An Bord Pleanala has given the green light to the North-South electricity Interconnector.
It published its decision, with conditions attached, on its website this morning.
Hundreds of objections had been lodged against the massive project, which also went through a public hearing lasting nearly three months.
The Interconnector would allow electricity to flow between the Republic and Northern Ireland, and includes almost 3 hundred pylons across counties Meath, Cavan and Monaghan.
Authorities in Northern Ireland haven't yet approved the proposed section of the project which is set to begin at Turleenan, near Moy in County Tyrone and then go through Armagh.