The notion is simple: Beaming power to Earth using microwaves and radio frequencies. But its implementation is highly complex and remains highly elusive given massive challenges, not to mention equally massive launch costs. Yet the potential for this base-load power is enormous… an unlimited supply of green photons. The paper covers the mechanics, leading initiatives in Japan, China, and the United Kingdom, how power will be beamed from space, space junk, and a long list of envronment\al considerations.

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