I'm an industrial engineer who deals with manufacturing. There's a ton that goes into the blades. Going higher up yields more energy, but the width of the blade

I'm an industrial engineer who deals with manufacturing. There's a ton that goes into the blades. Going higher up yields more energy, but the width of the blades are at the limit for transportation under highway bridges. With every rotation, the blade flexes know force at the bottom, high at the top. The materials are really advancing and the efficiency is improving. Cost is the killer of so many renewable energy sources. There is tons of optimization going on for cost.