Firmus Energy Network Large Business

We know energy is integral to running your business properly.

And every business is different. At Firmus Energy, we work closely with large businesses to tailor plans to your specific energy needs.

Our medium and large business customers across Northern Ireland already enjoy:

  • Competitive Gas prices
  • Dedicated Key Account Managers.
  • Tailored energy solutions.
  • Fixed and variable natural gas options designed to best meet the needs of your business.
  • Dedicated energy and business specialists.
  • Expert energy advice and up to date market intelligence.
  • 24/7 control of your natural gas account on our online service ‘My Account’.

Because every business is different, it’s important that we talk to you directly. 

Call us on 0330 024 9000 and we will ensure that one of our Key Account Managers talks to you about how we can help your business.


 

Firmus Energy Network Business Gas Tariff (IC1)

Effective 1st October 2026

8.653 Pence per kWh (ex VAT)

1. Our business gas tariffs are subject to a successful credit check.

2. Payment terms are 28 days from the bill date and payment by variable Direct Debit is mandatory.

3. Direct Debit failures will incur a charge of £7.50 + VAT. Two consecutive Direct Debit failures may result in Firmus Energy terminating this agreement and your supply may be disconnected.

4. Failure to pay debt owing to Firmus Energy may result in Firmus Energy passing your information to debt recovery agents and where appropriate law enforcement authorities.

5. We may share the information we have about you with relevant industry organisations based on agreed industry processes.

6. Tariff prices are subject to VAT charged at the applicable rate and CCL (climate change levy) where applicable. Prices may be subject to changes in taxes or other changes, which we are required to make by law, and will be passed through at the required rate.

7. Climate Change Levy (CCL) & VAT
The Climate Change Levy (CCL) rate is currently £0.00801
If your gas usage is less than 145 kWh per day within the billing period, you will not be charged CCL and you will also benefit from a reduced VAT rate of 5%.
Where consumption exceeds this threshold, standard VAT (20%) and CCL will apply.

8. How to Estimate Your Annual Charges
To estimate your annual charges, multiply your Annual Quantity (AQ/Consumption) by the unit rate shown above and then add the applicable VAT rate.

Example
A typical small business with an Annual Quantity (AQ) of 52,925 kWh on the IC1 Business Gas Tariff (8.653p per kWh, ex VAT) would calculate estimated annual costs as follows

Calculation

Amount (£)

Energy Cost (ex VAT)

52,925 kWh × 8.653p

£4,579.60

Climate Change Levy (CCL)

52,925 kWh × 0.801p

£423.93

Total (ex VAT)

£4,579.60 + £423.93

£5003.53

VAT (20%)

£5,003.53× 20%


£1000.71

Total (inc VAT)

£5003.53 + £1000.71

£6004.24

Need Help?
If you require any further information or would like help calculating your expected annual usage or charges, please contact us on 0330 024 9000 and a member of the team will be happy to help.

9. The Company may change the terms and conditions of the Agreement by providing the Customer with 21 days’ notice in writing. If the Customer does not wish to continue with the Agreement as a result of the change, the Customer must notify the Company of this within this 21 day period. If the Customer does this, the change will not take effect and the Agreement, in its unchanged form, will terminate 28 days from the date of receipt by the Company of the Customer’s notification. If the Customer does not reply within the 21 day notice period, the change will be applied to the Agreement without further notice.

10. Firmus Energy Supply terms and conditions can be found here. 

11. Firmus Energy may require a Security Deposit from some customers before you will be supplied by us.  Any security deposit required will be a reasonable amount and will be reflective of your expected burn during an average three month period (quarterly bill). For example, a typical small business with an Annual Quantity (AQ/Consumption) of 20,000kWh would be expected to provide a security deposit of £432.00*. 20,000kWh x p/kWh /4 (for annual consumption). Please see the example below:

Annual Consumption

p/kWh (ex VAT)

£'s

Single unit rate p/kwh

20,000

8.653

£1731.00


Deposit* =

£432.00

*Rounded to nearest pound 

View terms & conditions