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Use a giant carbon fiber flywheel on magnetc bearings inside a containment vessel that you can pull a vacume on so you reduce the friction.

Carbon fiber flywheels can spin at 100,000 rpms and store a ton of energy combine them with solar or wind even out power supply with no emmisions .World's energy problen solved, you can thank me later I prefer cash over fame but a statue would be nice too.

  • Jun 6 2012: Sounds good to me. Economically, how would this compare to molten batteries?

    Don't count on that statue.