A system for feeding operating gas to a drive (1) of a motor vehicle, including an atmosphere-side suction inlet (2a) for air under atmospheric pressure, and a feed line (2) for the operating gas to the drive (1) under an operating pressure, the operating gas which is conducted to the drive comprising at least part of the air which is sucked in, at least part of the operating gas being conducted through a turbomachine (3) upstream of the drive (1) in a first operating type, the turbomachine (3) comprising an electric generator (4), and the turbomachine (3) being operated in a second operating type as a compressor for the operating gas, an actuable valve arrangement (5) being provided, at least part of the air which is sucked in being conducted in a turbine direction (T) through the turbomachine (3) in a first position of the valve arrangement (5), and at least part of the air which is sucked in being conducted in a reversed compressor direction (V) through the turbomachine (3) in a second position of the valve arrangement (5).