Solar PV in Luxembourg, municipality by municipality › Calculator
Calculator · two free tools, no sign-up
Tool 1: how much your roof would produce and earn each year. Tool 2: how many years until the system pays for itself, with the 2026 Klimabonus or with the 15-year guaranteed feed-in tariff, and which of the two suits you. Everything is computed in your browser from official sources: yield from PVGIS, subsidies from guichet.lu, ILR grid tariffs, the grand-ducal regulation on feed-in tariffs. Benchmark: 37,978 installations are already connected in Luxembourg (19 October 2026).
Describe your roof and your consumption: the yield comes from the PVGIS database of the European Commission's Joint Research Centre (SARAH3 irradiation, 2005-2023, 14% system losses), computed for Luxembourg City and corrected by canton. The self-consumed share is estimated from the production/consumption ratio; you can override it.
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The tool takes the production from tool 1 and compares the two schemes open to households in 2026: option A, Klimabonus (deducted from the invoice) with self-consumption and surplus sold at market price; option B, no subsidy but surplus paid at the guaranteed feed-in tariff for 15 years. The two cannot be combined: claiming the Klimabonus means waiving the guaranteed tariff.
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kWh per kWp per year in Luxembourg City, PVGIS SARAH3 2005-2023, 14% system losses. The optimum is due south at 35°; an east-west roof produces about 20% less, a vertical façade 30 to 50% less.
Factors by canton (south-facing, 35°): .
Variable components of a household bill (category A, under 25,000 kWh/year), tariffs in force on 1 August 2026. The compensation mechanism is negative in 2026 because the State pays €150 million into it; the law provides for this in 2026 only.
| Component | 2026, with contribution | without contribution |
|---|---|---|
| Energy (typical residential offer) | 13.2 c€ | 13.2 c€ |
| Grid, volumetric charge (ILR) | 5.10 c€ | 5.10 c€ |
| Compensation mechanism, cat. A | −3.71 c€ | −0.10 c€ |
| Electricity tax, cat. A | 0.10 c€ | 0.10 c€ |
| VAT 8% | 1.18 c€ | 1.46 c€ |
| Total per kWh | 15.9 c€ | 19.8 c€ |
Klimabonus (guichet.lu): P × (1,155 − 33 × P) € for a power P below 15 kWp, €10,000 from 15 kWp; battery Q × (500 − 500/18 × Q) €, €2,250 from 9 kWh. Guaranteed tariff (amended grand-ducal regulation of 1 August 2014, art. 17ter): 165 × 0.97n−2019 €/MWh up to 10 kW, 155 × 0.97n−2019 above that and up to 30 kW, n being the year of first feed-in.
About 1,070 kWh a year for a due-south roof pitched at 35° in Luxembourg City (PVGIS, 2005-2023 average, 14% system losses), 1,010 kWh for a south-east or south-west roof, 860 kWh for an east or west roof. The north of the country (Clervaux, Wiltz) produces 3% less, the south (Esch, Capellen) 2% more. A 6 kWp system therefore produces 5,500 to 6,400 kWh a year, 1.4 to 1.6 times the consumption of an average household (3,900 kWh).
For a self-consumption system of power P (in kWp, at least 2), the subsidy is P × (1,155 − 33 × P) euros below 15 kWp and 10,000 euros from 15 kWp: €3,168 for 3 kWp, €5,742 for 6 kWp, €8,250 for 10 kWp. A battery of capacity Q (kWh) adds Q × (500 − 500/18 × Q) euros, €2,250 from 9 kWh. The subsidy is deducted from the invoice by the installer (pre-financing) for invoices dated 4 January 2026 to 31 December 2029. Condition: waive any guaranteed remuneration for the electricity fed in.
The two cannot be combined. The Klimabonus cuts the upfront investment and suits small or medium systems that self-consume a good share of their output. The guaranteed tariff (13.3 c€/kWh for a first feed-in in 2026, 12.9 c€ in 2027, for 15 years, up to 10 kW) pays better for the surplus and becomes competitive when the system is large relative to consumption. Tool 2 computes both for your case; as a rule, the more you feed in, the closer option B gets to option A.
2026 quotes seen from installers range from €1,600 to €2,200 per kWp installed for 6 to 15 kWp, i.e. €10,000 to €13,000 for 6 kWp, VAT included. Supply and installation on a dwelling qualifies for the super-reduced VAT rate of 3%. After the Klimabonus, a 6 kWp system costs about €4,500 to €7,500.
Only the variable components of the bill are avoided: energy (about 13 c€/kWh in 2026), the grid's volumetric charge (5.10 c€), the compensation mechanism (−3.71 c€ in 2026, thanks to the State's €150 million contribution), the electricity tax (0.10 c€), all subject to 8% VAT: about 16 c€/kWh in 2026, and close to 20 c€ if the State contribution ends. Fixed charges (metering, reference power) remain due. Counting 25 c€ because "my bill divided by my kWh gives 25 cents" overstates the gain.
A battery lifts the self-consumed share from about 30% to 50-60% for a typical house, but costs €700 to €1,100 per kWh installed, part of which the Klimabonus refunds (up to €2,250). With a surplus sold at 5 c€ and an avoided kWh worth 20 c€, each stored kWh earns 15 c€: a 7 kWh battery cycled 250 times a year earns about €260 a year for €4,000 to €6,000 of net investment. It therefore usually lengthens the payback time; tool 2 shows it for your case.
For a private individual operating a system of 1 to 30 kWp, the direct tax administration accepts, as a matter of tolerance, that it is a hobby activity not counted in taxable income (circular L.I.R. no. 14/2 of 5 June 2023, summarised by Klima-Agence). With pure self-consumption there is no commercial activity at all.
The national solar cadastre (energie.geoportail.lu) rates every roof in the country by its potential; Klima-Agence offers free, neutral advice. For a fine estimate, PVGIS accepts the exact address, shading and actual orientation.
The 37,978 installations already connected, municipality by municipality: the lux-solaire dashboard.