Greater Belfast Business tariffs

Greater Belfast Large Businesses

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 pricing. 
  • 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.

Greater Belfast Business Gas Tariff Online

Effective 8th October 2026

 10.465 Pence per kWh (ex VAT)

Annual Online Account Discount for customers using more than 8,000 kWh is £30.00 (ex VAT)

In order to avail of this discount you must:

  • Pay by Direct Debit.
  • Read your own meter monthly and submit the readings to us through your Firmus Energy online account within the time frames stated in the reminder email or text.
  • View your bills online. Paper copies will not be issued.
  • If you fail to adhere to these conditions you will not receive the Online  Account Discount.

Firmus Energy will:

  • Remind you when your meter reading is due. If you submit a late meter reading this will not be used to generate or correct your estimated bill.
  • Physically read all meters annually with any reconciliation being added to the following bill.

Additional Information:

Our Greater Belfast Business Gas Tariffs are subject to a successful credit check.

Customers using less than 73,200kWh will receive a monthly bill (IC1).

Payment terms are 28 days from the bill date and payment by variable direct debit is mandatory.

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.

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.

If you wish to switch to another supplier, Firmus Energy must be given written confirmation 28 days before the date you would like to switch.

We may share the information we have about you with relevant industry organisations based on agreed industry processes. Should you choose to transfer your natural gas supply we may need to share information with your chosen supplier including details of any outstanding debt on your account.

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.

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.

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 Greater Belfast Business Gas Online Tariff (10.465p per kWh, ex VAT) would calculate estimated annual costs as follows:

Calculation

Amount (£)

Energy Cost (ex VAT)

52,925 kWh × 10.465p

£5538.60

Climate Change Levy (CCL)

52,925 kWh × 0.801p

£423.93

Annual Online Account Discount

-£30.00

VAT (20%)

£5932.53× 20%


£1186.51

Total (inc VAT)

£5932.53 + £1186.51

£7119.04

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.

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 £523.00*. 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

10.465

£2093.00


Deposit* =

£523.00

*Rounded to nearest pound 

The European Energy Consumer Checklist is a set of questions put together by the European Commission to allow consumers to compare information on energy markets across member states.This checklist is found here.
View terms & conditions

Greater Belfast Business Gas Tariff Offline

Effective 8th October 2026

 10.465 Pence per kWh (ex VAT)

Additional Information:

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

Customers using less than 73,200 kWh will receive a monthly bill (IC1).

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

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.

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.

If you wish to switch to another supplier, Firmus Energy must be given written confirmation 28 days before the date you would like to switch.

We may share the information we have about you with relevant industry organisations based on agreed industry processes. Should you choose to transfer your natural gas supply we may need to share information with your chosen supplier including details of any outstanding debt on your account.

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.

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.

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 Greater Belfast Business Gas Offline Tariff (10.465p per kWh, ex VAT) would calculate estimated annual costs as follows:

Calculation

Amount (£)

Energy Cost (ex VAT)

52,925 kWh × 0.801p

£5538.60

Climate Change Levy (CCL)

52,925 kWh × 0.801p

£423.93

Total (ex VAT)

£5538.60 + £423.93

£5962.53

VAT (20%)

£5932.53× 20%


£1192.51

Total (inc VAT)

£5962.53+ £1192.51

£7155.05

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.

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 £523.00*. 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

10.465

£2093.00


Deposit* =

£523.00

*Rounded to nearest pound 

The European Energy Consumer Checklist is a set of questions put together by the European Commission to allow consumers to compare information on energy markets across member states.This checklist is found here.
View terms & conditions