The main topic of this paper is a conceptual concept design of hybrid propulsion system for skid-steer loader. There will be increased demand of small construction machinery with alternative propulsion systems in future and manufacturer Way Industries, a.s. is aware of this problem. This paper is focused on electric hybrid system for skid steer loader Locust L903. We made changes in existing design Locust L903 to implement four independent electric motors integrated in wheel hubs powered from battery. Our solution use battery as a main energy source and it is charged mainly from electrical grid but small internal combustion engine is used as a range extender.