Typically, a fixture is something that is permanently affixed to the property. Since the generator can be removed without causing damage, then it is not a fixture.

Is a standby generator a fixture?

Simply put, a standby generator is a permanent fixture installed outside of your home by a licensed contractor. It runs on either liquid propane or natural gas to automatically send back up power to your home in a power outage or blackout.

Does a generator light up the whole house?

Automation: Standby generators use automatic transfer switches, which connect to the circuit breaker board in a house. When utility power goes out, the automatic transfer switch turns the standby generator on to energize the entire home without you having to lift a finger.