An electrical power supply circuit in an aircraft is disclosed. The circuit includes an electricity distribution network on board the aircraft for powering electrical equipment situated in an engine of the aircraft or in the surroundings of the engine, and a power supply generator integrated in the engine of the aircraft for powering a de-icing circuit. The electrical equipment includes nacelle loads connected to a DC voltage distribution bus which is connected to a voltage converter circuit powered by the distribution network. The de-icing circuit includes at least one electrical resistance for dissipating electricity returned to the DC voltage distribution bus by at least some of the nacelle loads.