The present invention relates to A vehicle engine (100) comprising a combustion part (110), a heat engine (120) and an electrical generator (130). The combustion part (110) comprises a pellet burning unit, which is arranged to generate heat by burning pellets, said pellet burning unit is connected to said heat engine (120), which heat engine is arranged to convert heat from said pellet burning unit to kinetic energy, said electrical generator is arranged to convert said kinetic energy from said heat engine to generate electrical energy for actuating wheels of said vehicle.