the length is the problem. Can’t go round bends too sharp, dips too deep etc. the logistics of moving the super long blades r very nontrivial. The more ‘generic’ windmills I’ve seen in Montana and California r much less problematic but as you’ve pointed out, efficiency goes up w diameter so folks r pushing to use those where they can. Since the blades come into ports in single pieces, inland transportation becomes limiting factor.
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