The present invention relates to an excavator (10) with a moveable boom (12), comprising a main electrical drive system (24) with an electrical power storage unit (26) and an electrical drive (28) configured to actuate movement of the boom (12) to raise and/or lower at least part of the boom (12), optionally with a pivoting movement; and a separate fluid-operated actuation system (32) for storing potential energy of at least part of the boom (12) during lowering thereof and for using the stored energy to support raising of at least part of the boom (12), wherein the auxiliary actuation system (32) is configured to store the energy and to support raising the part of the boom completely autonomous without any interaction with the main electrical drive system (24).
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