Solar energy in Surabaya, Indonesia
Average irradiation 5.25 kWh/m²/day · ~1533 kWh per kWp per year
Monthly solar irradiation & temperature in Surabaya (NASA POWER)
| Month | Irradiation (kWh/m²/day) | Avg temp (°C) | Est. production per kWp (kWh) |
|---|---|---|---|
| Jan | 4.91 | 27.1 | 119 |
| Feb | 4.91 | 27.0 | 119 |
| Mar | 5.05 | 27.3 | 123 |
| Apr | 5.02 | 27.8 | 122 |
| May | 4.93 | 27.9 | 120 |
| Jun | 4.83 | 27.7 | 118 |
| Jul | 5.10 | 27.6 | 124 |
| Aug | 5.72 | 28.2 | 139 |
| Sep | 6.25 | 29.4 | 152 |
| Oct | 6.07 | 29.8 | 148 |
| Nov | 5.44 | 29.0 | 132 |
| Dec | 4.81 | 27.7 | 117 |
Solar potential of Surabaya explained
Surabaya receives an average of 5.25 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 1533 kWh of electricity per year here, assuming a well-oriented system with a typical 80% performance ratio. This places Surabaya among the stronger solar locations globally — comparable to southern Spain or California.
Frequently asked questions
Is solar worth it in Surabaya?
With 5.25 kWh/m²/day of average irradiation, a 1 kWp system in Surabaya produces roughly 1533 kWh per year. That is an excellent solar resource — payback periods are typically among the shortest worldwide.
How much electricity would a 5 kW system produce in Surabaya?
Approximately 8,000 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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