A grommet assembly includes, in one embodiment, a single-piece housing having an open top end, an open bottom end, an interior region, an interior wall surrounding the interior region and a housing outer surface. A receptacle support structure is located within the interior region and attached to the interior wall for supporting an electrical power receptacle. A bottom cover is attached to the housing at the open bottom end. The bottom cover includes sidewalls, an interior side facing the interior region of the housing and an opposite exterior side. The bottom cover is configured so that the sidewalls are located within the interior region of the housing when the bottom cover is completely attached to the housing. The grommet assembly further including a fastener operable to secure the housing at an opening formed in a work surface. The fastener includes an upper surface that is configured to engage a lower surface of the work surface.