Indicative 4 kWp install in Belfast: £6,650–£7,800. Region: Scotland / North / NI (×0.94). Annual irradiance: ~820 kWh/kWp.
What Belfast homeowners actually pay
Solar in Belfast surprises most homeowners. The latitude is the same as Newcastle yet generation is competitive because panels run cooler and degrade slower in Atlantic-influenced air. NIE Networks handles all grid connections itself, which makes the G99 process faster than mainland averages. A 4 kWp install on a typical Belmont semi lands £6,400–£8,200 with annual generation around 3,400 kWh.
Local notes for Belfast
NIE Networks is the sole DNO — G98/G99 paperwork is a single-supplier route, generally faster than GB averages.
NI has its own SEG-equivalent: the Northern Ireland Renewable Obligation closed, and export payments come via Power NI / Click Energy bespoke tariffs (3–8 p/kWh in 2026).
South-facing roofs in Stranmillis and Belmont commonly hit ~850 kWh/kWp/yr despite the latitude — better than expected thanks to cooler panel temperatures.
VAT on domestic solar is 0% UK-wide (including NI) until March 2027.
Field notes
Sole DNO (NIE Networks) — G99 commissioning typically 3–5 weeks.
Export tariffs are bespoke (no GB-style SEG) — 3–8 p/kWh in 2026.
Generation ~3,400 kWh/yr from a typical 4 kWp array.
Frequently asked questions
Does the GB Smart Export Guarantee apply in Belfast?
No. The SEG is a GB-only scheme. In Northern Ireland, export payments are negotiated directly with Power NI or Click Energy and currently sit between 3 and 8 p/kWh — typically lower than the best GB SEG rates.
What size system fits a typical Belfast home?
4 kWp on most Belmont, Stranmillis or Andersonstown semis. Larger homes in Malone or Knock often fit 5–6 kWp.