SAFT Batteries Max20 containerized Li-ion battery bank (Photo: SAFT Batteries)
An elevated electric train in Holland (Photo: Shutterstock)
Electric commuter trains, while quiet and fast, have one glaring inefficiency – when they brake at a station, the energy of the moving train is lost, even when the motors are electrically reversed. Capturing the electrical energy generated during braking is simple, but efficiently redistributing it through the power grid is not. The result, in too many systems, is that the braking energy is simply wasted. Now an energy storage project in Philadelphia aims to capture and efficiently utilize that braking energy, providing a clear view into the potential of the forthcoming smart grid.
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