I think it's a genuinely good idea since the post is already there with wires to the powergrid. And I don't think a lot are designed to crumple even if that would be a reason it wouldn't work.
but I think there are a couple of reasons why it's just a good idea and not a great one. as pointed out, a lot of such mills can probably be supplanted by a single larger one that is ultimately cheaper but not sure. if the math works out in your favor it's still a good idea.
and second, even if these mills were put on most large posts, it would probably not cover a significant portion of energy consumption. maybe you can do an estimate on that for a country.
but if only as a powerful symbol and a beginning I have rated this 4
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by Dan Frederiksen