In a shelf storage system (1) comprising at least two shelf units (1a-1d), wherein each shelf unit has a separate moveable shelf feeder device (5) with electric drive motors (6, 7, 8), and comprising an electric energy supply circuit (P, S1, S2, S3) which supplies the shelf units (1a-1d) with electric energy, the shelf feeder devices (5) are designed for recycling electric energy produced in their drive motors (6, 7, 8) by operating them as generators back into the electric energy supply circuit, with the electric energy supply circuit distributing electric energy recycled by the shelf feeder devices among the shelf units according to requirements (arrow ES1, arrow EP).