I have been involved in about 10 windfarm environmental reviews, only 2 went to construction and production. They have their own significant impacts and come with major limitations. In fact the Site C hydro project is explicitly designed to mitigate the nearby windfarms impacts on the grid, with a .4 second power generation switch on to replace power from the windfarm when it automatically stops producing when windspeeds either drop below or go above certain thresholds.