The wattage associated with these systems varies significantly based on design and application, but typical ranges are as follows: 1, from several kilowatts up to 100 megawatts or more, 2, energy discharge duration impacting wattage, 3, factors such as flywheel size . The wattage associated with these systems varies significantly based on design and application, but typical ranges are as follows: 1, from several kilowatts up to 100 megawatts or more, 2, energy discharge duration impacting wattage, 3, factors such as flywheel size . Flywheel energy storage (FES) works by spinning a rotor (flywheel) and maintaining the energy in the system as rotational energy. When energy is extracted from the system, the flywheel's rotational speed is reduced as a consequence of the principle of conservation of energy; adding energy to the. A flywheel-storage power system uses a flywheel for grid energy storage, (see Flywheel energy storage) and can be a comparatively small storage facility with a peak power of up to 20 MW. It typically is used to stabilize to some degree power grids, to help them stay on the grid frequency, and to. FESS is used for short-time storage and typically offered with a charging/discharging duration between 20 seconds and 20 minutes. However, one 4-hour duration system is available on the market. Flywheels store energy in the form of rotational energy. Practical limitations reduc this to about 12 watt-hours per pound for a small, 30-pound flywheel (ref.
