The construction of the North - South interconnector would see huge devaluation of property and damage to heritage sites, according to the North East Pylon Pressure group.
The proposed construction would see 400 pylons built on a route from Meath to Tyrone.
Speaking following oral hearings into the construction yesterday, Amy Treacy from the NEPP said that the pylons would be disastrous for the region.
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"There would be several hundred million, in the region of 600 million devaluation of property along the whole route," she said.
"The impact on our landscape - it's just phenomenal. These pylons - they're great monsters that can be seen several kilometres away.
"And also out cultural heritage. We pride ourselves with Meath being the Royal County, Cavan and Monaghan with the drumlins - all of that would be completely destroyed."