Engie or Luminus: which to choose?
Engie and Luminus are the two largest energy suppliers on the Belgian market. Both sell electricity and gas, on fixed and variable contracts, with renewable-origin offers. Neither is structurally cheaper: their relative position changes with the period and with the consumption profile.
| Provider | Plan | Price | Key points | View plan |
|---|---|---|---|---|
 Engie |
Dynamic | 14.14 c€/kWh |
| View plan |
 Luminus |
BasicFlex Online | 15.64 c€/kWh |
| 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.
Two comparable players on paper
Both cover the whole of Belgium and offer structurally similar ranges: fixed-price contracts over one to three years, indexed variable contracts, and offers labelled renewable through guarantees of origin.
Both also sell electricity and gas together, which allows a dual contract and, at both, a modest bundling advantage.
Consequently neither can be recommended in the abstract. What separates them at any given moment is the specific tariff card, and that changes several times a year.
The only calculation that separates them
Take your annual consumption in kilowatt-hours from your last settlement invoice. Multiply it by the energy price of each contract, then add the annual standing charge.
A standing charge weighs proportionally more the less you consume. Between two contracts whose unit prices are within a fraction of a cent, the standing charge decides — and it is the line least often compared.
Do this for electricity and gas separately. A supplier can be the better answer on one and the worse on the other, and there is no obligation to take both from the same house.
What to re-check at every renewal
A promotional price for new customers usually applies for a fixed period. What matters is the price applying after it, and whether the contract rolls over into a standard formula.
In Belgium every residential contract can be terminated on one month's notice without charge, whatever its stated duration. That protection makes re-comparing at every renewal both possible and worthwhile.
Guarantees of origin are regulated but very widespread on the Belgian market: they are not, on their own, a criterion that separates these two suppliers.
Our verdict
This question has no general answer: both revise their grids several times a year and their order reverses regularly. The method does not change: your annual consumption in kilowatt-hours times the price of each contract, plus its standing charge. Run that calculation on the table's offers at the date you sign — that is what decides, not reputation.
Frequently asked questions
Is Engie cheaper than Luminus?
Neither is structurally cheaper. Both revise their tariff cards several times a year and their relative order reverses regularly, so the answer depends on the date you sign and on your consumption profile rather than on the brand.
How do I compare two offers properly?
Take your annual consumption in kilowatt-hours from your last settlement invoice, multiply it by each contract's energy price, then add the annual standing charge. That total, not the unit price, is what separates two offers.
Must I take electricity and gas from the same supplier?
No. A supplier can be the better answer on one energy and the worse on the other. Compare each separately, then weigh whatever modest bundling advantage a dual contract offers against the difference you found.
Can I leave a fixed contract early?
Yes. In Belgium every residential energy contract can be terminated on one month's notice without charge, whatever its stated duration. That is what makes re-comparing at every renewal worth the effort.