Local councillors have engaged in a "brutal and awkward" debate with Firmus over the company's energy prices.
It comes as Derry residents are "terrified" over the rising cost of energy, with calls for further immediate support to be given.
During a virtual meeting of Derry and Strabane District Council, which also included Firmus representatives Niall Martindale and Paul Standfield, one councillor went as far as to call the company "despicable".
