A charging locker includes a frame, and a plurality of modular shelf units. Each modular shelf unit having an integral floor, at least one side wall, and a back wall. The plurality of modular shelf units are configured to extend vertically above one another to form a stack of modular shelf units in which the side walls and back walls of the plurality of modular shelf units form nearly contiguous first and second surfaces. A plurality of tabs on corners of each of the modular shelf units are provided to be received in notches in the frame to support the modular shelf units relative to the frame. A plurality of electrical receptacles are also provided. At least one electrical receptacle is accessible from within each of the modular shelf units.