Sunrun Inc. is engaged in the design, development, installation, sale, ownership and maintenance of residential solar energy systems (Projects) in the United States. The Company is engaged in providing solar energy services and products to its customers. As of December 31, 2016, it operated a fleet of residential solar energy systems in the United States, with approximately 134,000 customers across 16 states, as well as the District of Columbia. The Company sells to homeowners over the phone, in the field through canvassing and in-home sales and through retail sales channels through its strategic partners. The solar service offerings are provided through its lease and power purchase agreements. It sells solar service offerings and installs solar energy systems for homeowners through its direct-to-consumer channel. It sells solar energy systems to homeowners, as well as related products, such as solar panels, inverters, racking systems and other solar-related equipment to resellers.