A company contracted by the ESB to work on the Moneypoint Power station has terminated its contract with a Polish based sub contractor working on the site.
The decision by Lentjes to cancel its contract with ZRE will result in the immediate cessation of work by 200 Polish workers employed by ZRE.
The TEEU said the workers must be offered work with whichever company gets the new contract and it would use all means at its disposal to ensure this.
In a statement, the ESB said Lentjes had informed it that the decision was taken in accordance with the requirements of Irish labour and employment law.
The ESB said it is concerned about the implications for the ZRE employees and will work through the main contractor Lentjes 'to ensure appropriate arrangements are in place for ZRE staff'.
The ESB said that arising from its monitoring arrangements on site, it was aware of a number of outstanding issues with ZRE in relation to its compliance with labour and employment laws.
The ESB said it was assured that a replacement contractor will be in place quickly to complete the work previously carried out by ZRE.
Lentjes is the turnkey contractor on the environmental retrofit project at Moneypoint power station. Until today, Polish company ZRE had been the mechanical erection sub-contractor at the site.