Sunday, 13 September 2026 (forecast)
Solar generation in Derry, Sunday, 13 September 2026
Mixed cloud over Derry. Even so, a 4kW install would generate around 10.9 kWh today.
4kW system
Typical 3-bed NI home (10-12 panels)
10.9 kWh
£3.65 of electricity
6kW system
Larger home, EV owner, or heat pump
16.3 kWh
£5.47 of electricity
Weather on the day
- Sunshine
- 9.0 h
- Cloud cover
- 85%
- Max temp
- 18.8°C
- Solar radiation
- 3.49 kWh/m²
Want this generating on your roof?
Compare quotes from MCS certified installers in Derry. Free, no obligation, and quotes for the same system routinely differ by more than £1,000.
Recent days in Derry
How we worked this out
We used daily shortwave radiation data for Derry from Open-Meteo and applied the standard PV yield model:
energy = radiation × system kWp × performance ratio.
The performance ratio is 0.78 (accounts for inverter and temperature losses, orientation and soiling).
Electricity is valued at 33.5p/kWh, the tracker's fixed assumption. Power NI's standard credit rate is 32.100p, so a Power NI household should read these savings as slightly high.
Figures are an estimate based on forecast conditions and a representative install. Actual generation varies with roof orientation, shading and hardware.