A storage arrangement (101..103), comprising - several storage places for piece goods that are arranged next to one another and on top of one another, - several computer-controlled storage-and-retrieval units (31, 32, 32a..32c), which are displaceable relative to the storage places, for storing the piece goods in the storage places and retrieving the piece goods from the storage places, and - at least one power supply (4, 4a, 4b), which provides a travel voltage, for the mentioned storage-and-retrieval units (31, 32, 32a..32c), and - at least one electric energy storage (C, Ca, Cb), which is assigned to or comprised by the at least one mentioned power supply (4, 4a, 4b), characterized by - an operation controller which is supplied with an operating voltage by an operation grid and which is on the output side connected to a control coil (Q 10, Qn, Q 12) for switching contacts (S 10, S 11, S 12) of a first contactor in a current path to a storage-and-retrieval unit (31, 32, 32a..32c) and is designed for keeping this first contactor closed during traveling operation of the storage-and-retrieval unit (31, 32, 32a..32c) and sufficient operating voltage in the operation grid and for conducting the travel voltage to the at least one storage-and-retrieval unit (31, 32, 32a..32c), and - a circuit which is designed for switching the electric energy storage (C, Ca, Cb) for this storage-and-retrieval unit (31, 32, 32a..32c) to the control coil (Q 10, Q 11, Q 12) of the first contactor in case of an excessive drop of the operating voltage in the operation grid with the aid of a second contactor (Q 13, S 13) and for still conducting the travel voltage to the at least one storage-and-retrieval unit (31, 32, 32a..32c), - wherein the power supply (4, 4a, 4b) for the mentioned storage-and-retrieval units (31, 32, 32a..32c) providing a travel voltage differs from the operation grid for the operation controller providing an operating voltage. - several storage places for piece goods that are arranged next to one another and on top of one another, - several computer-controlled storage-and-retrieval units (31, 32, 32a..32c), which are displaceable relative to the storage places, for storing the piece goods in the storage places and retrieving the piece goods from the storage places, and - at least one power supply (4, 4a, 4b), which provides a travel voltage, for the mentioned storage-and-retrieval units (31, 32, 32a..32c), and - at least one electric energy storage (C, Ca, Cb), which is assigned to or comprised by the at least one mentioned power supply (4, 4a, 4b), - an operation controller which is supplied with an operating voltage by an operation grid and which is on the output side connected to a control coil (Q 10, Qn, Q 12) for switching contacts (S 10, S 11, S 12) of a first contactor in a current path to a storage-and-retrieval unit (31, 32, 32a..32c) and is designed for keeping this first contactor closed during traveling operation of the storage-and-retrieval unit (31, 32, 32a..32c) and sufficient operating voltage in the operation grid and for conducting the travel voltage to the at least one storage-and-retrieval unit (31, 32, 32a..32c), and - a circuit which is designed for switching the electric energy storage (C, Ca, Cb) for this storage-and-retrieval unit (31, 32, 32a..32c) to the control coil (Q 10, Q 11, Q 12) of the first contactor in case of an excessive drop of the operating voltage in the operation grid with the aid of a second contactor (Q 13, S 13) and for still conducting the travel voltage to the at least one storage-and-retrieval unit (31, 32, 32a..32c), - wherein the power supply (4, 4a, 4b) for the mentioned storage-and-retrieval units (31, 32, 32a..32c) providing a travel voltage differs from the operation grid for the operation controller providing an operating voltage.