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 friction and energy loss. First-generation flywheel energy-storage systems use a large flywheel rotating on mechanical bearings. Newer systems use composite
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allows a solar thermal plant to produce electricity at night and on overcast days. This allows the use of solar power for generation as well as , with the potential of displacing both coal- and natural . Additionally, the utilization of the generator is higher which reduces cost. Even short term storage can help by smoothing out the "
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