A Co Dublin coastal community group is taking a case against Eirgrid in a row over cables for the east-west interconnector going through the town of Rush.
The action by Rush Community Council was admitted to the Commercial Court by Mr Justice Peter Kelly, who fixed it for hearing in July.
The link will connect the power system to the British grid via undersea and underground cables and is expected to be able to supply about 350,000 homes. It is set for completion later this year.
The legal action centres on a section of the interconnector that comes to shore from under the seabed at North Beach in Rush to the Rogerstown estuary. The group says it is close to homes.
Yesterday, Brian Murray SC, for Eirgrid, said there was consent from both sides to the case being fast-tracked.
Rush Community Council is seeking an order restraining Eirgrid from operating the link in any way resulting in creation, production or emission of time- varying magnetic fields. It is seeking a declaration that if the link does create such a magnetic field, it is an unauthorised development.