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I think the moving shadows would drive people insane, and I am willing to bet that so little energy would be produced (small turbine and low wind speeds) that it wouldn't be of much benefit to society. That's not even considering the cost of such a thing. In many places, regular street lights with solar panels on top (but still connected to the grid just in case) are probably sufficient, especially suburban areas where the street lights don't have to be so bright.

Try designing something that could be put onto a person's home though. I'd like to see things like that and solar panels become standard in single-family housing in the future.