The invention aims to limit the specific consumption of an aircraft by matching power supply design and actual power requirements of the cabin pressure control system and more generally the aircraft. The method for optimizing the overall efficiency of the energy supplied on board an aircraft according to the invention consists in providing, in an environment located close to the cabin, at least one generation of engine class main power sized as a source. unique pneumatic power generation for the cabin and as a source for more partial generation of propulsive, hydraulic and / or electric energy for the rest of the aircraft. The method then consists in minimizing in power the difference between the nominal point ((Pn) 1, (Pn) 0) of the power sources in operating situation of these sources and the dimensioning point ((Pd) 0) of the contributions in non-propulsive energy from these sources in the event of failure of a main engine, by equipartition of the power contributions of the main engines and the main power generation in nominal operation and in the event of failure of a main engine.
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