Abstract: A power-supply device that is retrofitted to a shelving system and that provides power to the shelving system having a mounting component that receives an article supporting structure comprises, a power-transmitting rail having a power-conducting element encased in a protective cover. The power-transmitting rail is attachable to the shelving system adjacent to the mounting component. The power-receiving component has a power-receiving element adapted to engage the power-conducting element. The power-receiving component is attached to the article-supporting structure, and the article-supporting structure when attached to the shelving system at the mounting component aligns the power-receiving element to contact the power-conducting element.