Portugal
Porto rooftop solar case study
Portugal's coastal irradiation plus streamlined permitting delivers sub-six-year paybacks for most rooftops.
Payback / System Size
System Size
6.0 kW
Annual Yield
8,700 kWh per year
Payback
5.9 years
Avg install cost
€9,200
Annual savings
€1,950 per year
Lifetime value
€31,500
Why this city shines
Porto rowhouses lean on 6 kW arrays delivering 8.7 MWh, covering daytime appliances and feeding the Liberalized Market credit.
Rooftop solar in Porto works with a 6.0 kW array that delivers about 8,700 kWh yearly. Install costs near €9,200 translate to roughly €1,950 annual savings and a 5.9-year payback under typical tariffs.
Offsets roughly 3.5 tonnes of CO2 annually.