After years of being billed as the next great revolutionary means of propulsion, flywheels may finally be ready for prime time. Aside from a few modest successes, flywheels have not lived up to this ...

Typically, most all-electronic uninterruptible power supplies (UPSs) will handle loads in the tens of kVA range. Handling hundreds of kVA requires an electromechanical UPS, like a flywheel-based unit.