How much does it cost do have solar power to run an average home? Wind power? hydro Power? How big is the unit

This is for a science project so I need a valid source. By the question about the size of the unit I mean exactly how many solar cells, how many blades, depth of water, models for all(if possible). I’m not looking for someone to do my science fair project, I just need someone to point me in the right direction!!


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