Key facts
| Network operator | NIE Networks (the only distribution network operator in Northern Ireland) |
| Planning authority | Belfast City Council; Antrim and Newtownabbey, Lisburn and Castlereagh, and Ards and North Down councils for nearby sites |
| Clean air zone | Not confirmed; see the note below |
| Indicative yield | About 820 to 900 kWh per kWp a year for a well-oriented array |
| Nation support page | Grants and support in Northern Ireland |
Grid connection with NIE Networks
NIE Networks runs the whole distribution network in Northern Ireland, so there are no licence boundaries to check. Its connection rules are Northern Ireland versions of the GB documents:
- G98/NI covers small systems up to 16A per phase.
- G99/NI Fast Track was widened on 1 May 2026 and now covers installations up to 60A per phase, with export still limited to 16A per phase.
- G99/NI applies to anything larger, which includes most commercial roofs.
G99/NI is not a fit and inform process: approval must be granted before installation begins. Applications are queued once they are valid and the fee is paid, and NIE Networks then issues a quotation that must be accepted within its validity period, with milestones for planning and completion. Our page on G99 and DNO applications explains the general process.
No Smart Export Guarantee
The Smart Export Guarantee applies in Great Britain only, so there is no equivalent obligation on suppliers in Northern Ireland. Any payment for exported power depends on what a supplier is willing to offer. That makes using generation on site even more important: the business case for a Belfast roof should rest on self-consumption, and a battery can help shift midday surplus into the evening. See battery storage for business and our page on the Smart Export Guarantee for the GB comparison.
Planning in Belfast
Since the 2015 reform of local government, Belfast City Council has been the planning authority for most applications in the city, with the Department for Infrastructure dealing with regionally significant ones. Neighbouring councils cover major employment areas just outside the city: Mallusk, with its business and enterprise parks off the M2, is in Antrim and Newtownabbey, and Lisburn falls to Lisburn and Castlereagh.
Northern Ireland has its own permitted development order, separate from England, Scotland and Wales, and listed buildings and conservation areas carry extra controls.
TODO for the site owner: Confirm the current Northern Ireland permitted development rights for solar on non-domestic buildings (any size limits and conditions) before publishing, and add a short summary here.
The local economy and solar
Belfast Harbour is a working port with a large estate of businesses around it, including the Titanic Quarter and the Harland and Wolff yard on Queen's Island, with Belfast City Airport and the Duncrue industrial area close by. The city's economy also includes aerospace and advanced engineering, software and cyber security, financial and professional services, food and drink, health and two universities. Food processors, engineering firms and distribution sites at the harbour and in Mallusk tend to have the daytime demand that makes solar pay without export income. See our food and drink page.
Clean air and vehicle charging
TODO for the site owner: Confirm whether Belfast has, or has formally proposed, a clean air zone or low emission zone. Do not state that it has none until this is confirmed.
Whatever the position on emissions zones, many Belfast fleets are moving to electric vans, and charging them from a rooftop array during the day is a good use of power that would otherwise be exported with no guaranteed payment. See EV charging for business.
Roofs and buildings in Belfast
- Victorian red brick linen mills and warehouses in the city centre and north and west Belfast, some listed, with heavy timber or iron roof structures that need a structural check.
- 1960s to 1980s industrial units across the harbour estate and older estates, often roofed in asbestos cement sheeting; see asbestos roofs.
- Modern distribution sheds in Mallusk and around the harbour, with profiled metal roofs that suit large arrays.
Expected generation
A well-oriented array in Belfast typically produces about 820 to 900 kWh per kWp a year (indicative). The European Commission's PVGIS model gives close to 920 kWh per kWp for an ideally angled south-facing array with standard losses, and nearer 740 for a low-pitch east-west layout.
How the free survey works
Tell us about the site using the short form. We review your enquiry and call you to understand the building and your energy use. If the site looks suitable we arrange a free survey with one MCS certified installer matched to it, and your details go to that installer only. Ask the installer about their experience with NIE Networks G99/NI applications. The survey can be in person or virtual, and there is no obligation. See our Northern Ireland page for the wider picture.
Frequently asked questions
Is there a Smart Export Guarantee in Belfast?
No. The Smart Export Guarantee applies in Great Britain only. In Northern Ireland any payment for exported electricity depends on what a supplier chooses to offer. That is why commercial systems in Belfast are usually sized to match on-site daytime demand, sometimes with a battery to store midday surplus for later use.
What changed in the G99/NI Fast Track in 2026?
From 1 May 2026 NIE Networks widened the G99/NI Fast Track route to cover installations up to 60A per phase, up from 16A, while keeping export limited to 16A per phase. Larger commercial systems still need a full G99/NI application, and approval must be granted before installation begins. Check the NIE Networks website for current thresholds.
Who handles planning for a unit in Mallusk?
Antrim and Newtownabbey Borough Council, because Mallusk lies in that council area rather than Belfast. Since 2015 Northern Ireland's councils have handled most planning decisions, with the Department for Infrastructure taking regionally significant applications. Check whether your rooftop system falls within permitted development before work begins, and get landlord consent if you lease the unit.
Can solar work without export payments?
Yes, if most of the generation is used on site. Each unit you use instead of buying from the grid saves your full unit rate, which is worth far more than a typical export payment. The survey uses your half-hourly or monthly data to size the array so that little is wasted, and can model a battery if useful.
Related pages
- Northern IrelandNIE Networks and the G98/NI and G99/NI process, no Smart Export Guarantee, council-led planning, and the agri-food and manufacturing buildings that suit solar.
- GlasgowSP Energy Networks G99 approvals, Scottish permitted development, the city centre Low Emission Zone and roofs from Hillington Park to Eurocentral.
- LiverpoolSP Energy Networks G99 approvals, planning across Liverpool, Sefton, Knowsley and Wirral, port and logistics roofs and listed dock buildings.
- Northern IrelandCurrent solar support in Northern Ireland for businesses, community groups, public bodies and farms, plus export, rates, planning and official contacts.
Battery storageWhen a commercial battery pays: storing surplus solar, time of use tariffs, peak shaving, sizing from half-hourly data, illustrative costs, safety and siting.