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UK domestic energy supplier

Firmus Energy UK

Founded in 2005 and based in Newtownabbey, County Antrim, Firmus Energy is the largest natural-gas supplier in Northern Ireland with about 113,000 homes and businesses. Firmus operates two distinct gas networks, the Ten Towns area (where it is the sole supplier) and Greater Belfast (where it competes with SSE Airtricity and Yuno Energy).

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Founded 2005 About 113,000 homes and businesses Newtownabbey, County Antrim

Founded

2005

Years on the UK market

Customers

About 113,000 homes and businesses

Households served

Employees

About 150

Workforce size

About

Who is Firmus Energy?

Registered as firmus energy (Supply) Limited, Firmus Energy uses this legal name for Ofgem licence filings, contracts and any formal communications. The trading name customers see on bills is the shorter, more recognisable form.

The company is headquartered in Newtownabbey, County Antrim, where it runs its senior management, customer operations and regulatory liaison with Ofgem.

Firmus Energy was established in 2005. A longer track record means more years operating under Ofgem rules and a wider history of customer feedback, billing systems and regulatory interactions.

Firmus Energy is part of the Yuno Group (since 31 October 2024 — supply business only) group, which provides shared governance, financial backing and a broader pool of expertise in trading, hedging and regulatory work.

As a Northern Ireland energy supplier, Firmus Energy is regulated by the Utility Regulator (UR) for Northern Ireland, not Ofgem. Statutory consumer protection is handled by the Consumer Council for Northern Ireland (CCNI), which escalates unresolved complaints on behalf of NI households.

Network coverage

Where Firmus Energy supplies energy

Firmus Energy operates on 2 distinct distribution networks. Each network has its own pricing, regulatory rules and competing suppliers, check which one covers your postcode before comparing tariffs.

Network

Firmus Energy Network (Ten Towns)

Sole licensed gas distributor and supplier

Connections
About 70,000 connections
Mains
1,400 km of gas mains pipeline
Investment
Over £100 million invested in NI gas infrastructure since 2005

Main towns & areas

  • Antrim (incl. Ballyclare, Templepatrick)
  • Armagh (incl. Tandragee)
  • Ballymena (incl. Broughshane)
  • Ballymoney
  • Banbridge
  • Coleraine (incl. Portstewart, Bushmills)
  • Craigavon (incl. Portadown, Lurgan)
  • Derry / Londonderry
  • Limavady
  • Newry (incl. Warrenpoint)

Good to know: Firmus is the only gas supplier you can buy from on the Ten Towns network — there is no retail competition here.

Network

Greater Belfast

Competitive supplier on the Phoenix / Mutual Energy network

Connections
About 43,000 connections

Main towns & areas

  • Belfast
  • Newtownabbey
  • Lisburn
  • Bangor
  • Carrickfergus
  • Holywood

Good to know: In Greater Belfast you can also choose SSE Airtricity Gas or, since 2024, Yuno Energy. Phoenix Natural Gas owns and maintains the mains here.

Current tariffs

Firmus Energy tariffs: as of 14 May 2026

Northern Ireland gas tariffs are not subject to the GB Energy Price Cap. Instead, every Firmus price change must be approved in advance by the Utility Regulator. Domestic gas tariffs in NI have no standing charge by regulatory convention, you pay only for the kWh you consume.

Firmus Energy domestic and business tariff unit rates as of 14 May 2026
Tariff Type Unit rate

Network Home Gas — Credit (Direct Debit)

Default credit-meter tariff on the Ten Towns network. Standing charge is zero; direct-debit customers receive a £5.50 per quarter discount. 28-day notice to switch — no exit fee.

Term: 28-day rolling · no exit fee

Variable 7.002 pence per kWh

Network Home Gas — PAYG (firmuscare top-up)

Prepayment (firmuscare) tariff on the Ten Towns network. Top up at PayPoint, online or via the firmuscare app. Unit rate slightly lower than the credit tariff.

Term: 28-day rolling · no exit fee

Prepayment 6.852 pence per kWh

Greater Belfast Home Gas — Credit (Online)

Greater Belfast credit tariff for customers who manage their account online. Discount is paid annually and depends on consumption (£30 if annual usage exceeds 8,000 kWh, otherwise...

Term: 28-day rolling · no exit fee

Variable 9.767 pence per kWh

Greater Belfast Home Gas — Credit (Offline)

Greater Belfast credit tariff for paper-bill customers. Same headline unit rate as the online plan but a smaller direct-debit discount (£22.05 if >8,000 kWh, else £5.51).

Term: 28-day rolling · no exit fee

Variable 9.767 pence per kWh

Greater Belfast Home Gas — PAYG

Prepayment (firmuscare top-up) tariff for Greater Belfast. Slightly lower unit rate than the credit equivalent. Top up at PayPoint or via the firmuscare app.

Term: 28-day rolling · no exit fee

Prepayment 9.635 pence per kWh

Network Business Gas (IC1)

Standard small-business (IC1) gas tariff on the Ten Towns network. Mandatory direct debit. Climate Change Levy of 0.00801p/kWh is added on top of the unit rate.

Term: 28-day rolling, mandatory direct debit · no exit fee

Business 6.865 pence per kWh (ex VAT, ex CCL)

Greater Belfast Business Gas (IC1) — Online

Small-business (IC1) credit gas tariff for Greater Belfast. £30 annual online discount applies above 8,000 kWh. CCL of 0.00801p/kWh is added on top of the headline rate.

Term: 28-day rolling, mandatory direct debit · no exit fee

Business 9.302 pence per kWh (ex VAT, ex CCL)
Open the full Firmus tariffs page

Regulator

Who regulates Firmus?

Independent watchdog responsible for licences, price approvals and customer-protection rules.

Licence
Utility Regulator NI — Gas Conveyance & Gas Supply Licences (Greater Belfast & Ten Towns)
Complaints escalation (ADR)
Consumer Council for Northern Ireland (CCNI) — Utility Regulator escalation

Northern Ireland gas customers escalate unresolved complaints to the Consumer Council for Northern Ireland. The Utility Regulator approves every NI gas price change in advance.

Companies House
NI058107

Timeline

Firmus Energy — key dates

A short timeline of the Firmus Energy brand — founding, milestones, regulatory events.

  1. 2004

    The Carrickfergus-Derry pipeline is completed, paving the way for natural-gas distribution outside Greater Belfast.

  2. 2005

    firmus energy launches as a Bord Gáis subsidiary — first NI business gas supply (Michelin tyre factory, Ballymena).

  3. 2006

    First residential customers connected in Derry (April). South-North pipeline commissioned (October), creating an all-Ireland gas network.

  4. 2008

    firmus energy is awarded an electricity supply licence (later relinquished — gas remains the sole retail focus).

  5. 2013

    Bord Gáis Éireann agrees to sell firmus to a Centrica / Brookfield / iCON Infrastructure consortium.

  6. 2014

    iCON Infrastructure takes control of firmus energy.

  7. 2019

    iCON exits and Equitix Investment Management acquires 100% of firmus energy.

  8. 2024

    firmus energy (Supply) Ltd is sold to Yuno Group (31 October) for around €40 million. The Ten Towns distribution network stays with Equitix. Customer count: ~113,000 homes and businesses.

  9. 2025

    Firmus celebrates 20 years of natural-gas connections in NI; over £100m invested and 1,400 km of mains built across the Ten Towns area.

  10. 2026

    Ten Towns Network home gas price cut by 10.1% effective 1 April 2026, lowering the credit unit rate to 7.002 p/kWh (inc VAT).

Customer service

How to reach Firmus Energy in 30 seconds

The lines you actually need on speed-dial. Every other line (Welsh, Relay UK, business switching, bereavement) is on the full contact page.

General enquiries

0330 024 9000

Mon-Thu 9 a.m.–5 p.m., Fri 9 a.m.–3.30 p.m.

firmuscare top-up

0800 032 4567

Free prepayment line, same hours

Gas emergency (NI)

0800 002 001

24/7, do not call the GB 0800 111 999 line

Dial Before You Dig

0330 2367 091

Pipeline-location requests for contractors

Open the full Firmus contact directory
Save up to £300 per year
Independent comparison

Is Firmus the cheapest option for your home?

UK households can save up to £300 per year by switching to a supplier whose tariffs fit their actual gas + electricity usage. Compare against suppliers regulated by Ofgem in under two minutes.

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Common questions

Firmus Energy — frequently asked questions

Firmus Energy is regulated by Ofgem and operates under a standard domestic-supply licence. Whether it is the right supplier for your household depends on your unit rate, standing charge, customer-service rating and any add-on services (HomeCare, Warm Home Discount eligibility). Always quote your annual kWh consumption when comparing prices — the headline rate alone does not predict your bill.

Switching to Firmus Energy takes about five working days under the new Faster Switching service, and your supply is never interrupted. Sign up online with your address, postcode and a recent meter reading. Firmus Energy will arrange the transfer with your current supplier, including the final meter reading and the closing bill.

The UK grid is supplied by a mix of gas, nuclear, wind, solar, biomass and imports. Firmus Energy declares its fuel mix annually under Ofgem rules — see the fuel-mix section above for the current figures. Some tariffs are sold as 'green' or '100% renewable', which means the supplier matches your annual consumption with renewable electricity certificates (REGOs) rather than physically delivering renewable electrons to your home.

Most UK fixed-term tariffs include an exit fee (typically £25-£75 per fuel) if you switch before the contract ends. You can switch without an exit fee in the last 49 days of your contract. Variable tariffs (including the default tariff capped by the Energy Price Cap) have no exit fees.

You can reach Firmus Energy on 0330 024 9000, Mon-Thu 9 a.m. to 5 p.m., Fri 9 a.m. to 3.30 p.m.. For a full breakdown of phone lines (emergency, prepayment, HomeCare, bereavement, Welsh, Relay UK), see the Firmus Energy contact page.

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