The RS17A is a home standby generator permanently connected to your house by an automatic transfer switch. The generator operates on your homes existing Natural Gas or LP Gas supply. It monitors the power company distribution lines 24/7, then automatically starts and runs when it detects an outage and continues to run until the utility restores power. Quiet Connect RS17A home standby generators are powered by a Cummins QSJ999G Engine, designed and built by Cummins, the world-class leader in diesel and natural gas engines. It runs on LP Gas or Natural Gas-field selectable during installation.