Best electricity supplier for a large family

When there are five or six of you at home, the electricity bill is no small detail: it can run into several thousand euros a year. And at that level of consumption, every cent per kWh changes everything. So which supplier should you pick for a large family, and how do you avoid paying more than you need to? Here is my comparison.

In short:

• A large family often consumes 6,000 to 8,000 kWh a year, double an average household: the kWh price weighs twice as much.
• Mega regularly comes out as the cheapest on variable rates, closely followed by Bolt and Luminus; Engie and Eneco play on range and services.
• Switching supplier can save 150 to 300 euros a year, sometimes more.
• A dual-hour rate becomes worthwhile if the family shifts washing, drying and charging to the night.
• Compare the total annual cost with your real consumption before signing.

For the full market picture, see our ranking of the best electricity suppliers.

Which electricity supplier should you pick for a large family?

For a large family, the best supplier is almost always the one with the lowest total annual cost, and Mega gets there most often. The Liège-based supplier, licensed by the CREG and the CWaPE, applies a tight kWh price that earns it good spots in the Test-Achats energy barometer, and that advantage multiplies on high consumption. But it is not alone: Bolt, the Belgian green-energy player, lines up very close variable rates; Luminus, the market number two, stays regularly competitive; Engie, the incumbent, reassures families that want a large network and a complete range; and Eneco relies on clear, often green-oriented offers. The right move for a household that consumes a lot is not to pick a brand on gut feeling, but to look at what a full year actually costs with each of them.

How much does a large family use, and why does the kWh price weigh double?

A family of four to five people consumes on average around 7,500 kWh of electricity a year, against 3,500 kWh for an average household — more than double. That figure rises further with electric heating, a water heater, a swimming pool, an electric car or simply teenagers plugged in around the clock. Mechanically, the more kWh you use, the wider the price gap between two suppliers becomes in euros. Concretely: a gap of 3 cents per kWh represents 105 euros over 3,500 kWh, but 225 euros over 7,500 kWh. That is the paradox of high consumption: the households with the most to gain from comparing are exactly the ones that often stay years with the same supplier out of habit. In the cases I review, that is almost always where the easiest saving is sleeping.

Which suppliers are cheapest for high consumption?

The cheapest suppliers for a large family are generally the same as for an average household, but the gap becomes far more visible. On variable rates, Mega, Bolt and Luminus lead the pack, while Engie and Eneco sit above on pure price but catch up on range and services. Here are the indicative benchmarks to keep in mind (mid-2026 readings, to be checked for your region and consumption):

These benchmarks do not replace a simulation: the ranking changes depending on whether you live in Wallonia, Brussels or Flanders, and on the day/night split of your consumption. For a family, a difference of a few places on pure price can represent more than 200 euros over the year.

Fixed or variable rate for a large family?

For most families, the variable contract stays the cheapest on average, but fixed holds up if the budget is tight. In 2026, variable offers come out roughly 15 to 20% cheaper than fixed ones for an average profile, a gap confirmed by comparators and by Test-Achats. On high consumption, that percentage translates into very real euros: several hundred euros of possible difference over the year. The flip side is exposure to rises: when markets go wild, a family on a variable rate sees its bill climb fast, precisely because it consumes a lot. That is why a large household with a budget planned down to the euro can legitimately prefer a one-to-three-year fixed contract: it pays a little more on average, but it locks a major line of its budget. Nobody predicts the markets — the choice depends first on your ability to absorb a bad year.

Is a dual-hour (off-peak) rate worth it for a family?

A dual-hour rate is worthwhile for a family provided you can shift a real share of your consumption to off-peak hours. The principle: the kWh is cheaper at night (generally 10 p.m. to 7 a.m.) and at weekends, and more expensive during the day. A large family precisely has power-hungry appliances it can schedule at night: washing machine, dryer, dishwasher, electric water heater, and above all charging an electric car, which on its own can justify dual-hour. Conversely, if your consumption is concentrated during the day — children at home, remote working, electric cooking at noon — with no way to shift it, dual-hour brings little, and can even cost more because of an often higher standing charge. First check the share of your consumption that is genuinely shiftable: that is what decides, not the principle. Most suppliers, including Mega, Luminus, Engie and Eneco, offer a dual-hour version of their plans.

How can you cut a large family's electricity bill further?

Beyond the supplier, a large family has several concrete levers to lighten the bill. The first is still to compare every year: a contract signed three years ago is very rarely still competitive, and switching to a new supplier is free, without any interruption and handled by the new operator, with one month's notice. Next, act on the big items: shift power-hungry appliances to off-peak hours if you are on dual-hour, replace an old freezer or dryer with an A-rated model, hunt down appliances on standby (a router, a console or an amplifier left plugged in permanently cost money every year). Finally, if your roof allows it, solar panels change the equation for a heavy consumer, because they pay off all the faster as consumption is high. Combined, these steps add to the saving from switching supplier, without taking anything away from the household's comfort.

In short, for a large family the point is not to find a magic brand but to make full use of the volume effect: over 7,500 kWh, the cheapest supplier — often Mega, Bolt or Luminus on variable rates — makes a real difference, while Engie and Eneco keep the edge on range and services. Before signing, always check your specific case on the CREG, VREG or CWaPE comparator, and compare the whole market in our ranking of electricity suppliers.