Switch and Get the Best PAYG Gas Offer in Greater Belfast**
Credit Meter Offer
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!
- 24%* off Gas for New Customers
- Greater Belfast's Best Offer*
- Hassle free switching
- Flexible bill payment options
- Access your account 24/7
- No Interruption to Your Supply
- Trusted by 130,000 Homes
- Enjoy Local Customer Support
- Rated 4.9 on Trustpilot
Pay As You Go Offer
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.
- Enjoy £200 welcome bonus**
- Best PAYG gas offer**
- Easily manage your costs
- Only pay for what you use
- Hassle-Free Switching
- No Interruption to Your Supply
- Trusted by Thousands
- Friendly, Reliable Service
- No more bills
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 Offer* for firmus Domestic Credit Customers based on customers using an annual consumption of 13,685kWh***, or lower, calculated using the firmus energy Greater Belfast Home Gas Tariff – Credit Meter Online with introductory 24% discount and Online Account Discount applied in comparison to the SSE Direct Debit Budget Plan including SSE Airtricity Discount. For customers who use more than 13,685kWh this will not be the best offer. Actual average consumption varies due to weather conditions, changes in energy efficiency and householder behaviour.Customers who avail of this introductory offer will see a 24% discount off the standard Greater Belfast Home Gas Tariff – Credit Meter Online or Offline (subject to customer choice of tariff) as a separate line on their bill. Contact us and we will be happy to talk you through our rates, the 24% Welcome Discount (Domestic)* or any queries that you may have. Correct as of 31/03/2026. Verify at Best Offer* New customer offer only, terms and conditions apply 24% Welcome Discount (Domestic) T&Cs.***13,685 kWh is the average consumption for a firmus Domestic customer with a credit meter in the Greater Belfast area.
Greater Belfast’s Best Offer** for the Average firmus Domestic PAYG (Pay As You Go) Customer: Comparison is based on effective unit rates which include all supplier discounts and welcome credit in Belfast, effective from 1st April 2026, and calculated using the firmus energy average consumption for customers with a Pay As You Go meter in the Greater Belfast area, this being 7,734 kWh per year.Customers obtain firmus energy’s effective unit with an average consumption of up to 7,734 kWh**. If your annual usage is above this, it 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 31/03/2026. Verify at Best Offer*. New customer offer only, terms and conditions apply £200 Welcome Bonus** T&Cs.
