Energy ROI Calculator

Know exactly what your renewable energy investment returns. EU electricity rates average €0.25–0.33/kWh — making the payback on solar, heat pumps, and wind highly competitive.

Your System Details

Location

System Size (kW)

Total System Cost (€)

Incentives Applied (€)

Annual Production

7.2 MWh

Year 1

Year 1 Savings

2.028 €

Payback: 9 years

25-Year Net Savings

31.763 €

After full system cost

CO₂ Offset

39.7 tonnes

≈ planting 1,893 trees

25-Year Cumulative Net Savings

Assumes 0.5%/year degradation and flat electricity rate of €0.28/kWh. Actual results vary.

How this calculator works

• Annual production = system kW × peak sun hours (by region) × 365 days × 0.80 performance ratio
• Annual savings = annual production × your electricity rate
• Payback year = net cost (after incentives) ÷ annual savings
• 25-year projection uses 0.5%/year panel degradation (industry standard)

Results are estimates. Actual performance varies with weather, equipment, and site conditions. See our methodology for full calculation details.

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