If y’all think windmills are cool, think about a helicopter. How much gas is needed to spin the thing. Then you think backwards: how fast the windmill has to spin (how slow but big) to match the gas engine. mmmmmk?
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It's not 'generating' energy, it's transferring the energy from the wind into electrical energy. Not very efficiently, and not as efficiently as fossil fuels do, but that's what is happening in a wind turbine. It just transfers wind energy into electrical energy, which can be distributed and/or stored.