I've read of a few people that live off-grid and rely on wind turbines to charge battery banks. They're not going to ever provide all the power we need, but they do help a little. When I looked this morning, the National Grid was reporting nearly 800MW being supplied by wind turbines. It's a small percentage of the total production, but it's something.
But at what cost? millions and millions of pounds sitting there doing nothing for most of the time. Scrap the subsidies and lets see how much purely private investment continues, if they are that good a deal private investors would be pumping millions in but if the subs we the taxpayer gives them dry up they won't invest because there would be no profit.