This report quantifies the technical potential of photovoltaic (PV) systems deployed on rooftops in the continental United States, estimating how much energy could be generated by installing PV on all suitable roof area. Rooftop potential is not equivalent to the economic or market potential for rooftop solar—it doesn't consider availability or cost. With the tremendous growth of solar installations and the continuing evolution of licensing requirements for photovoltaic and solar installers, IREC's National Solar Licensing Database provides information and references to the licensing, certification, and other requirements impacting the solar. The SEI Solar Professionals Certificate Program (SPCP) is a selective admissions program to help ensure the success of our students and provide a quality workforce for the solar industry. To determine a candidate's likelihood of program completion, alignment of career goals, and overall fit for. This report is available at no cost from the National Renewable Energy Laboratory (NREL) at www. In ad-dition to publishing guides, the Sustainable Solar Education Project will produce webinars, an online course, a monthly newsletter, and in-person training on topics related to strengthening solar.