Mobile working machine with an internal combustion engine (1), an electric motor (4), a hydraulic line system (8) for supplying an engine (9) connectable to the hydraulic line system (8), at least one first hydraulic pump (2) driven by the internal combustion engine (1) at least one second hydraulic pump (7) driven by the electric motor (4), the first and second hydraulic pumps (2, 7) being connected to the hydraulic line system (8), characterized in that the electric motor (4) has a frequency converter (13) is connected upstream, which can be connected to a power source (11).
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