At its core, a flywheel energy storage system stores energy in the form of rotational kinetic energy. The system consists of a large rotating mass, or rotor, that spins inside a vacuum-sealed container. 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. . There is noticeable progress in FESS, especially in utility, large-scale deployment for the electrical grid, and renewable energy applications. This paper gives a review of the recent developments in FESS technologies. These systems offer a range of benefits, including high efficiency, long life cycle, and rapid response times. . Flywheel energy storage (FES) is a kinetic energy storage technology that utilizes a rotating flywheel to store energy. £750k per 1 MW, 2 MWh system. Equipment installation up to low voltage connection point.
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