Luna Ring: A Giant Solar Power Plant on the Moon : TreeHugger: "is Plan Has Robots and Everything!
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The general idea is: You build a massive 'belt' of solar cells around the Moon's equator (that's about 6,800 miles, or 11,000 kilometers). You convert that electricity to microwaves or lasers that you beam back to Earth from the near-side of the Moon (the side always closest to Earth), and you convert those beams back to electricity at power stations so that it can be fed into the grid."
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