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In the meantime if you would like to contact our Customer Enquiry Team please call 0330 024 9000.
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*.
Why choose
firmus energy?
£250 Welcome Bonus* - Get rewarded when you switch
Hassle-Free Switching - We handle the process for you
No Interruption to Your Supply - Just great service & a smooth switch
Best Gas Offer** - Switch and get the best offer in Greater Belfast
Friendly, Reliable Service - Contact us by phone or email, 5 days a week
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.