The cheapest gas contract in Belgium
No single gas contract is cheapest for everyone, because two numbers compete: the price per kilowatt-hour and the fixed annual standing charge. Which one dominates depends entirely on how much gas you burn — heating a house, or running a hob.
| Provider | Plan | Price | Key points | View plan |
|---|---|---|---|---|
 MegaPartner |
Prepaid Flex | 6.53 c€/kWh |
| View plan |
 Octa+Partner |
Flux | 6.14 c€/kWh |
| View plan |
 DATS 24 |
Gaz Naturel Variable | 4.64 c€/kWh |
| View plan |
 EnergyVision |
Gaz bon marché 1 an fixe | 5.80 c€/kWh |
| View plan |
 Ecofix |
Flexy Online | 6.17 c€/kWh |
| View plan |
 Engie |
Basic Variable | 6.34 c€/kWh |
| View plan |
 Luminus |
BasicFlex Gaz | 6.48 c€/kWh |
| View plan |
 TotalEnergies |
myEssential Variable | 6.58 c€/kWh |
| View plan |
 Eneco |
Gaz Naturel Flex | 7.02 c€/kWh |
| View plan |
 Bolt |
Plenty Variable Online | 7.24 c€/kWh |
| View plan |
 Elegant |
Elegant Gaz | On request |
| View plan |
 Frank Energie |
Frank Gas | On request |
| View plan |
 Trevion |
Trevion Gaz | On request |
| View plan |
Prices and features surveyed on August 31, 2026. They may have changed since. Always check the offer on the provider’s website before signing up.
The two numbers that compete
Every gas contract in Belgium is built the same way: a price per kilowatt-hour for the energy you consume, and a fixed annual amount you pay whatever happens. A cheap unit price paired with a heavy standing charge and an expensive unit price paired with a light one can land within a few euros of each other over a year.
The crossover point is what matters. Below it, the standing charge decides; above it, the unit price does. For the contracts in our survey that point sits somewhere between 3 000 and 5 000 kilowatt-hours a year — well under what any gas-heated home consumes, and well over what a gas hob uses.
Do the arithmetic before you read the ranking
Take your annual consumption in kilowatt-hours from your last settlement invoice. Multiply it by the energy price of each contract. Add the annual standing charge. The smallest total is your cheapest contract, and it is the only ranking that applies to you.
Distribution tariffs and levies are not part of this arithmetic on purpose. They are identical for every supplier at your address, so they raise every total by the same amount and cannot move a single line of the ranking.
What a cheap headline price can hide
Some tariffs are conditional. Fully digital management, direct debit or electronic invoicing may be required to obtain the advertised price, and losing the condition means losing the price.
Promotional discounts are the other trap. A welcome credit lowers the first year and disappears afterwards; the contract you actually live with is the one priced without it. Run the arithmetic twice — once with the discount, once without — and decide on the second figure.
Our verdict
The cheapest contract per kilowatt-hour in our table also carries one of the heaviest standing charges. For a household that heats with gas it still wins comfortably; for a flat with gas cooking only, it does not. Read the two columns together or you will read the table backwards.
Frequently asked questions
Is the contract with the lowest price per kilowatt-hour always the cheapest?
No. It is only the cheapest above a certain consumption. Below that point the fixed annual standing charge weighs more than the unit price, and a contract with a higher price per kilowatt-hour but a lighter standing charge wins. The crossover sits between roughly 3 000 and 5 000 kilowatt-hours a year for the contracts we survey.
How much gas does a Belgian household use?
A house heated with gas typically burns 15 000 to 23 000 kilowatt-hours a year. A flat heated with gas uses 8 000 to 15 000. A home where gas serves only a hob uses 600 to 1 200. These brackets are wide because insulation, surface area and habits move them, which is why your own invoice beats any average.
Do I need my exact consumption to compare?
Yes, and it must come from your annual settlement invoice in kilowatt-hours rather than an approximate conversion from cubic metres. The conversion factor is specific to your grid and to the period, so doing it yourself introduces an error large enough to change the ranking between two close contracts.
Can I take a cheap tariff and manage everything on paper?
Often not. Several of the lowest tariffs are reserved for fully online management with electronic invoicing and direct debit. If you want a phone contact and a paper bill, the contract at the top of the ranking is simply not available to you, and the comparison starts one line lower.