Sunrun is the largest residential solar and battery storage company in the United States, offering photovoltaic systems and home battery storage primarily through a no-upfront-cost subscription model (leases and PPAs). Its key product ecosystem includes rooftop solar installation, the BrightBox/Brightbox battery storage system, EV charging integration, and virtual power plant (VPP) grid services. The company targets residential homeowners across 22 U.S. states, Washington D.C., and Puerto Rico, and has surpassed 1 million customers.