Fixed or variable energy price in Belgium
A fixed-price contract freezes the energy rate for the contract term, protecting you from a rise and excluding you from a fall. A variable contract follows a market index revised monthly or quarterly, in both directions. In Belgium you can change your mind at any time with one month's notice, which makes the choice far less final than it looks.
As of August 31, 2026, the question is not which will cost less, since nobody can know, but how much variation your budget can absorb. If a sudden rise in your energy bill would create a cash-flow problem, a fixed price is justified even when it costs more on average. You are buying insurance, and insurance has a price.
| Provider | Plan | Price | Key points | View plan |
|---|---|---|---|---|
 BoltPartner |
Plenty Variable | 17.58 c€/kWh |
| View plan |
 MegaPartner |
Dynamic | 14.95 c€/kWh |
| View plan |
 Octa+Partner |
Dynamic | 14.57 c€/kWh |
| View plan |
EnergyVision |
Électricité bon marché 1800 kWh fixe | 10.60 c€/kWh |
| View plan |
 DATS 24 |
Électricité Verte Variable | 12.77 c€/kWh |
| View plan |
Ecofix |
Motion Online | 13.96 c€/kWh |
| View plan |
 Engie |
Dynamic | 14.14 c€/kWh |
| View plan |
 COCITER |
Électricité Variable | 15.01 c€/kWh |
| View plan |
 Luminus |
BasicFlex Online | 15.64 c€/kWh |
| View plan |
 TotalEnergies |
myEssential Variable | 16.66 c€/kWh |
| View plan |
 Eneco |
Soleil et Vent Flex | 17.03 c€/kWh |
| View plan |
 Elegant |
Elegant Électricité | On request |
| View plan |
Frank Energie |
Frank Elektriciteit | On request |
| View plan |
Ecopower |
Ecopower | On request |
| View plan |
Aspiravi Energy |
Aspiravi Energy | On request |
| View plan |
Wase Wind |
Wase Wind | On request |
| View plan |
Trevion |
Trevion | 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.
What each formula actually freezes
A fixed price locks the energy rate for the term. Only that component is frozen: network tariffs and regional taxes, which make up a large share of the invoice, keep moving independently. A fixed contract therefore does not mean a fixed bill, and this is the most common misunderstanding on the Belgian market.
A variable price is indexed to a wholesale market reference and recalculated each month or each quarter. The indexation formula is in the particular conditions of the contract and determines how quickly market movements reach your invoice.
In both cases the supplier adds a fixed margin. Two indexed contracts built on the same reference differ only by that margin and by the fixed annual fee, which makes them genuinely comparable once you have both documents.
The Belgian protection that changes the arbitration
A residential customer in Belgium can terminate an energy contract at any time with one month's notice and no indemnity, including a fixed contract sold for three years. The stated duration commits the supplier to its price; it does not commit you to stay.
The asymmetry runs in your favour. If market prices collapse while you are on a fixed contract, you can move to an indexed one within a month. If they spike while you are indexed, you can lock in, subject to the tariffs then on offer.
That protection considerably reduces the downside of choosing fixed, which is why it is a defensible default for a household that does not want to watch the energy market. It does not remove the need to check at each anniversary, since a tacit renewal rarely lands on the best tariff available.
Frequently asked questions
Does a three-year fixed contract really tie me in?
No. A Belgian residential customer can terminate an energy contract at any time with one month's notice and no penalty, whatever duration was announced. The term binds the supplier to hold its price for you; it does not oblige you to remain a customer for that period.
Does a fixed price protect me from every increase?
Only from a rise in the energy component. Distribution and transmission tariffs and regional taxes keep evolving and can push your bill up while you are on a fixed contract. This is a frequent source of confusion when a fixed-price customer receives a higher invoice than expected.
How do I compare two indexed contracts?
Look at two things: the market reference used for the indexation, and the margin the supplier adds on top of it. Two contracts indexed on the same reference differ only by that margin and the fixed annual fee. The full formula sits in the particular conditions, not in the advertising.
What happens when my fixed contract ends?
The supplier proposes a renewal, often at the tariff of the day, which can be materially different from what you signed. Tacit renewal frequently lands on less favourable conditions than a fresh subscription. Rerun the comparison at every anniversary rather than letting the contract roll over.