Predominantly electrically operated earth working machine

A self-propelled earth working machine includes a machine frame and a traveling gear, the traveling gear including drive units rollable on a contact subsurface of the earth working machine, the machine frame supporting a working apparatus, the earth working machine having as a main functional unit a work drive in order to drive the working apparatus to perform a work movement for earth working, and the earth working machine having at least one further functional unit, the earth working machine having a common power source, which provides both the energy for the work drive as well as the energy for the further functional unit. The common power source includes a common electrical supply switching device, to which every functional unit is connected in electrically conductive fashion, wherein the main functional unit includes an electric motor.