02 Sep '11, 2pm

The Energy-Efficient Subway via @greentechmedia

The Energy-Efficient Subway via @greentechmedia

There's a veritable ocean of untapped power beneath your feet. Vycon Energy , which makes industrial flywheels, says it has come up with a way to harvest energy from subway cars and light rail trains that could help large cities cut their power bills, and even help avoid peak power emergencies. The technology works on the principle of regenerative braking. Speeding trains carry a lot of kinetic energy, which currently goes to waste when the trains slow down to stop at a station. By connecting a flywheel to the rail system, that energy could be converted to electrical power, which in turn would then be used to get the train moving again. It's the same idea Toyota and other car makers exploit for hybrid vehicles. The difference is that the power generated would reach into the megawatts. A 10-car subway train in New York’s system might require a jolt of three to four megawatt...

Full article: http://www.greentechmedia.com/articles/read/the-energy-ef...

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