The "Zumwalts" use an Integrated Power System (IPS), which is a modern version of a turbo-electric drive system. The IPS is a dual system, with each half consisting of a gas turbine prime mover directly coupled to an electrical generator, which in turn provides power for an electric motor that drives a propeller shaft. The system is "integrated" because the turbo-generators provide electrical power for all ship systems, not just the drive motors. The system provides much more available electrical power than is available in other types of ship.