firmus energy

firmus energy, natural gas supply in Northern Ireland

firmus energy is a natural gas supplier operating in Northern Ireland and presents itself as a local provider. Its activity is aimed at both homes and businesses, with differentiated tariffs for each segment and its own distribution network. The company obtained a licence to develop a new natural gas network outside the Greater Belfast area, which distinguishes it from other operators in the region.

Gas for the home and for businesses

The company structures its offering into two main areas: domestic supply and commercial supply. For homes, it supplies natural gas with payment options by credit or by prepayment card (Pay As You Go). For businesses, it has specific tariffs and offers segmented by size: small, medium and large businesses, with indicative spend thresholds per bill that the website itself uses to classify the customer.

Among the advantages that the company attributes to natural gas compared with oil are reduced CO₂ emissions, energy efficiency and the ability to control consumption. The website also offers customers the option to track their usage and view bills online through their account.

Tariffs, discounts and contractual conditions

The tariff catalogue includes a domestic online credit tariff for Greater Belfast with a 32% welcome discount off the standard tariff, available to new customers and subject to a twelve-month contract. For customers with a prepayment meter, the company offers a £275 welcome bonus, calculated on a reference annual consumption of 7,734 kWh; the company itself warns that this profile is not the cheapest option for consumption equal to or above 12,545 kWh per year.

The website indicated a price change from October 2026, with increases of 8.9% in the Ten Towns area and 12.5% in Greater Belfast. These conditions are presented as current on the date indicated by the company and are subject to terms and conditions.

Distribution network and coverage

firmus energy has its own natural gas network and offers the possibility to check whether a home can connect to it. The connection checker tool allows you to select the town from a list covering dozens of locations in Northern Ireland, including Belfast, Derry-L'Derry, Lisburn, Newry, Armagh, Bangor, Coleraine, Craigavon, Antrim, Ballymena, Larne, Portadown, Portstewart, Warrenpoint and many other smaller towns.

Customer service and support services

The company maintains a telephone customer service and a contact email, as well as a help section with answers to frequently asked questions: current tariffs, choosing an installer, losing the top-up card, no gas or heating faults, understanding bills, incentives and grants, and the complaints procedure. It also publishes a supply code of practice and a natural gas installers charter.

For gas smell emergencies, the website refers to the Northern Ireland gas emergency service, available 24 hours. The company also has a social programme called firmus care and a careers channel for candidates interested in working for the organisation.

Community and sustainability initiatives

firmus energy presents itself as a company involved in its local community. As part of its charity partnership programme, its employees raised £17,000 for Dementia Northern Ireland, designated as official charity partner during 2024. The company also states plans to move towards a sustainable gas supply and a future net zero carbon footprint, according to statements from its chief executive officer included on the website.