[Neil]

Originally Posted by Alan Varrechia

How many Wind Turbines does it take to make a Wind Turbine. My guess is they could never be economical enough just for that, let alone supplying power for every other kind of industry.

Looks like you guessed wrong. The average windfarm produces 20-25 times more energy during its operational life than was used to construct and install its turbines

Info from here Does building turbines use more energy than they produce? | Environment | theguardian.com