The earliest windmills were invented in the ninth century AD in the Middle East and were used to grind grain or to lift water.
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6000 years ago wind power was harnessed in what now is Iraq.
http://www.answers.com/main/ntquery?s=windmill&gwp=13
windmill is a process of contain electricity.
Depends how big the windmill is.
The windmill was made in stop cheating do your homework