It’s a not a new battery or super-hot liquid salt. But while they are not the sexiest of innovative power solutions, there is much to love about flywheels. Yes, flywheels. The energy storage ...

A 22-year-old inventor combines two old technologies into a bicycle that saves energy when it brakes and can then accelerate without pedaling. The technology of a flywheel is simple and old: Use ...

A clever mechanical clutching/flywheel mechanism gets more energy out of train track vibrations than conventional piezoelectric approaches. Most transducers designed to harvest vibrational energy ...