Flywheels can be used to supply short bursts of power for tasks, such as smoothing fast fluctuations in grid voltage or power output from renewable sources, regulating the frequency of alternating current as generators may briefly operate out of sync with the grid, spinning. . Flywheels can be used to supply short bursts of power for tasks, such as smoothing fast fluctuations in grid voltage or power output from renewable sources, regulating the frequency of alternating current as generators may briefly operate out of sync with the grid, spinning. . The California Energy Commission's Energy Research and Development Division supports energy research and development programs to spur innovation in energy efficiency, renewable energy and advanced clean generation, energy-related environmental protection, energy transmission and distribution and. . 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. . Beacon Power is developing a flywheel energy storage system that costs substantially less than existing flywheel technologies. Beacon Power is. . ESSs store intermittent renewable energy to create reliable micro-grids that run continuously and efficiently distribute electricity by balancing the supply and the load [1]. The ex-isting energy storage systems use various technologies, including hydro-electricity, batteries, supercapacitors. . Flywheel Energy Storage Systems (FESS) rely on a mechanical working principle: An electric motor is used to spin a rotor of high inertia up to 20,000-50,000 rpm. Electrical energy is thus converted to kinetic energy for storage. Energy storage is a vital component of any power system. .