A street sign assembly is fabricated from a composite material having at least one panel for displaying indicia such as street names. Electrical conductors are embedded into the panel to permit attachment and electrical coupling of an integrated power supply module, lights and other electrical devices thereto. The integrated power supply module includes a solar panel and battery in a single weatherproof enclosure that is attachable to the panel. The battery is recharged by the solar panel and power is provided from the module through electrical leads that contact the embedded electrical conductors in the panel.