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Hybrid solutions to propulsion system requirements permit novel solutions to load cycle requirements. By distributing the load between two devices whose efficiency characteristics are complementary, the overall efficiency can be tailored by blending the load contribution. The potential of such a combination is further enhanced if the combination of the devices results in a more complete conversion of fuel than a single device operating alone. In this paper we present a conceptual design for a powerplant made up of a fuel preparation sub-system and a diesel engine. The sub-system is made up of a reformer and solid oxide fuel cell stack that provides a stream of gaseous fuel and air to the engine, as well as producing electrical power. In this configuration the system is essentially an actuator that is controlled through the imposed electrical load. The fuel cell based pre-treatment device has a higher inherent efficiency than the engine.