France
Paris rooftop solar case study
Case studies from France highlight steady net-metering credits and compact roofs that still close ROI in about eight years.
Payback / System Size
System Size
7.0 kW
Annual Yield
7,200 kWh per year
Payback
7.8 years
Avg install cost
€11,800
Annual savings
€1,900 per year
Lifetime value
€30,000
Why this city shines
A Paris apartment co-op modeled a 7 kW array; 7.2 MWh output feeds heat pumps and cuts utility spend by roughly EUR 1,900 a year.
Rooftop solar in Paris works with a 7.0 kW array that delivers about 7,200 kWh yearly. Install costs near €11,800 translate to roughly €1,900 annual savings and a 7.8-year payback under typical tariffs.
Offsets roughly 2.9 tonnes of CO2 annually.