The National Trust says it will be opposing the proposed Atlantic Array wind farm off the North Devon coast.
The charity, which owns Lundy and large parts of the North Devon coast, has submitted its response to the consultation this summer on the environmental impacts of Atlantic Array.
It says it will be objecting to the proposals when they come forward to the Planning Inspectorate for decision later in the year.
In a statement today it said: "The National Trust supports all the principal forms of renewable energy, providing they are of an appropriate scale and design for their setting, and produce a net environmental benefit. We are demonstrating how this is possible on our own sites, with over 130 renewable schemes already in place and a commitment by 2020 to be producing 50% of our direct energy use from non-fossil sources."
But it adds: "Renewable energy proposals which have a high environmental impact, such as Atlantic Array, present a particular dilemma. The local impact on landscape, setting and habitats have to be balanced against the longer term benefit of avoiding damaging climate change.
"It is now clear that in the case of Atlantic Array, the impacts are so severe that we must object to the whole proposal. Squeezed as it is, between two sensitive coastlines, we do not believe it is possible to locate a viable large scale windfarm within this zone without the damage substantially outweighing the benefits."
Click here to read the National Trust's position statement.