First-generation flywheel energy-storage systems use a large steel flywheel rotating on mechanical bearings. Newer systems use carbon-fiber composite rotors that have a higher tensile strength than steel and can store much more energy for the same mass.OverviewFlywheel energy storage (FES) works by spinning a rotor () and maintaining the energy in the system as . When energy is extracted from the system, the flywheel's rotational speed is reduced a. . A typical system consists of a flywheel supported by connected to a . The flywheel and sometimes motor–generator may be enclosed in a to reduce fricti. . Compared with other ways to store electricity, FES systems have long lifetimes (lasting decades with little or no maintenance; full-cycle lifetimes quoted for flywheels range from in excess of 10, up to 10, cycles.
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On 5 May, more than 30 Israeli Air Force aircraft attacked nine Houthi targets using approximately 50 munitions. Among the attack targets was the al-Imran cement factory east of Hodeidah. Reports from Yemen indicated there were dead and wounded at the cement factory. Houthi-linked media reported four people were killed and 42 others were injured. According to an Israeli security source: "We destroyed Hodeidah port and concrete factories that were used for manufacturing.
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