A flywheel is a mechanical solution for storing kinetic energy. Flywheels offer a very robust mechanism to both store and source large amounts of electrical energy into and out of a system in a very short time.
Applying modern technology to something as simple as a spinning wheel allows the many benefits of a flywheel energy system to be released. These benefits compared to a battery include not being constrained by such tight temperature limits, no development of a charge memory, no lifetime degradation of performance, manufactured from inert materials and precise calculation of remaining charge.
These are all benefits ABB can recommend for an energy storage system (ESS) utilising flywheel energy storage.