Somerset's much-delayed, £18bn Hinkley Point nuclear power station faces yet another hold-up after unions threatened to go on strike over a pay row.
The GMB and Unite unions accused the consortium overseeing the construction of the power station, Bylor, of failing to pay the bonus rate predicated in the HPC Civil Construction agreement.
The unions said the rate offered by the consortium, made up of Laing O'Rourke and Bouygues, is "insufficient to attract the quality of workers needed to ensure that the civil works phase of the... project is completed on time". GMB and Unite will ballot their members from 2 until 5 May.
The construction of Hinkley Point C has already been put on hold several times as the government and EDF, the company behind Hinkley Point, thrashed out a deal.
The project, which has been mired in controversy as costs rose, was put off at the 11th hour last year as Theresa May hesitated before giving the go-ahead to China General Nuclear Power to sign a key contract to help fund the project.
Laing O'Rourke has been contacted for comment. Bouygues could not be reached for comment.