A gasifier energy production device including: a gasifier device including a fuel inlet, an air inlet, and a fuel gas outlet; a heat engine including an air inlet, a fuel gas inlet, and an exhaust gases outlet; a battery; an electrical current generator, the heat engine is coupled to at least the electrical current generator and the electrical generator is coupled to the battery; and a controller such that all fuel gas produced by the gasifier device once the gasifier device produces sufficient gas to make the heat engine operate and until the heat engine has stopped is injected into the engine such that energy required at an output from the energy production device is independent of the production of fuel gas.