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There are less common varieties with two blades, or with concrete or steel lattice towers.At 100 feet or more above the ground, the tower allows the turbine to take advantage of faster wind speeds found at higher altitudes. When the wind blows, a pocket of low-pressure air forms on one side of the blade.
Although initially it was believed that the initial cost of wind turbine construction is too high to make it a cost effective alternative, long term studies have proven this to be inaccurate.
Recently a study was conducted to determine the amount of time it would take for a new wind turbine, with an average lifecycle of about twenty years, to defray or offer net benefits greater than the impact it would cost to build them (Inderscience Publishers, 2014)....
Upwind turbines also include a yaw drive and motor -- components that turns the nacelle to keep the rotor facing the wind when its direction changes.
Wind Program works with industry partners to improve the reliability and efficiency of wind turbine technology, while also reducing costs.
The program’s research efforts have helped to increase the average capacity factor (a measure of power plant productivity) from 22 percent for wind turbines installed before 1998 to more than 32 percent for turbines installed between 20.
Wind energy costs have been reduced from more than 55 cents per kilowatt-hour (k Wh) in 1980 to under 6 cents/k Wh today in areas with good wind resources.
Wind turbines offer a unique opportunity to harness energy in areas where our country's populations need it most.
This includes offshore wind's potential to provide power to population centers near coastlines, and land-based wind's ability to deliver electricity to rural communities with few other local sources of low carbon power.
wind power capacity has increased more than 24-fold. C., Egyptians used wind energy to propel boats along the Nile River.
The majority of wind turbines consist of three blades mounted to a tower made from tubular steel.