Wind energy benefits:
• pollution free
• costs drop as technology improves
• higher revenues as fossil fuels deplete

Horizontal Axis Wind
Turbine                                                                     

            Two Blades:

• most successful
• used in Solano, California and Oahu, Hawaii
• Contain tethering hubs to reduce dynamic loads created by the tower
• ex. MOD-2

Two Blades with vanes on tip of blades:

• Vanes are:
• emergency brakes
• active brakes for normal shut downs
• held close by electromagnets
• ex. AWT-26 in Washington state

Three Blades:

• suited for remote areas and small power need
• simple form of a wind turbine
• ex. AOC 15/50, Z-40

Three Blades with a tail:

• tail turns to gather the greatest winds
• used in low wind speed areas such as Africa
• ex. PT 3600

Three Blades spin about an axis:
• use wind coming from all directions
• has large amounts of aerodynamic drag
• blades can be changed for area requirements
• ex. FloWind's 300kw EHD

Firewood

Waste to Energy

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