How is wind energy harvested?
Wind is a by-product of solar energy, since it is the sun heating the Earth’s surface that creates wind. Turbines harvest that energy and convert it into electricity and send it through existing electricity grid systems. Wind accumulates energy as it crosses large, uninterrupted corridors called fetches. Oceans, large lakes and prairies are perfect fetches. Turbines can even work on the water, in offshore wind farms. Typically, the turbine’s blades begin to turn when the wind reaches 13 km/h and turn relatively slowly, about 25 revolutions per minute. They shut down when the wind is too strong – 90 km/h and above. And the blades can sometimes rotate to face the wind. Large scale wind farms use turbines as tall as 80 metres — or 30 stories — to produce enough energy to power thousands of homes. Smaller scale systems, involving perhaps just one turbine, use smaller turbines with shorter blades that can power anything from an industrial site to a home and are placed on the same site whe
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