Solar panel payback in France in 2026
What makes a system pay off now that the premium is gone, worked out scenario by scenario, and the point where it stops paying off.
A home solar system in France now pays for itself through the electricity it saves you from buying, far more than through selling surplus. In Paris, 3 kWp facing due south for a household using 4,500 kWh a year earns €329 in year one and pays back in 18.0 years if the installed price is €6,000, an estimate drawn from recent quotes. The same roof for a household using 8,000 kWh pays back in 12.6 years; for one using 2,500 kWh, in over 20 years. Going up to 6 kWp without using more power makes things worse: over 20 years. The quote price matters as much as the sunshine: at €5,000 instead of €6,000, payback drops to 15.1 years. Finally, any future rise in electricity prices shortens the wait; the calculator assumes no rise by default and lets you pick your own assumption.
How many years until your panels pay for themselves?
Pays for itself in
18.0 years
| Output per year | 3,395 kWh |
| Gain in year 1 | €329 |
| Installed price (estimate) | €6,000 |
| Net over 20 years | +€665 |
Département median, roof at 30° due south, surplus sold at 1.1 c€/kWh.
Checked by Radif Partners · Editorial policy · Method and sources
Nine scenarios, one setting changed each time
To see what really matters, we start from a base case in Paris (3 kWp, roof at 30° due south, a household using 4,500 kWh with no electric heating, estimated installed price) and change a single setting per row. Paris sunshine is close to the French median: in Lille or Marseille, every payback time shifts in the same direction.
| Scenario (Paris) | Year-1 gain | Pays back in | 20-year result |
|---|---|---|---|
| Base case: 3 kWp, 4,500 kWh, due south | €329 | 18.0 years | +€665 |
| Usage of 2,500 kWh | €220 | over 20 years | -€1,491 |
| Usage of 8,000 kWh | €476 | 12.6 years | +€3,570 |
| East-facing roof | €305 | 19.5 years | +€164 |
| 6 kWp instead of 3 | €417 | over 20 years | -€1,429 |
| Surplus not sold | €321 | 18.7 years | +€423 |
| kWh price +2% a year | €329 | 15.6 years | +€2,045 |
| kWh price +4% a year | €329 | 14.0 years | +€3,805 |
| Quote at €5,000 | €329 | 15.1 years | +€1,665 |
Three levers dominate: how much power you use while the panels produce, the system size relative to that usage, and the price paid. Orientation matters less than people think: an east-facing roof loses some output, but payback only lengthens by a few years (19.5 years against 18.0 years).
Why the economics changed in 2026
Until 4 June 2026, the investment premium cut the price paid up front and surplus sold at 4 c€/kWh. Since 5 June 2026, there is no premium and surplus is worth 1.1 c€ (feed-in tariff details). Every kWh used at home, on the other hand, avoids 20.01 c€ of purchases on EDF’s regulated Tarif Bleu. The return therefore rests on the self-consumption rate, which the regulator found between 30 and 65% for 69 % of small systems (CRE deliberation 2025-69).
How much of your output will you use yourself?
Self-consumption rate
46 %
| Used on site | 1,620 kWh |
| Exported to the grid | 1,909 kWh |
| Share of the bill covered | 36 % |
| Saving in year 1 | €324 |
Median French output (1,185 kWh/kWp), roof at 30° due south, hour-by-hour calculation.
What “pays back in” does not tell you
The figure shown is the year in which cumulative gains exceed the price paid, without discounting: a euro earned in fifteen years counts as much as one today. It deducts neither module ageing, nor an inverter replacement, nor any maintenance, and it assumes your usage stays the same. These are reasons to keep a margin: a system shown paying back in nineteen years has almost none.
Conversely, the 20-year result counts nothing after the purchase contract ends, although panels usually keep producing. The two simplifications partly offset each other; the method sets them out.
How to improve your project’s return
- Size on daytime usage, not on roof area: the calculator shows the best-value size.
- Get several quotes: the installed price is the easiest parameter to move.
- Check eligibility for 5.5% VAT at 9 kWp or less.
- Shift programmable loads (washing machine, water heater, car charging) to the middle of the day.