For your situation (And the payback maybe quite a long time) - with your huge energy consumption, if wind is to be in your future and put any dent in things at all, consider buying a serious wind turbine-  maybe a Bergey xcell or something along those lines.  (or try to build one - but....  you need a big wind turbine to make a difference).  Even on the prairie - short towers wont make sense.  

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