Flywheel energy storage (FES) works by accelerating a rotor () to a very high speed and maintaining the energy in the system as . When energy is extracted from the system, the flywheel's rotational speed is reduced as a consequence of the principle of ; adding energy to the system correspondingly results in an increase in the speed of th.
[pdf] This is a list of states by total electricity generation, percent of generation that is , total renewable generation, percent of total domestic renewable generation, and in 2022. The largest renewable electricity source was , which has exceeded since 2019.
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