firmus energy natural gas tariffs for Greater Belfast Network area Find out more

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£200 Cashback Offer

£200 cashback

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Register your interest now and we will contact you as soon as possible or alternatively call our Customer Enquiry Line on 0330 024 9000

£200 cashback

£200 Cashback Offer

Enjoy £200 cashback to spend as you please when you make the switch to natural gas this spring. With over 95,000 firmus energy customers across the province you will be in good company.

Register your interest before 30th June 2021 and switch to natural gas before end of July to claim your cashback. 
To claim your cashback send a copy of your installer invoice into after you have made the switch. You may also post your invoice to Customer Services, firmus energy, A4 – A5 Fergusons Way, Antrim, BT41 4LZ, Northern Ireland.

All terms and conditions can be found here.


‘’ Happy with the whole gas install. Best thing I ever did.’’ Suzanne, L’Derry

‘’ Very happy with it, big improvement from oil boiler.’’ Jason, Banbridge


Visit our YouTube Page - '7 Steps to Switching to Natural Gas' 

This offer is open to firmus energy network customers only.

One offer per connection.

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What kind of business are you?

Why am I having to do this?

To give you the most accurate information for your town and county, please enter your postcode below.

How do you pay for your natural gas?

By Credit

Do you receive a monthly bill for your energy usage?


With a Pay as You Go card

Do you purchase a top-up card for your energy?


What kind of business are you?

Small or Medium Business

Small businesses spend about £2,600 or less per bill. Medium businesses spend about £35,000 or less per bill.


Large Business

Large businesses spend about £250,000 or less per bill

Make sure you have your bank details and SMP number ready

Bank details

All we need is your account number and sort code *


SMP Number

This is the number usually at the top right of your bill

Okay, I have them

If your account requires 2 signatures, or you are not the bank account holder, please call us first on 0330 024 9000
If you don’t have this number, call our switch team on 0330 024 9000