Abstract: A photovoltaic shingle uses a tab shingle body onto which an electrical grid is disposed. A thin film photovoltaic film overlays the wire grid and is electrically coupled to the grid using the shingle body as its substrate. The grid is electrically coupled to a series of leads such that the leads electrically couple to a conduction strip that is attached to a roof underlayment, the strip making a horizontal run on the roof. Each conduction strip is electrically connected to an electrical subsystem that provides electricity for a building and/or transfers electricity to an electrical grid.