This is very interesting, it shows there is much research to be done in this field.

A windmill is not just a windmill, if you see some can offer the same results with far less numbers it's twice as good since you don't need all the extra resources and maintenance!

Some people tend to forget that in order to create a windmill you ask a lot of nature too, so just placing a lot of them doesn't help, you have to place the correct one on the correct place.