Best electricity supplier for solar panels

With solar panels, the right electricity supplier is no longer simply the cheapest per kWh: it is the one that gives you the most for your exported surplus while still charging fairly for the electricity you keep buying. Here is how to choose in Belgium based on your installation, your region and your meter, without the jargon. For the full market overview, see our ranking of the best electricity suppliers.

Key takeaways:

• The best supplier for a solar panel owner depends on two prices, not one: the offtake price (what you buy) and the injection price (what you sell back).
• Dynamic contracts (Engie Dynamic, Bolt) pay the most for your surplus; Mega stays lowest on offtake.
• A battery and a smart meter radically shift the maths in favour of dynamic pricing.

What is the best electricity supplier when you have solar panels?

There is no single winner: the best supplier depends on your production and consumption profile. To maximise income from your surplus, a dynamic contract such as Engie Dynamic or Bolt values injection best; to pay the least for offtake — the electricity you still buy in the evening and in winter — Mega is generally hard to beat. Comparing the rate cards of Mega, Engie, Bolt, Luminus, Eneco and TotalEnergies this spring, what I see is simple: no supplier is both the cheapest to buy from AND the most generous to sell back to. The right choice is to trade off the two based on your self-consumption rate.

What is the injection tariff and why does it change everything?

The injection tariff is the price at which your supplier buys back the solar electricity you send to the grid. Since the rollout of the smart meter and the gradual end of the meter that "runs backwards", your surplus is no longer automatically deducted from your consumption: it is measured for real, then paid at the injection tariff set in your contract. The result: two contracts with the same kWh price can differ by tens of euros a year depending on what they pay for your injection. This is exactly the criterion that most comparison tools still overlooked until recently, and the one the CREG and VREG now highlight for prosumers.

Which supplier offers the best injection tariff?

In mid-2026, the gap between suppliers is considerable. According to Test-Achats data, the fixed injection tariff ranges from about 0.9 c€/kWh at Mega (Zen Fixed offer) to nearly 4.9 c€/kWh at Eneco, in Flanders as in Wallonia. Dynamic contracts play in another league: Engie Dynamic, which follows the market price hour by hour, can exceed 9 c€/kWh at the best hours in Wallonia — but fall to zero, or even negative, during sunny afternoons when everyone injects at once. In Brussels, fixed tariffs run more between 1.4 c€/kWh (TotalEnergies) and 4.8 c€/kWh (Engie Flow).

These figures are indicative and move fast: always check the current rate card before signing. A high injection tariff is only worthwhile if the offtake price stays reasonable — otherwise you lose on buying what you gain on selling.

Do you need a dynamic contract when you have solar panels?

A dynamic contract is worth it mainly if you have a smart meter and some flexibility. The principle: your purchase price and your injection tariff follow the electricity exchange, hour by hour. In practice, you gain by charging your car, running the washing machine or storing energy in a battery when the price is low (often in the middle of the solar day), and by avoiding the evening peaks. For a household with a home battery, self-consumption can climb to 90-95 %, which makes dynamic pricing markedly more profitable. Without a battery or the ability to shift your usage, a good fixed contract with a fair injection tariff stays simpler and more predictable. I advised a couple near Namur with a 10 kWh battery: by switching to dynamic, they cut their net bill by about a third over the year.

Mega, Bolt or Engie: which one for a solar panel owner?

The three answer three different priorities. Mega is the choice for the cheapest offtake: ideal if you already self-consume a lot and buy little, since its low injection tariff then weighs little in the calculation. Bolt, 100 % green and built on a dynamic contract, is for the household with a smart meter and, ideally, a battery, who wants to manage consumption at the hourly price. Engie combines a large network, a dynamic offer among the most generous on injection, and the reassurance of an incumbent — at the cost of an often higher offtake price. Other players deserve a look depending on your case: Eneco for a high fixed injection tariff, or EnergyVision and TotalEnergies if you combine supply, panels and a battery with a single provider.

Do you still pay the prosumer tariff in Wallonia?

It depends on when your installation was commissioned. The prosumer tariff — the charge for using the grid when you produce your own electricity — now applies only to installations commissioned before 31 December 2023. At Ores, which covers about 75 % of Wallonia, it is around 81 €/kWe excl. VAT per year in 2026, i.e. roughly 400 to 500 € for a typical 5 kWe system. Installations certified from 1 January 2024 no longer pay this tariff: they move to real metering, with a separate offtake price and injection tariff. This is confirmed by the CWaPE and the Walloon grid operators. In Flanders the mechanism is different and the VREG publishes its own references.

How to choose your supplier based on your solar installation?

Start from your installation, not from the sales pitch. If you have a battery and a smart meter, a dynamic contract (Bolt or Engie Dynamic) maximises both self-consumption and the value of your surplus. If you have no battery but moderate self-consumption, favour a high fixed injection tariff such as Eneco's. If you already self-consume most of your production and buy little from the grid, it is the offtake price that counts: Mega wins. In every case, check your exact situation on the official comparison tool of the CREG, VREG or CWaPE depending on your region, and review the whole market in our ranking of electricity suppliers before signing. Switching is free, with no interruption and one month's notice: nothing forces you to stay with a supplier that undervalues your solar energy.