ENERGY ASSEMBLY

An energy assembly includes: an engine including a crank shaft; a starter that starts the engine; an energy converter that is connected to the crank shaft of the engine and converts rotational power of the crank shaft into another type of energy; controlling circuitry configured to control the engine, the starter, and the energy converter; a supporting body supporting the engine, the starter, the energy converter, and the controlling circuitry; and an energy interface that transmits the energy, generated by the energy converter, to an external device detachably attached to the energy assembly. The engine, the starter, the energy converter, the controlling circuitry, and the energy interface are integrated with each other.