Merriam-Webster's Dictionary defines a flywheel as a device that stores kinetic energy or uses kinetic energy for braking. A flywheel like that made by Active Power (NASDAQ: ACPW) could be just what your datacenter needs if you're worried about a loss of power.
Sure, you've got a diesel generator (or five) in the basement, and it could take a minute or two for them to crank up. They're engines and they don't go on instantly like a battery.
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