Passed traffic info. on a wind farm the other day to a guy at fl80 near Dean Cross!
I had a suspicion that the contact was a wind farm, but wasn't 100% convinced, as the contact was also similar to the contacts that you get from gliders.
Asked the pilot to have a look out the window to confrim my suspicion - he did!
Still, despite certain drawbacks, I'd have windfarms over nuclear/coal any day.