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Return on investment for renewable energy projects compares installation cost to energy savings and incentive values over system lifetime.
Formel
Calculate: ROI = (annual savings × years - installation cost) / installation cost × 100%
- ROI
- (annual savings × years - installation cost) / installation cost × 100% — (annual savings × years - installation cost) / installation cost × 100%
Trin-for-trin guide
- 1Calculate: ROI = (annual savings × years - installation cost) / installation cost × 100%
- 2Include tax credits (often 30%), net metering credits, maintenance costs
- 3Typical payback: solar 6-10 years, wind 6-8 years
Løste eksempler
Input
Solar install $10,000, annual savings $2,000, tax credit $3,000, 25-year life
Resultat
ROI ~450%, payback 5 years
Excellent investment
Almindelige fejl at undgå
- ✕Forgetting tax incentives in calculations
- ✕Not accounting for inflation in long-term projections
Ofte stillede spørgsmål
Should renewable energy investments be evaluated like other investments?
Yes, though non-financial benefits (emissions, independence) matter too.
How do incentives affect ROI?
Dramatically; 30% federal credit cuts payback from 8 to 5 years, making projects viable.
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