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During my Solar PV/Thermal Design/Installation courses, one instructor told us about a guy in Iowa I believe, who installed a $20k (complete) windmill grid tied system. The amount of energy he produced was so substantial, the energy company wrote him a check at the end of the year for $11k. The instructor said he immediately planned to install 2 more.
Windmills are great in windy areas, and even better when coupled with solar. Here in CA however, our energy company PG&E does not pay for power like some other companies in other states. There was some legislation happening to change that, but they would still only be required to pay 'wholesale' rate, which is less than 1/2 what they bill us for. Not sure if that legislation has gone through yet or not.
So check with your energy provider and laws in your state first of course