The expert review into the North-South Interconnector is expected to be completed by the end of the year.
In March of this year, the Taoiseach told Senator Robbie Gallagher that plans for the powerline would be looked at once more.
The Department of the Environment says the most recent report in 2018 found overhead lines remains the most appropriate option for the line from Meath to Tyrone.
While campaign groups have previously expressed the fear that this final review would be a "whitewash" and not take on-board local concerns.
It's been confirmed that international consultants are currently engaged in the review and their work is said to be "well advanced".
A spokesperson for the Department says it's expected that the review will be finished before the end of 2021.