With the steady increase in electricity prices over recent years, many households are looking for concrete ways to reduce their expenses. Solar energy naturally stands out as an attractive option, but one question keeps coming up: is it really worth it, and more importantly, how much can you actually save?
In practice, there isn’t a single answer. Savings depend on several factors, but some general benchmarks already give a fairly clear idea.
Why does solar energy lead to savings?
The principle is simple. By producing part of your own electricity, you automatically reduce what you buy from your supplier. In the case of solar energy, every kilowatt-hour you produce and consume yourself is a kilowatt-hour you don’t have to pay for. This is known as self-consumption, and it is currently the most common setup.
In some cases, the electricity you don’t use can be fed back into the grid. It can then be sold, although typically at a lower rate than the price you pay for electricity.
How much can you really save?
For a traditional rooftop solar installation, we can provide some fairly reliable estimates.
Today, electricity prices generally range between €0.20 and €0.25 per kWh. A system of 3 to 9 kWp typically produces between 3,000 and 10,000 kWh per year, depending on location, roof orientation, and installed capacity.
In practice, this often translates to:
- around €600 – €1,200 in annual savings for a 3 kWp system
- between €1,200 and €2,500 or more for a 6 to 9 kWp system
These are averages. Actual savings can vary significantly depending on your consumption and your ability to use electricity when it is produced.
A matter of timing more than production
You might think that producing more electricity automatically leads to higher savings. In reality, it’s not that simple.
The most important factor is your ability to consume electricity at the moment it is produced. If you are at home during the day, or if your home has continuous consumption (fridge, internet router, standby devices), a large portion of the production will be used directly.
On the other hand, if you are rarely home during the day, more electricity will be fed back into the grid, slightly reducing your direct savings.
How to estimate your own savings?
There is a simple formula for a first estimate:
Annual savings = production × self-consumption rate × price per kWh
Example:
A 6 kWp system producing around 6,000 kWh per year, with a self-consumption rate of 70% and an electricity price of €0.22/kWh, results in savings of about €900 per year.
This type of calculation doesn’t replace a detailed study, but it gives a good indication.
What budget should you expect?
Cost is, of course, a key factor.
For a rooftop installation, typical price ranges are:
- €6,000 – €12,000 for 3–6 kWp
- €12,000 – €18,000 for 6–9 kWp
These amounts usually include installation, but can vary depending on roof configuration, equipment, and available incentives.
What about excess energy?
When your system produces more than you consume, the surplus can be fed into the grid.
In most cases, this excess electricity can be sold at a regulated rate. It’s not the main source of return, but it slightly improves the overall profitability of the project.
How long does it take to pay back?
This is often the most important question.
In most cases, a rooftop solar installation pays for itself within 8 to 12 years. This depends on the initial cost, annual savings, and the evolution of electricity prices.
The factors that really make a difference
Several elements have a strong impact on profitability:
- solar irradiation in your area
- roof orientation and tilt
- your daytime consumption
- electricity prices
These factors explain why two similar installations can generate different results.
Can you become fully autonomous?
In most cases, no. The goal of solar energy is not necessarily full independence, but rather to significantly reduce reliance on the grid.
Even a partial reduction in your electricity bill can already represent meaningful long-term savings.
In summary
Solar energy makes it possible to reduce your electricity bill in a concrete way, provided the system is properly sized and adapted to your consumption.
Savings are not fixed, but they are generally predictable. And in a context of rising energy prices, they tend to become increasingly attractive over time.
Before investing, it is therefore essential to carefully assess your project to ensure it truly matches your needs.
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