Figures show the South West is a long way off meeting its targets for producing green power.
Energy from the Fullabrook Down wind farm, near Ilfracombe, and the new Atlantic Array will only achieve 28% of the green energy target, they show.
The figures were released by Regen South West, the government's renewable energy body.
Plans for the Atlantic Array scheme will go on show in North Devon this weekend.
The Atlantic Array project, which would be built in the Bristol Channel and consist of up to 400 turbines, could power more than one million houses.
If it goes ahead, it would be one of the world's largest offshore wind farms.
However, Regen South West said the region would fall well short of its 2020 renewable energy targets.
Merlin Hyman, from Regen South West, said: "This is a very challenging target.
"Our analysis says if we make the most of the excellent resources we have in the region, we can reach the target, but we certainly have to work hard at it."