When considering your solar panel funding options for finance, it’s worth knowing the average cost of a solar panel installation varies according to the size and technology chosen for the installation. The average cost is often stated in €/Wp. In other words, in euros per watt-peak, the maximum amount that a solar panel can produce under optimum conditions. In 2024, we're talking about €1.3 / Wp to €2.5 / Wp with the installation included.
Based on an average of 3,500 kWh per year for a standard family and on the fact that a solar panel is never in optimal condition 100% of the time, we talk about a correction coefficient. Therefore, we would need a capacity of 4,100 Wp for this standard family.
Assuming an average price of €2/Wp, this gives an annual budget of around €8,200. Bear in mind that this is, of course, a very rough calculation and that each situation is different (terraced house, underfloor heating, insulation, desire to install batteries, etc.).
Be that as it may, although the total cost of a photovoltaic installation has fallen in recent years, it still represents a substantial budget that many Belgians prefer to spread out over time through a loan. The several ways to do this are described below.
Depending on the region you live in, there are different regulations that can facilitate the installation of your panels. We're not talking here about grants and benefits that no longer exist in Wallonia or Flanders (but still exist in Brussels in the form of municipal grants or green certificates), but about zero-interest financing solutions.
In Wallonia, there is a 0% interest rate available with the Rénoprêt, but this is subject to a means test and the age of the house (at least 15 years old). What's more, this option comes with a maximum loan limit of €60,000 which includes other work (so, for example, if you want to buy a house to renovate and are planning to carry out €100,000 of work, including your solar panels, the zero-rate can only cover part of the work if you meet the required conditions).
In Flanders, there is the MijnVerbouwLening scheme, which offers the same kind of possibilities with the same type of conditions and amount (age of the building, means test, etc.). However, since February 2024, this loan is now subject to an interest rate of 2.75% and this rate will be increased to the level of the legal interest rate of 5.75% in the spring of 2025. However, it is important to check the conditions in detail on the websites of the various regions.
In Brussels, there is the Ecoreno loan (which can be either a consumer loan or a mortgage), which is also available subject to conditions. Depending on your income, you may or may not be eligible for the loan but if you are the rate applied will also depend on your income (1.5% or 2.5%).
"}},{"componentType":"sectionTitle","title":"What loan for solar panels?"},{"componentType":"paragraph","richBody":{"value":"There are a number of solutions on offer from the regions. However, depending on your project, they can be quite restrictive. For example, if your house is less than 15 years old and you want to install solar panels to keep up with rising energy prices, this will not be possible in Wallonia or Flanders. Similarly, if your income is too high, you won't be able to use these options either. However, if you are embarking on a large-scale renovation of an old home, for example, you might quickly reach the loan ceiling and need other financing solutions.
The article Energy retrofit, save energy! explains in more detail the return you can expect from your solar panels.
Fortunately, there are other interesting options offered by the various lending institutions in Belgium. The energy loan, which is an instalment loan to finance work to improve the energy efficiency of your home, enables you to pay less interest than a conventional renovation loan as long as 75% of the work is for an energy retrofit (this includes solar panels).
If you're interested in taking out such a loan, don't hesitate to use our energy loan simulation tool to get an idea of the possibilities available.
"}},{"componentType":"sectionTitle","title":"Also consider!"},{"cards":[{"cardSize":"small","cardType":"product","componentType":"productCard","image":{"extension":"jpg","original":"https://assets.ing.com/m/6cae176aa2d05bb0/original/A-smiling-young-woman-stands-on-a-ladder-beneath-the-doorframe-holding-out-blue-cables-to-the-camera.jpg","transformBaseUrl":"https://assets.ing.com/transform/a8e158f4-4dcd-48b3-8e6d-964f0c4c0f66/A-smiling-young-woman-stands-on-a-ladder-beneath-the-doorframe-holding-out-blue-cables-to-the-camera","type":"image","width":8268},"intro":"Reduced-rate installment loan when at least 75% of your renovation are aimed at saving energy.","link":{"url":"/en/individuals/borrowing/energy-loan-renovation"},"title":"Energy loan for renovations"},{"cardSize":"small","cardType":"product","componentType":"productCard","image":{"altTextFR":"Couple peignant et rénovant leur maison ensemble","extension":"jpg","original":"https://assets.ing.com/m/7cf7d65750c1806e/original/Couple-painting-and-renovating-their-house-together.jpg","transformBaseUrl":"https://assets.ing.com/transform/46197e57-7fc2-4813-98c3-73f46b0f9c72/Couple-painting-and-renovating-their-house-together","type":"image","width":4096},"intro":"Have you just bought a property to renovate and can’t get your head around home improvement loans or grants? Check out what’s available.","link":{"url":"/en/individuals/borrowing/home/home-improvement-loan"},"title":"What type of home improvement loans are best for a home renovation?"},{"body":"Would you like to help the environment and your wallet at the same time? Find out how.","cardSize":"medium","cardType":"article","componentType":"articleCard","date":"2026-05-18","image":{"extension":"jpg","original":"https://assets.ing.com/m/4a799e95fea19d92/original/ecological-renovation-1920.jpg","transformBaseUrl":"https://assets.ing.com/transform/edf136b7-aef8-4537-a162-0d693c761b47/ecological-renovation-1920","type":"image","width":1920},"link":{"url":"/en/individuals/my-life/housing/ecological-renovation-steps"},"title":"Renovating your house ecologically"}],"componentType":"cards"}]},"hasMacro":false,"id":"42c8e3e8-33c8-48af-bb2b-d5d765b3e9c8","legalZone":{"flexComponents":[{"componentType":"sectionTitle","title":"Legal notes"},{"componentType":"paragraph","richBody":{"value":"The amount that you are likely to be able to borrow, as stated in the advertising message, is communicated for information purposes only. Neither the granting of the loan nor the aforementioned amount are guaranteed by ING Belgium. To determine the amount thus simulated, we took into account a set of data currently known to ING, in particular: your financial situation (i.e. your income and any extra-legal benefits as well as your expenses on your ING accounts as well as your savings, loans and investments with ING), your personal and family situation known to ING (in particular, your age, your personal status, your dependents) and the fact of exercise an independent activity. On the other hand, it is not required to provide the following information (which will be requested and/or verified in the event of a credit application on your part), in particular: your professional situation, the type of residence you occupy, other expenses or income not known to ING or futures, your savings and investments with ING, as well as credit data with third parties consulted with the National Bank of Belgium.
This advertising message, which concerns an installment loan for private purposes subject to consumer credit legislation, does not constitute an offer of credit. It is intended exclusively for natural persons of legal age and any request for credit is made subject to prior acceptance of your file by ING Belgium and mutual agreement. The general conditions and rates for this loan are available from all ING branches and can be consulted on www.ing.be (section 'Rates and regulations'). Your request and the possible approval of your request by ING (after examination of your file by ING) in a branch or through the 'Consumer Loans Online' service on www.ing.be, do not commit either ING or yourself, as long as you have not signed a credit agreement at your ING branch or, in the case of an online request, as long as you have not returned the signed credit agreement (after prior approval of your file by ING) to ING, where it is checked beforehand whether the data provided in the request are accurate and complete (among other things, on the basis of the documents submitted or to be submitted).
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