- The cheapest gas supplier in Belgium in June 2026 is Ecofix (~€1,637/year for 17,000 kWh).
- Luminus is among the most expensive (~€1,900/year): the annual gap exceeds €250.
- In Brussels, the residential gas market is more limited (ENGIE, TotalEnergies, Luminus, Bolt).
- Switching gas supplier is free, with a one-month notice and no outage.
What to check before signing
Gas is the heaviest item in a gas-heated home (~17,000 kWh/year). A few parameters make all the difference.
As with electricity, compare the full annual cost: price per kWh + fixed fee. A slightly lower kWh paired with a €90/year subscription is not always a good deal.
The fixed-vs-variable choice is decisive here: gas is more volatile than electricity. A fixed rate protects against a spike (like the one in April 2026) but includes a risk premium.
Check availability in your region: some suppliers do not cover Brussels for residential customers.
If you fear price rises, a 1-to-2-year fixed contract locks your heating budget.
Our picks by profile
For a typical household of 17,000 kWh/year, here is what stands out in June 2026.
| Profile | Plan | Annual cost | Why |
|---|---|---|---|
| Tight budget | Ecofix — Flexy Online | ~€1,637/yr | The cheapest gas on the market in June 2026, variable, fully online. |
| Stable price | Mega — Smart Fixed | ~€1,673/yr | Price locked for 2 years, a Belgian supplier — ideal to secure your budget. |
| Reliable nationwide | ENGIE — Basic Variable | ~€1,676/yr | Incumbent supplier, national coverage and an extensive service network. |
Frequently asked questions
Which is the cheapest gas supplier in Belgium?
In June 2026, Ecofix offers the lowest rate (~€1,637/year for 17,000 kWh). Variable prices change monthly: check the current offer before subscribing.
Should I use the same supplier for gas and electricity?
A dual-fuel deal simplifies management and sometimes gives a discount, but it is not always the cheapest. Compare the gas + electricity total rather than each energy separately.
Fixed or variable gas rate?
Gas is volatile. Fixed protects against a price spike for 1 to 2 years for a premium; variable follows the market and is often cheaper outside tense periods.
Does switching gas supplier cut my supply?
No. Your connection is never cut when switching, there is no termination fee, and the new supplier handles the paperwork.