You can - and on the contrary, I'm not sure whether they would decrease the value of your home or not, because of the additional income that they could bring. Any house that is moving towards being self sufficient is going to be worth more, surely, because of the fact that they're not going to cost as much for the upkeep. If you think about it, buying a house with a domestic wind turbine would save you money in energy costs, and this could mean that you would be able to pay a little more for the house in the first place.