And when will this new infrastructure of wind poser begin to need maintenance, which will decrease their profit margin?
The trickiest part of windturbines is making a really reliable transmission. There are few things that produce the torque that a 300 foot windmill produces. The Germans Enercon design has no transmission and just a giant, expensive low speed generator. Most have a 2 stage transmission with a 1200 rpm output and some of them have been known to wear out in as little as 5 years.