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Beacon Power: My Top Stock Pick for 2008

Awesome videos! This is really interesting technology. Am I to understand what we are seeing is power input into a spinning wheel, which is later engaged to a magnet or something to get power back out of it? Once the wheel hits it maximum rotation speed, it can't accept any more input without wasting it? So maybe the excess power is routed to another wheel in the building. Is this almost like regenerative breaking in hybrid vehicles?