A family member is installing a decent sized wind turbine, and it's one of the few practical uses of the things I have seen. They're on an upland hill farm, in a notoriously windy and exposed area, and are looking to install a 5 kW turbine, to run lighting in greenhouses during the winter.

But mostly the thing are an utter waste. At a national level (UK), the only sites which are anywhere near reliable enough are a long way from where the power is needed, and are beautiful...