Internal Combustion Engines
Emergency generators most often use an automotive or truck engine to drive an electrical generator. These engines typically burn natural gas, diesel, or gasoline. These are typically used for large standby generators at hospitals, manufacturing plants, and other facilities where electrical power is critical. If the facility loses electrical power in a storm or for any reason, the standby generator automatically starts providing electricity to the facility until electrical power restored. Relatively high maintenance costs tend to make these engines undesirable for anything other than emergency generator operation, even when used in cogeneration service.