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image Wind Energy :recycle:, 330px-Wind_turbine_1888_Charles_Brush …

- - - - fewer than 14 and typically less than four bird deaths per installed megawatt per year,
      - US wind turbines kill between 20,000 and 573,000 birds per year
      - Actual habitat loss averaged 1.23 hectares per turbine
- - - - In Persia and the Middle East, windmills with woven-reed blades were grinding grain.
        
        Then new ways to use wind energy eventually spread around the world
      - In China, simple wind-powered water pumps were used,
  - - - In 1888, It was invented in Cleveland, Ohio by Charles F. Brush.
        
        In Denmark by 1900, there were about 2500 windmills for mechanical loads such as pumps and mills, producing an estimated combined peak power of about 30 MW.
        
        Three years later, Poul la Cour starts the Society of Wind Electricians.
        
        Then, over a hundred years wind turbines have developed radically until now.
- - - - Lift's force is stronger than wind's force against the front side of blade (drag).
        
        Combination of lift and drag cause the rotor to spin like a propeller.
        
        Rotation of rotor increase from about 18 revolutions/minute to roughly 1800 revolutions/minute by a series of gears.
        
        The turbine's generator produce AC electricity.
  - - - A propeller-style design with blades that rotate around a horizontal axis.
    - - Drag-based, or Savonius, turbines generally have rotors with solid vanes that rotate about a vertical axis
      - Lift-based, or Darrieus, turbines have a tall, vertical airfoil style (some appear to have an eggbeater shape)