Firmus natural gas
We supply natural gas across Greater Belfast and the Ten Towns network. Enter your postcode to see the plans available in your area, or call us and we’ll help you find the right one.
Welcome to the new Firmus Energy website. A fresh new look with the same great service and value. Take a look around.
Energy plans for new customers
Firmus KeyPad AnytimeSaver
✓ No credit check required
✓ Top up online, in-store or via the app
✓ Keypad meter included
✓ Always know your balance on your keypad
✓ No exit fees
Firmus KeyPad EV Saver
✓ No credit check required
✓ Lower overnight rate for EV charging
✓ Keypad meter included
✓ No exit fees
Our story is all about you
At Firmus Energy, we’re proud to have been part of life in Northern Ireland for over twenty years. From building vital energy infrastructure to supporting the communities we serve, we’ve grown alongside our customers to become a truly local energy supplier, trusted by thousands.
Why choose Firmus Energy ?
READY TO SWITCH?
Enjoy clear energy pricing and trusted local service with Firmus Energy.
Greater Belfast’s Cheapest Offer* for Domestic Credit Customers: Based on customers on the firmus energy Greater Belfast Home Gas Tariff – Credit Meter Online with introductory 25% discount applied in comparison to the SSE Airtricity Tariff - Direct Debit Budget Plan. The Welcome Discount offer is subject to a 12-month contract*. Customers who avail of this introductory offer will see a 25% discount off the standard Greater Belfast Home Gas Tariff – Credit Meter Online as a separate line on their bill. Contact us and we will be happy to talk you through our rates, the 25% Welcome Discount (Domestic)* or any queries that you may have. Correct as of 15/10/2026. Verify at Cheapest Offer* New customer offer only, terms and conditions apply 25% Welcome Discount (Domestic) T&Cs*
Greater Belfast’s Cheapest Offer* for the average firmus Domestic PAYG (Pay As You Go) Customer: Based on customers with an annual consumption of 7,734 kWh**, or lower, calculated using a firmus energy effective unit rate, in comparison to the SSE Airtricity Tariff – Prepayment Meter Pay As You Go. The Welcome Bonus offer is subject to a 12-month contract**. The effective unit rate is calculated using annual consumption of 7,734 kWh** at the firmus energy Greater Belfast Home Gas (PAYG) Tariff with £200.00 Welcome Bonus applied. Customers who use more or less than 7,734 kWh** per year will not receive the firmus energy effective unit rate. If your annual usage is above this, it may not be the cheapest offer and for any customer using 10000 kWh or more per year this is not the cheapest offer. 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 15/10/2026. Verify at Cheapest Offer. New customer offer only, terms and conditions apply £200 Welcome Bonus T&Cs.** 7,734 kWh is the firmus energy average annual consumption for customers with a Pay As You Go meter in the Greater Belfast area.
TrustScore 4.9/5. Showing 5-star reviews. These testimonials represent each customer’s own experience regarding firmus energy and may not be representative of all firmus energy customers.
†Savings tips sourced from: