An emergency power unit, also known as an emergency generator or backup generator, is a device that produces electrical power during a blackout or when there is no access to the regular power grid. It is used to supply power to essential devices and systems when the normal power supply is unavailable.

An emergency power unit usually consists of a combustion engine, such as a diesel engine or gasoline engine, which is connected to a generator. The combustion engine drives the generator, which in turn produces electricity. The unit can be started as soon as a power outage occurs or can automatically turn on thanks to a special control system.

Emergency power units are available in various sizes and capacities, depending on the intended application. Small portable units can be used to power a few devices, while larger fixed units can supply power to homes, businesses, or even entire buildings during a power outage.

The use of an emergency power unit can help prevent inconvenience, loss of productivity, and damage to devices or systems during a power outage. It is important to regularly maintain the unit and ensure the proper fuel supply so that it can operate reliably when needed.