Treehugger.com reports on 3d Solar Cells that work underground. ("Cheap 3D Solar Cells Are 6x More Efficient, Work Underground", by Jerry James Stone)
Only a small portion of the optical fibers need to be exposed to the sun. The article reports that this science holds great potential for vehicles and for buildings, as no bulky or obtrusive equipment will be needed. According to ABC Science, the average cable length for a home would need to be about one meter.
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