Greater Belfast’s Cheapest Offer* for the Average Domestic Credit Customer: Comparison is based on effective unit rates which include all supplier discounts in Belfast, with effect from 1st November 2025, 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 12,500kWh. If your annual usage is above this, it is not the cheapest 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 20% Welcome Discount (Domestic)* or any queries that you may have. Correct as of 16/10/2025. Verify at Cheapest Offer*. New customer offer only, terms and conditions apply 20% Welcome Discount (Domestic)* T&Cs.

Greater Belfast’s Best Offer** for the Average Domestic PAYG Customer: Comparison is based on effective unit rates which include all supplier discounts and welcome credit in Belfast, effective from 1st November 2025, 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 12,000kWh. 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 16/10/2025. Verify at Best Offer**. New customer offer only, terms and conditions apply £200 Welcome Bonus** T&Cs.