Solar energy in Niigata, Japan
Average irradiation 3.44 kWh/m²/day · ~1004 kWh per kWp per year
Monthly solar irradiation & temperature in Niigata (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 1.60 | 4.9 | 39 |
| Feb | 2.40 | 4.7 | 58 |
| Mar | 3.47 | 6.6 | 84 |
| Apr | 4.40 | 10.4 | 107 |
| May | 5.17 | 15.4 | 126 |
| Jun | 4.97 | 19.9 | 121 |
| Jul | 4.47 | 23.9 | 109 |
| Aug | 4.72 | 26.1 | 115 |
| Sep | 3.84 | 23.1 | 93 |
| Oct | 2.86 | 18.0 | 69 |
| Nov | 1.98 | 12.8 | 48 |
| Dec | 1.46 | 7.7 | 36 |
Solar potential of Niigata explained
Niigata receives an average of 3.44 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 1004 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 Niigata?
With 3.44 kWh/m²/day of average irradiation, a 1 kWp system in Niigata produces roughly 1004 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 Niigata?
Approximately 5,000 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%.
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