Solar Incentives in Belgium

The Flemish thuisbatterij (home battery) premium supports the addition of stationary battery storage to residential solar PV systems. The premium has been progressively reduced — peaking at €1,725 in 2020 and declining each year. As of 2026, the ceiling is approximately €725. Applications run through the Mijn Energie online portal at vlaanderen.be; the digital meter must be installed and active before the application is filed. The premium applies to lithium-based batteries (LFP, NMC) ≥ 1 kWh capacity, certified to IEC 62619 or equivalent. Lead-acid systems are not eligible. Combining with EPC-related home renovation premiums is permitted. Applications must be submitted within 9 months of installation. Verify the current premium tier at the Vlaanderen energy portal — the rate has been on a downward trajectory and may be at a lower level by the time of installation.

Wallonia (the French-speaking southern region) operates separate energy incentives from Flanders. Historically the Région wallonne supported residential battery installations through its Primes Énergie programme, with amounts varying year-to-year. In 2025 the Walloon government restructured several regional energy programmes, and battery-specific premiums were folded into broader renovation incentives in some districts. Walloon homeowners should consult energie.wallonie.be for the current premium structure or contact a Guichet de l'Énergie advisor. The Walloon tariff and metering structure differs from Flanders: Wallonia retained net-metering for some prosumer categories longer, but is also transitioning toward digital metering and prosumer-tariff models. The economics of battery storage in Wallonia depend heavily on the tariff regime applicable to the household.

The Brussels-Capital Region operates a Certificats Verts (Green Certificates) scheme for solar PV. Each certificate represents one MWh of solar electricity generated. The system is paid based on actual production, not on grid export, so high self-consumption does not reduce certificate income. Certificates are valid for 10 years from system commissioning. They are sold to electricity suppliers (who are obligated to surrender certificates as part of regional renewable obligations) at market price, with a regulated floor of €65. Brussels Environment (Bruxelles Environnement) administers the scheme. Coefficient multipliers historically applied (e.g., 2.5x for systems ≤ 5 kWp) to encourage residential adoption have been progressively reduced. As of 2026, the residential coefficient is typically around 2.0x — meaning a 5 MWh/year system earns ~10 certificates, worth ~€820/year. The certificate scheme combines with the federal VAT-reduced rate on residential PV equipment.

Belgium applies a reduced 6% VAT rate to renovation work, including solar PV installation, on residential dwellings at least 10 years old (Royal Decree 20, Annex G). The rate covers both equipment and installation labour when invoiced as a single bundled service by a registered installer. Standalone equipment purchases without installation, and installations on dwellings less than 10 years old, are subject to standard 21% VAT. Battery storage systems supplied as part of the installation also qualify for the 6% rate when contracted alongside PV. The reduced rate applies federally across all three regions (Flanders, Wallonia, Brussels). New-construction projects (less than 10 years old) cannot use this rate but are usually subject to other reduced rates under demolition-and-reconstruction provisions in eligible urban areas.