Campaigners say plans to use overhead cables to connect Denbighshire wind farms to the electricity grid will have a “catastrophic” effect on ancient woodlands.
ScottishPower Manweb wants to put up 17km of pylons linking Clocaenog wind farms to the St Asaph sub-station.
But residents want the cables placed underground to protect the landscape.
Final consultations are being held before the firm submits its application to the Planning Inspectorate.
Plans for the wind farms go back to 2008 with SP Manweb looking after the North Wales Wind Farms Connection Project.
The energy firm wants put the overhead cables on 15m (49ft) tall wooden poles between the north and south of the county.
Residents in the Llannefydd, Henllan, Groes and Cefn Meiriadog areas, who are against the proposals, will hold a public meeting on Wednesday and have launched a petition.
Cllr Sue Lloyd-Williams, who represents the area most affected, said the plans would have “catastrophic implications” for the landscape.
Residents are also concerned about an alternative route proposed near the village of Henllan, which they say will have a major impact on the ancient Hafod Dingle woodland and the grade II-listed “Berain” medieval house.
“While we support the use of renewable energy sources, we are vehemently against the use of massive and unsightly pylons for a number of reasons,” said Mrs Lloyd-Williams.
“We consider this to be nothing less than the exploitation of the outstanding natural beauty of our Welsh communities.”
A spokesperson for ScottishPower Manweb said: “We welcome all feedback on our proposals, and would encourage residents who wish to comment to get in touch.”
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