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One of the fastest-growing sources of energy in the world, wind turbines generate electricity without emitting greenhouse gases into the environment (unlike fossil fuels). These modern-day windmills convert mechanical energy from the wind into electrical power.
Most wind turbines have three main parts: the tower (the long stem that connects to the ground); the blades, which connect to a central hub (the rotor); and the nacelle (a box behind the blades that contains the generator).
While there are several different designs for wind turbines — one of which, the "vertical-axis design," resembles a giant eggbeater — most of these machines have a "horizontal-axis design," in which the axis of the blades is horizontal to the ground