Three gas network areas
Northern Ireland's natural gas network is split into three areas. Phoenix runs the network in Greater Belfast and Larne. firmus energy runs it in the Ten Towns area. SGN Evolve runs Gas to the West. The network company looks after the pipes and connections. Your bill comes from your supplier.
Greater Belfast and Larne
This covers Belfast and the surrounding area, including towns such as Lisburn, Newtownabbey, Carrickfergus, Bangor, Newtownards and Larne. Businesses here can choose their gas supplier. The Consumer Council lists firmus energy, Go Power and SSE Airtricity as the options.
The Ten Towns area
This covers Antrim, Armagh, Banbridge, Craigavon (including Portadown and Lurgan), Newry, Ballymena, Ballymoney, Coleraine, Portstewart, Limavady and Derry / Londonderry. The Consumer Council lists firmus energy as the supplier for businesses in this area.
Gas to the West
This covers Strabane, Dungannon, Cookstown, Coalisland, Magherafelt, Omagh, Enniskillen and Derrylin. The Consumer Council lists SSE Airtricity as the supplier for businesses in this area.
Not on the gas grid?
Gas doesn't reach every street, even inside these areas. If your premises isn't connected, you may be using LPG or oil instead. To ask about a new connection, contact the network company for your area.
What this means for your business
If you're in Greater Belfast and Larne, it's worth checking your gas contract before it ends, because you have a choice of supplier. Elsewhere, you can still check you're on the right tariff and contract for your usage. Send us your gas bill and we'll tell you honestly what your options are.
Get your prices checked in 4 easy steps
- Snap your billTake a photo, send a PDF or just give us a ring. Whatever's handiest.
- We check our UK supplier ratesWe already hold contracts with the main UK suppliers, so we check your bill against the rates we've got.
- Pick your favouriteWe lay out your options in plain English. No jargon, no hard sell.
- We sort the switchWe do the paperwork and the switch, then keep an eye on your renewals.
More guides
This guide is general information for Northern Ireland businesses, not financial advice. Supplier names are mentioned for information only and don't imply any partnership. Last reviewed October 2026.
