Welcome to the world of natural gas for your business
We think you're going to like it here with firmus energy.
Airtricity Customer
or find out How It Works
How It Works
There are 4 easy steps to switch:
-
1
Getting Started
A firmus energy key account manager will receive your completed switch form details and arrange a visit with you to complete paperwork.
-
2
Switching Your Business
Paperwork processed along with company credit check. Once all paperwork has been checked and credit check passed then the application can proceed.
We will contact your current gas supplier by sending a Termination notice (depending on the nature of the account the termination period can up to 28 days). -
3
Your Switch Date
Application submitted to the Network Operator to switch the natural gas supply.
-
4
Welcome!
What happens next?
In or around the date of switch a meter reader will call to the property to obtain a meter read. This read is used to open the customer account with firmus energy and will be sent to the previous supplier to close off the account with them.
- Cheaper natural gas for your home
We are committed to keeping our prices lower. Current tariffs - 24/7 access to your online account
Gives you complete control of your account 24 hours a day. - A commercial energy expert on hand to help you switch!
- It's the same pipes, same meter and there’s no interruption to your gas supply.
- Switching is simple
It's simple and only takes 2 minutes to register your details online. We do the rest.
New Customer
or find out How It Works
How It Works
There are 4 easy steps to switch:
-
1
Getting Started
The Network Operator; Phoenix Natural Gas will notify us that you are interested in connecting to Natural Gas and have chosen firmus energy as your preferred gas supplier. A firmus energy key account manager will contact you and arrange a visit to complete paperwork.
-
2
Switching Your Business
Paperwork processed along with company credit check. Once all paperwork has been checked and credit check passed then the application can proceed.
We will contact your natural gas network operator; Phoenix Natural Gas. -
3
Your Switch Date
Application submitted to the Network Operator for firmus to become your supplier from the date your meter is installed.
-
4
Welcome!
What happens next?
In or around the date of your meter install and switch to natural gas we will obtain a meter read from your Network operator. This read is used to open the customer account with firmus.
- Cheaper natural gas for your home
We are committed to keeping our prices lower. Current tariffs - 24/7 access to your online account
Gives you complete control of your account 24 hours a day. - A commercial energy expert on hand to help you switch!
- It's the same pipes, same meter and there’s no interruption to your gas supply.
- Switching is simple
It's simple and only takes 2 minutes to register your details online. We do the rest.
Large business? Spend approximately £250,000 or less per bill? Click hereNot 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.
