With rising electricity prices and the push for an energy transition, more and more Belgian households are turning to solar. But one question keeps coming up: how much can you actually save with solar panels in Belgium? Here’s a clear, data-backed analysis tailored to the Belgian reality.

1. An electricity bill (almost) cut in half.

With the installation of solar panels, an average household can reduce up to 60 to 80% of its annual electricity consumption. This depends on several factors:

• Size of the solar installation
• Self-consumption rate
•  Energy usage habits (day vs. night consumption)

Concrete example:

With a consumption of 4,000 kWh/year, and an installation producing 3,500 kWh/year, the electricity bill could be reduced by €900 to €1,200 (depending on rates).

2. What is the average cost of a solar installation in Belgium?

In 2025, the price of a residential photovoltaic system (including inverter and installation) is around €1,200 per installed kWp, with a total investment between €5,000 and €8,000 depending on:

•  Panel power (monocrystalline, bifacial, etc.)
•  Inverter type (hybrid, string, micro-inverter)
•  Installation complexity

3. Return on investment (ROI)

Thanks to lower energy bills, the average ROI is between 5 and 9 years. Over 25 years, a well-installed system of 3.5 kWp can save over €12,000 in electricity costs.

➡️ Example: A €6,000 system saves about €530/year, excluding rising energy prices.

4. Incentives, subsidies and reduced VAT

In Belgium, several advantages make solar even more attractive:

• 6% VAT for homes older than 10 years
• Regional grants (depending on the region, municipality or power capacity)
• Green certificates (Wallonia only) and financial bonuses for smart inverters and storage (Flanders) ​

5. An ecological and sustainable approach

By producing green electricity, solar panels significantly reduce your carbon footprint. For a 3.5 kWp system, this means saving more than 1,200 kg of CO₂ per year, equivalent to driving 8,000 km in a petrol car or avoiding a full year of electric heating.