Wind energy is harnessed by a wind turbine. Blades (usually three of them) on the turbine are turned by the wind’s kinetic energy. These, in turn, spin a shaft that is connected to an alternator (alternators are the devices in automobiles that use the engine’s kinetic energy to create electricity, which feeds back into the battery). The electricity created by the alternator can be fed into a battery bank or back into the grid.
Though less efficient than solar panels and other forms of electricity generation, wind turbines are a great supplement. For example, on a cloudy day when photovoltaic panels receive very little energy, wind can give you the extra juice you need.
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