Monday, 27 April 2026 (forecast)
Solar generation in Derry, Monday, 27 April 2026
Overcast in Derry. A 4kW install would still produce about 6.1 kWh of free electricity today.
4kW system
Typical 3-bed NI home (10-12 panels)
6.1 kWh
£2.05 of electricity
6kW system
Larger home, EV owner, or heat pump
9.2 kWh
£3.08 of electricity
Weather on the day
- Sunshine
- 1.2 h
- Cloud cover
- 92%
- Max temp
- 13.8°C
- Solar radiation
- 1.96 kWh/m²
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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.