Spain
Madrid rooftop solar case study
Spanish users see 1,700 kWh per kW resources plus flexible compensation erase most utility spend even on mid-sized roofs.
Payback / System Size
System Size
6.8 kW
Annual Yield
9,700 kWh per year
Payback
5.8 years
Avg install cost
€9,600
Annual savings
€2,300 per year
Lifetime value
€36,000
Why this city shines
A Madrid family ran a 6.8 kW design: 9.7 MWh production offsets nearly the entire bill while surplus joins a community solar credit.
Rooftop solar in Madrid works with a 6.8 kW array that delivers about 9,700 kWh yearly. Install costs near €9,600 translate to roughly €2,300 annual savings and a 5.8-year payback under typical tariffs.
Offsets roughly 4.0 tonnes of CO2 annually.