Britain it is temporarily 0% from 1 October 2026 to 30 June 2027 (HMRC first said 31 March 2027) (HMRC VAT Notice 701/19: fuel and power). Using the restaurant above:

• CCL on electricity: 20,000 × £0.00801 = £160.20.
• CCL on gas: 30,000 × £0.00801 = £240.30.
• Subtotal: £8,695.59 + £160.20 + £240.30 = £9,096.09.
• VAT at 20%: £9,096.09 × 0.20 = £1,819.22 (rounded), giving about £10,915.31 in total.

Our VAT and Climate Change Levy guide and the VAT and CCL calculator cover the rules.

When dual fuel tends to make sense, and when it does not

It may suit you if

• you are a small site with modest gas and electricity use and value having one account;
• both contracts end around the same time anyway, so you can move both together;
• you have missed renewals before and want a single date to watch;
• a quote for the pair genuinely beats the best split, after the sums above.

Think twice if

• your two contracts end months apart, because you may need to pay a termination fee to pull one forward, or accept an out-of-contract period;
• you use a lot of one fuel and very little of the other, so the bundle effectively prices only one;
• you plan to change heating, for example swapping a gas boiler for electric heat pumps, which changes the balance between fuels. See business heating efficiency.

How to decide

1. Get a separate quote for each fuel and a combined quote for both, from the same sources.
2. Work out the full-year cost of each route.
3. Compare the contract lengths and termination fees.
4. Ask whether the broker's fee is shown in the Principal Terms, and on which fuel.
5. Check how bills will be itemised, so you can still see each fuel's cost. See reading your bill.

If the dual fuel saving is small, the better question is which route leaves you with one clear renewal date and no penalty if one supply needs changing.

Next steps

• Collect your MPAN, MPRN, usage and end dates for both fuels. See what you need for a quote.
• Compare dual fuel and split deals on total annual cost.
• If the dates differ, plan to align them at your next renewal.

If you switch both fuels at once, remember each supply still switches on its own timetable, so take meter readings for both on the changeover date and send them to the old and new supplier. Keep copies until your final bills arrive.