I propose a "simple" change to how kinetic windmills work, requiring a long metal/wood post connecting the windmill to the deep ground (bedrock, yes bedrock).
That should be enough to increase the cost of the powerful windmills and promote people to do something about the long post standing out of the ground (aesthetic).
Wooden rotors windmills can be supported by a wooden fence, iron rotor windmills can be supported by an iron fence, steel rotor and carbon rotor windmills can be supported by steel fences (new block).
(windmill)
(fence/posts)
(bedrock)