Emergency power system

An emergency power system is an independent source of electrical power that supports important electrical systems on loss of normal power supply. A standby power system may include a standby generator, batteries and other apparatus. Emergency power systems are installed to protect life and property from the consequences of loss of primary electric power supply. It is a type of continual power system.

A backup generator for a large apartment building
A backup power fuel cell for telecom applications
A portable emergency power generator in a shipping container

They find uses in a wide variety of settings from homes to hospitals, scientific laboratories, data centers,[1] telecommunication[2] equipment and ships. Emergency power systems can rely on generators, deep-cycle batteries, flywheel energy storage or fuel cells.[3][4]

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