The invention is related to a method for controlling an electrical installation from a remote control station, the electrical installation comprising a coupling network 5 powering one or more electrical loads 7, 8, a main switch 13 to connect a main power source 10 to the coupling network 5 and an auxiliary switch 23 to connect an auxiliary power source 20 to the coupling network 5. The control method comprises a first step for synchronising the auxiliary power source 20 with the main power supply source 10 comprising a phase of measuring electric data relative to the main power supply source and to the auxiliary power source and a verification phase, from the remote control station, to ensure that the measured electric data relative to the main power supply source and the auxiliary power source is compatible, a step to send an order to close the auxiliary switch 23 from the remote control station, a step to send an order to open the main switch 13 from the remote control station and a checking step, from the remote control station, that the loads 7, 8 are correctly powered by the auxiliary power source.