PVGIS · SolarMapped
Solar potential in Finland
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.
Explore on the solar map ↗Sampled-city benchmark
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: 877–974kWh/kWp/year. Panel tilt and direction are location-specific; see each city.
Monthly solar irradiation and PV output
Highest-output month: May · 139.2kWh/kWp/month. Lowest-output month: December · 8.9kWh/kWp/month.
The chart and table use the mean of the listed cities for each month.
| Month | Estimated PV output (kWh/kWp/month) | Solar irradiation (kWh/m²/month) |
|---|---|---|
| January | 15 | 17.7 |
| February | 35.8 | 41.5 |
| March | 88.5 | 104.1 |
| April | 114.3 | 139.1 |
| May | 139.2 | 175.4 |
| June | 136.6 | 176 |
| July | 135.8 | 176.7 |
| August | 114.9 | 148.1 |
| September | 77 | 96.9 |
| October | 44.8 | 55.1 |
| November | 14.6 | 18.3 |
| December | 8.9 | 10.9 |
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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.
- Helsinki — Reference coordinates: 60.17, 24.94; Climate dataset / years: PVGIS-SARAH3 / 2005–2023; Data retrieved: .
- Tampere — Reference coordinates: 61.5, 23.76; Climate dataset / years: PVGIS-SARAH3 / 2005–2023; Data retrieved: .
PVGIS methodology · Sources and assumptions (English) · Download the underlying data (JSON)