Solar panels in Northern Ireland
Roofs across Northern Ireland get about 838 hours of usable sunlight a year, and electricity costs 26.1p/kWh. That combination puts a typical system's payback at 14.2 years. Here's the detail, from real rooftop data across 3 Northern Ireland cities.
Check your own roof in Northern Ireland → These are regional figures; your roof's size, pitch and shading move them a lot.
How Northern Ireland compares
Northern Ireland gets more sunlight than 1% of the cities we measure, and its electricity costs more than 77% of states and provinces. Both matter, but not equally: the electricity rate usually matters more, because solar saves money by replacing power you would otherwise buy. A sunny state with cheap power often pays back slower than a cloudy state with expensive power. Why that happens →
Solar by city in Northern Ireland
| City | Sun hrs/yr | Panels | Net cost | Payback |
|---|---|---|---|---|
| Belfast | 879 | 9 | £6,120 | 13.7 yrs |
| Ballymena | 838 | 9 | £6,120 | 14.2 yrs |
| Derry/Londonderry | 785 | 10 | £6,800 | 15.3 yrs |
What a system costs in Northern Ireland
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 2,279 | £9,120 | £595 | 15.3 yrs |
| 12 panels | 4.8 kW | 3,419 | £13,680 | £893 | 15.3 yrs |
| 16 panels | 6.4 kW | 4,559 | £18,240 | £1,190 | 15.3 yrs |
| 20 panels | 8 kW | 5,698 | £22,800 | £1,488 | 15.3 yrs |
| 26 panels | 10.4 kW | 7,408 | £29,640 | £1,934 | 15.3 yrs |
Payback stops improving as systems grow, then gets worse. You can only save on electricity you were going to buy, so once a system covers your usage the extra panels mostly export at a lower rate.
Northern Ireland solar incentives
The 30% US federal tax credit does not apply in Canada, and the figures on this page exclude it. Canadian support comes through federal programmes such as the Canada Greener Homes Loan plus provincial and utility schemes, which vary and change — check current Northern Ireland programmes directly rather than trusting a figure on a website.
Northern Ireland solar questions
Is solar worth it in Northern Ireland?
At 26.1p/kWh and 838 usable sun hours, a typical Northern Ireland system pays back in about 14.2 years and returns roughly £4,659 across a 25-year panel life. That is slower than average, so compare at least three quotes before committing. Individual cities in Northern Ireland vary widely around this average.
How many solar panels do I need in Northern Ireland?
About 9 panels for a home using 2,500 kWh a year. Each 400W panel produces roughly 285 kWh annually at Northern Ireland sunlight levels. Your own figure depends on actual usage — pull a year of bills rather than assuming average consumption, since heating and EV charging change it a lot.
How much do solar panels cost in Northern Ireland?
A 3.6 kW system runs about £6,120 before incentives, or roughly £1.70 per watt installed. Quotes vary widely by installer, roof complexity and whether your electrical panel needs upgrading — get three before deciding.
Worth reading before you buy
Regional estimates generated 2026-08-22 from Google Solar API rooftop samples across 3 Northern Ireland cities, and average Northern Ireland electricity rates. Not a quote and not financial or tax advice.