Solar energy in London, Canada
Average irradiation 3.77 kWh/m²/day · ~1101 kWh per kWp per year
Monthly solar irradiation & temperature in London (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 1.52 | -4.9 | 37 |
| Feb | 2.01 | -4.7 | 49 |
| Mar | 3.42 | 0.1 | 83 |
| Apr | 4.64 | 6.5 | 113 |
| May | 5.60 | 13.3 | 136 |
| Jun | 6.33 | 19.2 | 154 |
| Jul | 6.29 | 22.6 | 153 |
| Aug | 5.51 | 21.9 | 134 |
| Sep | 4.33 | 17.9 | 105 |
| Oct | 2.70 | 10.6 | 66 |
| Nov | 1.70 | 4.1 | 41 |
| Dec | 1.15 | -1.5 | 28 |
Solar potential of London explained
London receives an average of 3.77 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 1101 kWh of electricity per year here, assuming a well-oriented system with a typical 80% performance ratio. This is a solid mid-range solar resource: production is meaningful year-round, though winter output drops noticeably.
Frequently asked questions
Is solar worth it in London?
With 3.77 kWh/m²/day of average irradiation, a 1 kWp system in London produces roughly 1101 kWh per year. That is a good solar resource; with current panel prices most systems pay back well within their lifetime.
How much electricity would a 5 kW system produce in London?
Approximately 6,000 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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