Smell gas? If you smell gas, contact the 24hr NI Gas Emergency Service immediately on 0800 002 001
Switch and Get the Best Gas Offer in Greater Belfast**
Join thousands of customers enjoying firmus energy natural gas and get a £250 Welcome Bonus*.
Credit Meter
or find out How It Works
How It Works
There are 4 easy steps to switch:
-
1
Getting Started
What you will need:
Bank Details: Including sort code and account number. These can be found on your bank statement or cheque book.
SMP Number: This can usually be found at the top right-hand corner of your bill. If you don't have a copy of your bill, simply call our Switch Team on 0330 024 9000 and they can help you. -
2
Switching Your Home
We will contact your current gas supplier on your behalf and keep you updated by letter or email. You have ten working days from the date you submitted your online application to cancel.
-
3
Your Switch Date
Your switch date is usually 5-6 weeks from the date we receive your application online or by phone. You will receive a letter confirming the date that you will become a firmus energy customer.
-
4
Welcome to firmus energy
What happens next?
You will receive your firmus energy welcome pack and notification of your Direct Debit instructions. Finally, sit back and enjoy cheaper natural gas from firmus energy!
- £250 Welcome Bonus*
Get rewarded when you switch - 24/7 access to your online account
Gives you complete control of your account 24 hours a day - Pay by Direct Debit
Sign up online to pay by Direct Debit and enjoy a discount of up to £30 a year - Hassle-Free Switching
We handle the process for you - No Interruption to Your Supply
Just great service & a smooth switch - Trusted by Thousands
Heating homes across Northern Ireland - Friendly, Reliable Service
Contact us by phone or email, 5 days a week - Tariff Rates
Check out our latest tariff rates.
Pay as You Go
or find out How It Works
How It Works
There are 4 easy steps to switch:
-
1
Getting Started
Your Meter Module Number:
this can be found on your meter.
Your Meter Serial Number: this can also be found on your meter and can start with an ‘E’, 'S' or an 'I'.
e.g. E6 S00123456789. -
2
Switching Your House
We will contact your current gas supplier. We'll send you a letter or email to keep you up to date. You have 10 working days from the date you submitted your application online to cancel.
-
3
Your Switch Date
Your switch date is usually 5-6 weeks from the date we receive your application online or on the phone. You will receive a letter confirming the date that you will become a firmus energy customer.
-
4
Welcome!
What happens next?
We will write to you to confirm you are a firmus energy customer and the steps you need to carry out to update our tariff on your meter. If you have a blue PAYG card we will send you a new firmus energy card.
- Manage Your Costs
Pay as you go and keep an eye on your spending - Hassle-Free Switching
We handle the process for you - £250 Welcome Bonus*
Get rewarded when you switch - No Interruption to Your Supply
Just great service & a smooth switch - Trusted by Thousands
Heating homes across Northern Ireland - Switching is simple
It only takes five minutes to submit your details online - Friendly, Reliable Service
Contact us by phone or email, 5 days a week
Offline Belfast Credit Meter
Paying by Direct Debit is optional with the offline tariff however if you do, you will receive a discount of £22.05 per annum.
Connect NowNot connected to natural gas yet?
Phoenix Natural Gas, owns, operates and develops the natural gas network throughout the Greater Belfast area. firmus energy have a licence within this area to supply natural gas. Please contact a member of Phoenix's connection team to discuss your options 03454 55 55 55.
Greater Belfast’s Best Gas Offer** for the Average Customer: Comparison is based on effective unit rates which include all supplier discounts and welcome credit in Greater Belfast and calculated using the Ofgem average domestic usage of 12,000kWh. Customers obtain firmus energy’s effective unit with an average consumption of up to 13,500kWh. If your usage is above 13,500kWh, this is not the best unit rate. Actual average consumption varies due to weather conditions, changes in energy efficiency and householder behaviour. Contact us and we will be happy to talk you through our rates, the Welcome Bonus* or any queries that you may have. Correct as of 29/05/2025. Verify at Best Gas Offer**. New customer offer only, terms and conditions apply Welcome Bonus* T&Cs.
