Natural gas is the only fuel approved for home refueling. The Vehicle Refueling Appliance (VRA) is certified as an "appliance", and can be installed outdoors with the option to fuel your vehicle in your own garage.
The VRA provides refueling overnight or while the vehicle is not in use, completely unattended. It is as simple as connecting the hose nozzle to the vehicle receptacle and letting the system refuel your vehicle. Everything is automatic, including the shutdown of the system when the vehicle's fuel cylinder is full.