The use of independent ventilation as a cooling method for large rotating electrical machines has proven to be an excellent solution for low-speed machines with high output power or machines with variable speed operation. In both situations, the use of forced ventilation with fixed rotating speed is the most used solution to meet the cooling requirements of the electrical machine. However, when associated with a VFD system, it becomes possible to vary the speed of the cooling fans according to the demand of the ventilation system. Taking advantage of the cubic variation between fan power consumption and its rotation speed, it is possible to reach substantial savings in electrical energy consumption used to drive the fan motors when the electric machine operates below its nominal operating conditions. In this paper, studies are conducted on savings of electrical energy consumption of independent ventilation motors in scenarios where the main machine operates below the nominal ambient temperature and cases where it runs with reduced power.