Fine Gael Councillor Hughie McElvaney from Co Monaghan has resigned over the issue of the pylon construction for North-South Pylon Interconnector.
He was with the party for 40 years.
Speaking to Northern Sound, Councillor McElvaney criticised the party, but did not rule out a return in the future.
"Why be part of an organisation and an elected member for it and putting yourself out in the frontline all the time if you're just totally ignored all the time? I was just sick of it," he said.
"I know of Independents and people who have resigned form the party before and have rejoined it, yeah...one never knows what I might do."