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We just need to explode a very large bomb filled with glitter in high-earth orbit! This will slightly reduce the amount of light reaching the day-side of the Earth, and dramatically increase the light available on the night side, reducing hour-by-hour variability in the output of solar panels (reducing difference between night and day), especially for those further from the equator.(Just kidding...)
A proposal was made a few years ago, and perhaps a few decades ago to use microwaves to beam the solar energy down from space. See the discussion here.http://www.thenakedscientists.com/HTML/questions/question/2849/http://www.thenakedscientists.com/forum/index.php?topic=35774Building such a system would be extremely expensive, and likely would not pay for itself.Alternatively one might build a large parabolic mirror, and focus a beam of white light to the earth. I think I saw a suggestion of inflatable supports. In space, it would take very little gas to fill, but any leakage would be extremely expensive to replenish.Depending on the size of the beam and intensity, it could be damaging to birds, insects, or aircraft, although short-term exposure likely won't be a big problem.
No need for fancy collectors, just bathe a city with reflected sunlight.