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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Tesla's "free energy" tech doesn't work well when too many people connect to it, you can't keep a cohesive circuit. It also doesn't sustain high enough power to drive things like major appliances.