firmus energy was established in 2005 and owns and operates a gas distribution network and energy supply business in Northern Ireland, UK.

The distribution network comprises approximately 1,100 km of low-pressure pipelines with connections to over 30,000 residential, commercial and industrial customers. It also supplies gas to over 80,000 customers across Northern Ireland.

iCON acquired 100% of firmus energy in 2014 and realised its interest in 2019.