Do you want to make an investment in renewable energy to reduce your energy bills by investing in solar panels or insulating your roof? Both projects are profitable over 20 years, but well-oriented solar panels are always more profitable.
Solar panels are profitable after 5 years in the Brussels region, after 7 years in Wallonia and after 16 years in Flanders, while the thermal insulation of the roof of your house is at best after 17 years in the Brussels region and after 20 years in Flanders and Wallonia.
Renewable energies to save money
There are many renewable energies to save energy today. Besides the fact that there is more and more global awareness towards the protection of the planet including the organization of COP21, it is also possible to make considerable savings and thus reduce your expenses.
There are different ways to reduce your energy bills. You can renovate your home so that it consumes less energy, or you can invest in sustainable or less energy-intensive sources such as solar panels. But which of the two is the most advantageous for an average family?
Ecological renovation of your home
An investment of around € 7,900 in roof insulation work (attic space) will reduce your energy bills by around 30% and will be profitable after 17 to 20 years, faster in Brussels thanks to subsidies.
The main energy expenditure of households is devoted to heating. Insulation is therefore the point to focus on when renovating your home. This will reduce your need for gas or electricity and reduce your bills. The roof is the main point of heat loss, leaving warm air to escape in winter and the outside heat to enter excessively in summer. The losses by the roof represent between 25 to 30% of total losses.
An average family of 3 in Belgium consumes on average 15,720 kWh 4 per year in heating and hot water. Investing in the thermal insulation of the roof of his house would allow this family to reduce by about 30% its energy consumption, less than 10,000 kWh per year. The cost of interior roof insulation and gyproc finish would be around € 7,900 (installation done by a professional) for a house with an average roof area of 88 m 2.
An investment of € 7,900 in such a project will only be profitable after 17 to 20 years. For an average family, the annual savings on the gas bill varies between € 292 and € 490 for the first 20 years taking into account the increase in the cost of energy, ie an average annual saving of € 383.
When is my investment profitable?
Since roof insulation subsidies vary by region, profitability also varies:
- In Brussels your investment is profitable after 17 years: The average premium is 20 € / m. The premium paid for the insulation of a roof of 88 m2 will then amount to € 1,755, making a great contribution to an ecological renovation project. The return on an investment of € 7,900 is around 1,11% over 20 years.
- Your investment is profitable after 20 years: You benefit from a premium of about 6 to 8 € per m2. For a roof of 88 m2 the amount of the premium will amount to 614 €. The return on an investment of € 7,900 is around 0.25% over 20 years.
- In Wallonia Your investment is profitable after 20 years: You benefit from a premium of € 5 / m2, the total amount of the premium being limited to the insulation of a maximum surface of 100 m². Thus, you can benefit from a premium of 439 €. The return on an investment of € 7,900 is around 0.13% over 20 years.
Invest in solar panels
An investment of € 8,000 in 100% efficient solar panels has an average yield of 4.4% over 20 years, the latest being higher in Brussels and Wallonia.
Solar panels are generally an excellent investment in the future. They allow you, after amortizing their costs, to benefit from free energy after deduction of certain regional taxes and not to be responsible for discharging into the environment.
Solar panels require a considerable initial investment. Thus, it is estimated the required investment for an average family of 3 consuming 3,500 kWh to 8000 € (cost of solar panels with a power of 4 kWp 9 to cover the consumption of 3,500kWh). By investing a sum of 8,000 € you will have yields and a return on investment different by region.