Solar profitability in Luxembourg: what you actually save

Solar profitability in Luxembourg depends on three variables: your consumption pattern, the electricity tariff, and the surplus resale price. Once those are clear, the maths is simple — and the investment, in 95% of cases, is sharply positive.

Real production in Luxembourg

A south-facing 30°-pitched installation produces about 950 kWh per kWp per year in Luxembourg. For 6 kWp that means ~5,700 kWh/year — roughly a 4-person household electricity consumption excluding heating. East or west orientation loses only 10–15% vs south; north is usually avoided but possible with a specific study.

Self-consumption tariff: your best friend

Every kWh you consume directly avoids buying from Enovos at the current residential price, about €0.30/kWh. Without a battery, the self-consumption rate for a daytime-occupied home averages 30–35%. With a 5–10 kWh battery, that rate jumps to 70–80%. The gap translates directly into annual savings.

Surplus resale: useful but not miraculous

Surplus fed into the grid earns roughly €0.07–€0.10/kWh — four times less than the buy price. That is why maximising self-consumption beats selling. The new 2026 rules explicitly favour this model: full grid-export projects are no longer Klimabonus-eligible.

The 25-year net calculation

For 6 kWp at €6,500 net out-of-pocket, 35% self-consumption and 4,500 kWh/year demand: ~€800/year saved over 25 years = €20,000 cumulative, payback at 7.5 years followed by 17.5 years of near-free production. With a battery pushing self-consumption to 75%: ~€1,300/year saved against €11,000 net — 9-year payback, €32,500 cumulative gain. In all cases the annualised return beats a classic savings account by a wide margin.