Method for obtaining the optimal operating points of a generator set comprising a heat engine (2) coupled to an electric generator (3). The generator set (1) has a plurality of possible operating points, each operating point comprising an angular speed of the heat engine (2), a torque of the electric generator (3) and an output power of the generator set (1). The method comprises a first step in which all the possible combinations of angular speed and torque for each output power are obtained, a second step in which the efficiency in each of said combinations is calculated, and a third step in which the optimum combination of angular speed and torque for each output power is selected such that the efficiency at each of the selected operating points is maximum.