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 , which provides a travel voltage (V1), 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 , characterized by - an operation controller which is supplied with an operating voltage (V3) 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 (V3) in the operation grid and for conducting the travel voltage (V1) 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 (V3) in the operation grid with the aid of a second contactor (Q 13 , S 13 ) and for still conducting the travel voltage (V1) to the at least one storage-and-retrieval unit (31, 32, 32a..32c), - wherein the power supply for the mentioned storage-and-retrieval units (31, 32, 32a..32c) providing a travel voltage (V1) differs from the operation grid for the operation controller providing an operating voltage (V3). - 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 , which provides a travel voltage (V1), 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 , - an operation controller which is supplied with an operating voltage (V3) 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 (V3) in the operation grid and for conducting the travel voltage (V1) 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 (V3) in the operation grid with the aid of a second contactor (Q 13 , S 13 ) and for still conducting the travel voltage (V1) to the at least one storage-and-retrieval unit (31, 32, 32a..32c), - wherein the power supply for the mentioned storage-and-retrieval units (31, 32, 32a..32c) providing a travel voltage (V1) differs from the operation grid for the operation controller providing an operating voltage (V3). <EOS>