Wind turbine
OverviewHistoryWind power densityEfficiencyTypesDesign and constructionTechnologyWind turbines on public display
The windwheel of Hero of Alexandria (10–70 CE) marks one of the first recorded instances of wind powering a machine. However, the first known practical wind power plants were built in Sistan, an Eastern province of Persia (now Iran), from the 7th century. These panemone windmills were vertical-axle windmills, which had long vertical drive shafts with rectangular blades. Made of six to twelve sails covered in ree
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