Solar energy in Swansea, United Kingdom
Average irradiation 2.93 kWh/m²/day · ~856 kWh per kWp per year
Monthly solar irradiation & temperature in Swansea (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 0.80 | 6.1 | 19 |
| Feb | 1.49 | 5.7 | 36 |
| Mar | 2.66 | 6.7 | 65 |
| Apr | 4.11 | 8.9 | 100 |
| May | 5.02 | 11.7 | 122 |
| Jun | 5.32 | 14.5 | 130 |
| Jul | 5.04 | 16.2 | 123 |
| Aug | 4.16 | 16.3 | 101 |
| Sep | 3.22 | 14.8 | 78 |
| Oct | 1.81 | 12.2 | 44 |
| Nov | 0.96 | 9.2 | 23 |
| Dec | 0.62 | 7.0 | 15 |
Solar potential of Swansea explained
Swansea receives an average of 2.93 kilowatt-hours of solar energy per square metre per day, measured over four decades of satellite observation. In practical terms, every kilowatt-peak of installed PV capacity yields about 856 kWh of electricity per year here, assuming a well-oriented system with a typical 80% performance ratio. While winters are dark, modern panel prices mean solar can still be economical — self-consumption value matters more than raw sunshine here.
Frequently asked questions
Is solar worth it in Swansea?
With 2.93 kWh/m²/day of average irradiation, a 1 kWp system in Swansea produces roughly 856 kWh per year. That is a moderate solar resource; economics depend more on local electricity prices and incentives, which our AI planner can research for you.
How much electricity would a 5 kW system produce in Swansea?
Approximately 4,000 kWh per year — enough to cover a large share of a typical household's consumption.
What data is this based on?
Long-term satellite observations from NASA POWER (1981–present) and the PVGIS SARAH3 database, assuming a performance ratio of 80%.
Compare with nearby cities
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