ESB shift workers have voted to accept the company's Cost and Competitiveness Review (CCR) after twice rejecting the offer. The shift workers were the only group who had not accepted it.
In a ballot over the last two weeks the workers voted by 350 to 200 for the proposals.
The shift workers provide 24 hour relief in power stations. They had considered the pay for what is called "cover" under the new proposals too low.
The number of shift workers was to be cut to 409 under the review, including a built in cover of one "relief worker" per shift. The main issue, the subject of negotiations over the last few months, was the amount of cover pay.
Since the last ballot in April, the ESB has agreed to base cover on "the circumstances in individual power stations". This will mean a change in the way cover pay will be structured, believed to be the main factor which made workers vote for the review this time.
The chief executive of the ESB Mr Joe Moran, had previously said a £50 million refurbishment programme for midland stations would not go ahead if the CCR was not accepted by shift workers.
Mr Denis Rohan, of the ATGWU - along with SIPTU they represent all the shift workers - said the shift workers were happy "the situation was resolved". The arrangements in place were "satisfactory".
A spokesman for the ESB said the company was "extremely satisfied that the shift workers were on board". The CCR would now be implemented in all sectors, including the refurbishment of the midland stations.
Among the provisions of the package are the chance for workers to take out a shareholding in the company and a £2,000 lump sum.