Portugal
Lisbon rooftop solar case study
Portugal's coastal irradiation plus streamlined permitting delivers sub-six-year paybacks for most rooftops.
Payback / System Size
System Size
6.5 kW
Annual Yield
9,300 kWh per year
Payback
5.7 years
Avg install cost
€9,500
Annual savings
€2,200 per year
Lifetime value
€33,500
Why this city shines
A Lisbon duplex sized 6.5 kW to cover cooling loads, locking in 9.3 MWh per year and shrinking the bill by EUR 2,200.
Rooftop solar in Lisbon works with a 6.5 kW array that delivers about 9,300 kWh yearly. Install costs near €9,500 translate to roughly €2,200 annual savings and a 5.7-year payback under typical tariffs.
Offsets roughly 3.8 tonnes of CO2 annually.