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Gas & electricity tariffs

Firmus Energy tariffs

Every Firmus Energy tariff available right now — unit rate, standing charge, contract length, exit fee and renewable status. Last verified 14 May 2026.

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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.

Current tariffs

Firmus Energy domestic tariffs

Prices below are the Firmus Energy published rates for a typical single-rate meter on direct debit, excluding VAT. Final bill amounts depend on your region and meter type.

Network Home Gas — Credit (Direct Debit)

variable 28-day rolling
Firmus Energy logo

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.

Gas

6.669 p/kWh

+0.00p/day standing

Contract
28-day rolling
Exit fee
None
View tariff details on Firmus Energy

Network Home Gas — PAYG (firmuscare top-up)

prepayment 28-day rolling
Firmus Energy logo

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.

Gas

6.526 p/kWh

+0.00p/day standing

Contract
28-day rolling
Exit fee
None
View tariff details on Firmus Energy

Greater Belfast Home Gas — Credit (Online)

variable 28-day rolling
Firmus Energy logo

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 £16).

Gas

9.302 p/kWh

+0.00p/day standing

Contract
28-day rolling
Exit fee
None
View tariff details on Firmus Energy

Greater Belfast Home Gas — Credit (Offline)

variable 28-day rolling
Firmus Energy logo

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).

Gas

9.302 p/kWh

+0.00p/day standing

Contract
28-day rolling
Exit fee
None
View tariff details on Firmus Energy

Greater Belfast Home Gas — PAYG

prepayment 28-day rolling
Firmus Energy logo

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.

Gas

9.177 p/kWh

+0.00p/day standing

Contract
28-day rolling
Exit fee
None
View tariff details on Firmus Energy

Network Business Gas (IC1)

business 28-day rolling, mandatory direct debit
Firmus Energy logo

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.

Gas

6.865 p/kWh

+0.00p/day standing

Contract
28-day rolling, mandatory direct debit
Exit fee
None
View tariff details on Firmus Energy

Greater Belfast Business Gas (IC1) — Online

business 28-day rolling, mandatory direct debit
Firmus Energy logo

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.

Gas

9.302 p/kWh

+0.00p/day standing

Contract
28-day rolling, mandatory direct debit
Exit fee
None
View tariff details on Firmus Energy

Prices verified against the Firmus Energy published price list on 14 May 2026. Always check the live price on the supplier's own website before signing up.

How to compare UK tariffs

Three numbers that decide your bill

  1. 1

    Unit rate (p/kWh) — the cost of the energy you actually use. The Energy Price Cap caps the unit rate on the default (Standard Variable) tariff. Fixed tariffs are usually slightly above or below the cap.

  2. 2

    Standing charge (p/day) — what you pay per day even if you use zero energy. Covers network costs, smart-meter rollout and policy levies. About 53p/day for electricity and 32p/day for gas on a typical 2026 tariff.

  3. 3

    Exit fee — what you pay to leave early on a fixed tariff. Typically £25-£75 per fuel. None on Standard Variable. None in the final 49 days of any fixed contract.

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Is Firmus the cheapest for your usage?

Headline rates lie. The only way to know is to compare against your real annual kWh. Selectra's comparison uses your postcode + 12-month usage to find the cheapest current deal.

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Common questions

UK energy tariffs — frequently asked questions

Every UK domestic energy tariff has two components: a standing charge (a flat fee in pence per day, even if you use zero energy), and a unit rate (in pence per kWh you actually consume). Your bill = (standing charge × days) + (unit rate × kWh used) + VAT (5%). Compare both numbers — a tariff with a low unit rate but a high standing charge can cost more than the reverse if you use little energy.

The Energy Price Cap set by Ofgem limits how much suppliers can charge for the default (Standard Variable) tariff. It is reviewed every three months. It does not cap fixed-term tariffs — those can be cheaper or more expensive than the cap depending on wholesale prices.

Most UK fixed-term tariffs include an exit fee (typical range: £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. The default Standard Variable tariff has no exit fee.

Many UK suppliers offer 'green' or '100% renewable' tariffs which match your annual consumption with REGO certificates. This is a paper-trail match, not a guarantee that the electrons reaching your home are renewable — but it does fund continued renewable generation. Tariffs marked '100% renewable' below carry REGO backing.

If wholesale prices are forecast to rise, fixing locks in today's price for the contract length. If they are forecast to fall, the Standard Variable tariff (capped by Ofgem) tracks the wholesale market down. The right choice depends on your appetite for stability vs. potential savings — Selectra's comparison tool factors in both.