Polish workers at the ESB's Moneypoint power station have voted unanimously to take industrial action.
The Technical, Engineering and Electrical Union claims the workers have not been paid in the past six weeks and that they were told on Friday that their employment was terminated.
Representatives of the union and senior ESB management will meet in the morning.
The men are employed by a Polish sub-contractor, but the company's contract has been cancelled by the Lentjes Group, which holds the overall contract from the ESB for refurbishment work at the power station.
The ESB has said it would be working with the contractor to ensure the workers were paid properly.
