The Bord Pleanála hearing into a cross-border electricity connector has been adjourned because the planning notices understated the height of the electricity pylons.
There has already been 22 days of hearings but after taking submissions from the company and campaigners opposing the plan today, the inspector said she would go back to the Bord.
Mary Cunneen said the Bord will then make a decision on whether she could continue with the hearing.
The planning notices said the maximum height of the pylons would be 37 meters.
However, it emerged in evidence that some of them would be 44 meters tall.
Eigrid said there was an error in the planning notices and it is giving detailed consideration to the issue and would contact Bord Pleanála about it.
The company also claimed that the planning notices, in law, were to give general information and alert people to the fact that something was being proposed.
An error did not mean the entire plan was fatally flawed, it said.
Campaigners, however, argued that the planning notices were crucial and that any such significant error meant that the application could not proceed.
They argued that Bord Pleanála could not deal with the plan containing such grave errors.
The inspector said she was adjourning the matter and it would be up to the members of the Bord to decide how to proceed.
There was no indication when that decision will be made.