The (certainly flawed) idea is to transmit light from the light parts of the world to the dark parts through fiberoptic cables. I am sure somone will come to say that the cables would have to be the diameter of the earth inorder to transmit enough energy-- but there it is :) The idea comes from the basis of not having to transform energy into different form to store it, use light from the sun for light, use mechanical energy from wind for mechanical things. I know that storage of energy is necesary; sail cars are not practical. But does all our energy use have to come from stored sources?
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Storage permits an even dependable supply of energy. One should not have to wait for a thunderstorm or a cyclone to make a piece of toast or do the laundry.
Modify the idea- Instead of fiberoptics around the world (cumbersome and expensive), use fiberoptics in the home. I recall seeing a concept for a parabolic mirror on the roof, with fiberoptic cable to interior light fixtures. All the lighting advantages of a skylight without the insulation loss or pesky hole in the roof.
Fibre optics would be too lossy to trasnmit light that far (around the world).
Possibly doable is fibre optics to carry lighting in the home or office, but the skylight or light-tube is a bit cheaper I think.