Is a home battery worth it for you in Flanders?

A home battery stores the solar power you do not use straight away, so you can use it later, for example in the evening. Many people with solar panels are now getting offers for one. Whether it makes sense depends on your own meter, your own habits and your own contract, not on a general sales figure. This article helps you look at those first.

Why the question changed

For years, many solar households in Flanders had an old meter that ran backwards when the panels produced more than the house used. That system is over. Owners of solar panels have had to get a digital meter since 2025, and from 1 April 2026 a surplus built up on the old meter is no longer compensated when the digital meter arrives (Fluvius). If you still have the old meter with solar panels, you pay the yearly prosumer tariff, a fixed network charge based on the power of your inverter (the box that converts your panels' power for the house) (Vlaamse Nutsregulator).

With a digital meter, the power you send to the grid and the power you take from it are counted separately. The power you send out is paid by your supplier under an injection contract.

Using your own power is worth more than selling it

The regulator's price report for 2025 says a typical Flemish household with solar panels saved on average €469 that year by using its own solar power, and received on average €107 for the power it sent to the grid (Vlaamse Nutsregulator, price report 2025). These are averages, not a promise for your home. The same report warns that on some variable injection contracts, if the price formula turns negative for a whole month or quarter, you pay for the power you send out.

A battery is one way to use more of your own power. It is not the only one: running the washing machine, dishwasher or car charger around midday, when the panels produce most, is free and often a good first step (Vlaamse Nutsregulator).

The capacity tariff: a battery helps only above the minimum

Part of your network charge depends on your highest quarter-hour of power use each month. We explain this in our article on the capacity tariff and your monthly peak. A battery can lower that peak by supplying power when several appliances run together. But everyone pays at least the 2.5 kW minimum anyway, so if your peaks are already close to it, a battery cannot lower that part of the bill.

No Flemish battery premium

The Flemish home battery premium has ended: the official application office on energiesparen.be states that it is closed (Energiesparen). Home batteries are also not on the list of works covered by Mijn VerbouwPremie, the main Flemish renovation premium (Vlaanderen.be). Be careful with offers that still mention a regional premium; ask the seller to show the exact rule in writing.

Check this yourself

• Your meter: is it digital? If you still have the old one with solar panels, sort that out first.
• Your data: in Mijn Fluvius you can see how much you take from the grid and how much you send to it, per month and per quarter-hour.
• Your monthly peaks: how far are they above 2.5 kW, and when do they happen?
• Your injection contract: fixed or variable price, and what happens when prices are negative?
• Your habits: which large appliances could simply run at midday?

Before you decide

Ask any seller for a calculation based on your own Fluvius data, not on an average household, and ask what happens if prices or tariffs change. Fluvius mentions 1 to 1.5 kWh of battery per kWp of solar panels as a common size, which is a rough guide, not a target (Fluvius). Fluvius also says that a home battery must be registered with them, with a valid electrical inspection (AREI) and a simple wiring plan. Ask who takes care of that. The installation itself is work for a qualified installer.

Sometimes the honest answer is that changing a few habits does more than a battery. Sometimes a battery fits well. Want an independent look at your meter data and equipment before a salesperson comes? Tell us about your home.