Firmus Energy

In the Greater Belfast area, firmus energy have over 48,000 customers which is around 23% of the domestic market. In the ‘Ten Towns’ area, firmus energy are currently the only supplier to domestic customers and therefore supply all homes, over 46,000, connected in that area

Firmus Energy - Areas Supplied

The natural gas network in Northern Ireland is divided into three areas – the Greater Belfast area, operated by Phoenix Natural Gas; the Ten Towns area operated by Firmus Energy; and the west of Northern Ireland which is currently being developed by SGN Natural Gas.

Network Operator
SGN Natural Gas
SGN Natural Gas

Gas Suppliers
SSE Airtricity
SSE Airtricity

Network Operator
Firmus Energy
Firmus Energy

Gas Suppliers
Firmus Energy
Firmus Energy

Network Operator

Phoenix Natural Gas

Gas Suppliers

Firmus Energy

SSE Airtricity

If you are unsure who your natural gas supplier is, they are detailed on your natural gas bill or on top of your prepayment top-up receipt.

Firmus energy supply gas to homes in the Phoenix Natural Gas area and Firmus Energy Natural Gas area (‘Ten Towns’) 

The Phoenix Natural Gas network includes the Greater Belfast area including Annahilt; Ballygowan; Ballynahinch; Bangor; Belfast; Carrickfergus; Carryduff; Castlewellan; Comber; Crossgar; Donaghadee; Downpatrick; Dromore; Drumaness; Dundonald; Hillsborough; Holywood; Larne; Lisburn; Newtownabbey; Newtownards; and The Spa.

The Ten Towns area which is operated by Firmus Energy includes Antrim; Armagh; Ballymena; Ballymoney; Banbridge; Coleraine; Craigavon; Derry/Londonderry; Limavady; and Portstewart


Firmus Energy - Cheapest Gas Deals

Bill Pay Tariff

FuelTariff NameAnnual Cost*
Gas (Phoenix Natural Gas Network)Home Gas Tariff (Online)£993.63 (excludes up to £30 Direct Debit Discount)
Gas (Firmus Energy Gas Network)Home Gas£1,293.36 (excludes up to £22 Direct Debit Discount)


FuelTariff NameAnnual Cost*
Gas (Phoenix Natural Gas Network)Home Gas (PaYG)£878.04
Gas (Firmus Energy Gas Network)Home Gas (PaYG)£1230.60

* The Annual Cost is based on average consumption level of 12,000kWh, and excludes any additional cashback or promotional offers

Firmus Energy - Tariff and Payment Information

Tariffs Offered
Discount Tariffs
Pay as You Go Tariffs
Standard Rate

Payment Options
Direct Debit
Card/Cash or Cheque

Billing Options
Postal Billing
Online Billing

Firmus Energy accept a range of payment methods including Online Payment, Telephone, Direct Debit, Prepayment or Cash, Card or Cheque.

Keypad Top Up Options: You can only buy credit for your gas prepayment meter by bringing your gas card to a PayPoint outlet. The minimum payment is £5 and the maximum is £49, in any one transaction.


Firmus Energy – Offers, Promotions and Discount

  • Tariff Discounts
  • Online Billing Discount

[*above are examples in terms of offers and promotions available. It is not meant as an exhaustive list]

Firmus Energy – Contact Details

Tel: 0330 024 9000
Post: Firmus Energy, A4-A5 Fergusons Way, Kilbegs Road, Antrim, BT41 4LZ

If contacting your energy supplier have your customer account number or GPRN. If you do not have access to these, have the name on the account and full address of the property being supplied.


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