Photovoltaic panels in France: what holds true in 2026
A photovoltaic panel turns light into electricity. Here are the figures that matter this year, and what to make of the claims heard most often.
Photovoltaic panels generate electricity from light, unlike solar thermal panels, which heat water. Their direct current goes through an inverter that converts it to alternating current for the house; whatever is not used on site flows to the grid. In 2026 the economics in France changed: for connection requests filed from 5 June 2026, surplus is paid only 1.1 c€/kWh and the investment premium has gone, while a kWh bought at the regulated Tarif Bleu costs 20.01 c€. A system’s value therefore depends almost entirely on the share of output used on site. One kWp produces a median 1,185 kWh a year in France according to PVGIS. For a 4,500 kWh Paris household, 3 kWp pays back in 18.0 years at an estimated installed price of €6,000; in Lille, in 18.8 years. Common beliefs about the north, size and facing are checked below, with figures.
What does a system of this size cost?
Installed price incl. VAT (estimate)
€6,000
| Per watt-peak | 2.00 €/Wc |
| Year-1 gain (Paris, 4,500 kWh) | €329 |
| Self-consumption premium | Abolished since 5 June 2026 |
Quote benchmarks from September 2025 to February 2026, not an official price: your quote comes first.
Checked by Radif Partners · Editorial policy · Method and sources
The six figures for 2026
| 2026 benchmark | Value | Source |
|---|---|---|
| Median output of one kWp | 1,185 kWh/yr | PVGIS |
| Surplus feed-in tariff | 1.1 c€/kWh | order of 1 June 2026 |
| Price of a bought kWh (Tarif Bleu base) | 20.01 c€ | CRE |
| Installed price of 3 kWp (estimate) | €6,000 | collected quotes |
| Reduced VAT, with conditions | 5.5 % up to 9 kWc | order of 8 September 2025 |
| Self-consumption premium | abolished | order of 1 June 2026 |
The ratio between the two kWh prices says it all: a kWh used on site is worth 18 times a kWh sold. Details are on the feed-in tariff, price and grants pages.
Six common beliefs, checked by calculation
“It is not worth it in the north.” False for a household that uses power: in Lille, 3 kWp pays back in 18.8 years, against 14.9 years in Marseille. The gap is real, but household usage matters more (output by region).
“The bigger the system, the more it earns.” False since the tariff cut: for the same Paris household, 6 kWp gives a 20-year result of -€1,429, against €665 for 3 kWp (6 kWp).
“Without a south roof, don’t bother.” False: facing due east, payback goes from 18.0 years to 19.5 years, because self-consumption rises (facing).
“The premium pays for a good part of the system.” Not any more: it was abolished for requests filed since 5 June 2026 (self-consumption premium).
“You must sell your surplus.” Not necessarily: without sales, the Paris case’s 20-year result is €423, against €665 with sales. The difference is small.
“A battery makes the system pay.” Rarely: it raises self-consumption but its price often exceeds the saving (battery).
How much does selling your surplus earn?
Income in year 1
€20
| Over 20 years (indexed 2%/yr) | €481 |
| Cap on paid energy | 4,800 kWh |
| With the old tariff (4 c€) + premium | €1,680 |
Tariff of 1.1 c€/kWh for complete grid-connection requests filed since 5 June 2026.
How a system works
The modules, wired in series or each linked to a micro-inverter, produce direct current. The inverter converts it to alternating current, used first by appliances running in the house; the rest goes through the meter to the grid. The smart meter (Linky) records separately what you buy and what you export, which is how sold surplus gets paid.
Lifespan and upkeep
A module has no moving parts: it wears slowly, and manufacturers often guarantee a minimum output for 25 years or more. The central inverter is the part that fails first, often between 10 and 15 years; micro-inverters usually carry a longer warranty. Allow for that replacement in your budget, even though our twenty-year calculation does not include it. On a pitched roof, rain is usually enough to clean the modules; washing with clean water, without detergent or a pressure washer, is only worth it if dirt is visible, for instance near a field or a tree. Tracking output in the inverter’s app remains the best way to spot a fault.