A curtain wall including an extruded aluminum sill having a first channel for receiving a glazed panel, a sill anchor/access portion for securing the sill to a poured concrete slab or slab wall, and toward the interior side of the sill, a wireway is defined in part by the sill and in part by a wireway cover for concealing power and/or data/telecommunication cables. The wireway cover may also include outlet devices or plugs arranged in a longitudinally spaced relationship.