On Mon, May 17, 2010 at 7:02 AM, Electron <electron2k4@infinito.it> wrote:
>
> So far I imagined to build and use such a device at home, but I never thought it
> to be really feasible nor that it was already invented, and even used with great
> results! I thought it was just a product of my imagination, instead..
>
> http://en.wikipedia.org/wiki/Flywheel_energy_storage

Caterpillar has some available commercially.  I believe they are used
in high-reliability situations like hospitals, to bridge the gap
between power loss and diesel generators starting.

http://www.cat.com/power-generation/ups
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