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Nah, that's not an actual plan that's being implemented. It's basically a thought experiment at this point. The problem with wireless energy transfer at that scale is that it takes a fuck ton of output power to generate a little bit of input power at a distance (inverse square law)
Correction. It actually has been done.. A prototype has successfully demonstrated proof of concept.
You are right about the efficiency, but since the amount of energy that can be gathered in orbit is so large, the small fraction that can be received on Earth could still be significant.
Yeah, a proof of concept is one thing, but scaling it up to deliver mega or gigawatts is a whole different beast. I'd be concerned about environmental impact with radio waves that strong.