Where the figures come from
All of our underlying data comes from Luxembourg's official solar cadastre, developed by the Klima-Agence and tetraeder.solar, and published in the “Solar potential in Luxembourg” dataset on data.public.lu.
For each building, the cadastre provides two key pieces of information: thephotovoltaic suitability of the roof (ranked from most to least favourable) and its ground footprint. We aggregate this data by municipality and cross-reference it with addresses to enable searching by roof.
How we estimate
Starting from the ground footprint, we apply a usable area of around 45% (to account for unusable roof faces, chimneys, setbacks and margins). This area is converted into installed capacity at a rate of 5,075 m² per kWp.
Annual output is obtained by multiplying the capacity (kWp) by a yield that depends on the roof's suitability class: from 950 kWh/kWp for the most favourable roofs to 800 kWh/kWp for the least favourable. Savings are estimated by valuing self-consumption at ~€0.20/kWh, and CO₂ avoided via a factor of ~0.4 kg per kWh.
- Usable area≈ 45% of the building's ground footprint
- Area per kWp5,075 m² per installed kWp
- Indicative cost≈ €2,000 per kWp (before grants)
- Yield · high class950 kWh/kWp per year
- Yield · medium class900 kWh/kWp per year
- Yield · low class800 kWh/kWp per year
- Self-consumption value≈ €0.20 per kWh
- Emissions avoided≈ 0.4 kg CO₂ per kWh
Scope & limits
Key takeaway
Our figures are indicative estimates, not a commitment. The capacity that can actually be installed, the output, the price and the grants depend on orientation, pitch, shading, the condition of the roof and the grid connection. Exact values are determined by a photovoltaic installer during an on-site assessment.
For a precise, personalised quote, request a free quote : we'll connect you with a partner installer.