PVGIS · SolarMapped

Solar potential in Italy

These figures are the unweighted mean of the city locations listed below, not a national average. Two urban points do not represent an entire country, its roofs or its solar installations.

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Sampled-city benchmark

Estimated PV output1,425kWh/kWp/year

Solar irradiation1,838kWh/m²/year

PV output is estimated electricity from 1 kWp of installed solar panels. Irradiation is sunlight energy received per square meter on the optimally tilted panel plane; it is not electricity.

For a 5 kWp system, multiply the electricity values by five. This simple scaling does not account for roof-specific shading or equipment constraints.

Range across these cities: 1,357–1,493kWh/kWp/year. Panel tilt and direction are location-specific; see each city.

Monthly solar irradiation and PV output

Highest-output month: July · 159.4kWh/kWp/month. Lowest-output month: December · 74.1kWh/kWp/month.

The chart and table use the mean of the listed cities for each month.

Bar lengths compare monthly PV electricity output; exact output and irradiation values are in the table.

Monthly solar irradiation and PV output — Italy
Month	Estimated PV output (kWh/kWp/month)	Solar irradiation (kWh/m²/month)
January	83.1	98.7
February	94.4	114.6
March	126.5	157.2
April	134.6	172.6
May	142	186.1
June	146.8	197.9
July	159.4	217.5
August	151.2	205.2
September	129.6	170.7
October	106.1	134.3
November	77.1	94.4
December	74.1	88.8

Compare cities

Rome1,493kWh/kWp/yearOptimal fixed tilt: 37°Milan1,357kWh/kWp/yearOptimal fixed tilt: 39°

Data and methodology

PVGIS 5.3 (European Commission Joint Research Centre), crystalline silicon, fixed free-standing installation, 1 kWp, 14% system losses, equator-facing panels with optimized tilt and the terrain horizon. Long-term climate estimates are not a forecast or a roof survey. Nearby buildings, trees, roof constraints, snow and local conditions can change actual output.

Rome — Reference coordinates: 41.9, 12.5; Climate dataset / years: PVGIS-SARAH3 / 2005–2023; Data retrieved: 2026-09-22.
Milan — Reference coordinates: 45.46, 9.19; Climate dataset / years: PVGIS-SARAH3 / 2005–2023; Data retrieved: 2026-09-22.

PVGIS methodology · Sources and assumptions (English) · Download the underlying data (JSON)