A standby generator is a permanent backup power system installed outside your property, similar to an HVAC unit. Unlike portable generators that require manual setup, these systems automatically detect an outage and restore power within seconds. Most models run on natural gas or propane, which means no scrambling for fuel during emergencies. How Standby Generators Compare to Portable Options Automatic vs. Manual: Standby units start automatically, while portable units require setup. Capacity: Standby generators can power entire buildings; portable models typically handle only a few appliances. Fuel Efficiency: With a direct natural gas or propane connection, there’s no need for constant refueling. Safety: No risk of carbon monoxide indoors or extension cord hazards.