According to UE regulations, starting with 2020, the amount of dioxide de carbon (CO₂) will be limited to 95 g/km. Reducing the engine’s fuel consumption will lead to lower CO₂ emissions. As presented in the paper, making greater use of exhaust gas energy to further compress the intake air can lead to a reduction in CO₂ emissions compared to the classic supercharging solutions. In this regard, one solution is to drive the supercharger with a variable-speed electric motor. The paper presents in detail the electrical power required for powering the electric motor. The modern concept of supercharging which use the electric motors is emphasized. In addition, the paper identifies a solution to power the electric motor with electricity obtained from a process to recover the exhaust gas energy.