"From a techno-economic point of view, an alternating current overhead line is the most beneficial way of meeting the need for enhanced power transfer capability between the Republic of Ireland and Northern Ireland," a new report by experts from the UK, Belgium and Sweden has concluded. This is in spite of opposition from numerous landowners along EirGrid's proposed interconnector in counties Meath, Cavan and Monaghan.

Opponents to overhead lines lost a legal challenge to the project's planning permission in August. The Northern Ireland portion of the line has secured planning permission too.