Saturday, 8 August 2026 (forecast)
Solar generation in Derry, Saturday, 8 August 2026
Overcast in Derry. A 4kW install would still produce about 5.3 kWh of free electricity today.
4kW system
Typical 3-bed NI home (10-12 panels)
5.3 kWh
£1.78 of electricity
6kW system
Larger home, EV owner, or heat pump
8 kWh
£2.67 of electricity
Weather on the day
- Sunshine
- 1.5 h
- Cloud cover
- 93%
- Max temp
- 16.7°C
- Solar radiation
- 1.70 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 Power NI standard credit tariff.
Figures are an estimate based on forecast conditions and a representative install. Actual generation varies with roof orientation, shading and hardware.