Tesla, Inc. has SolarCity.
SolarCity Corporation is an American company that specializes in solar energy services and is headquartered in San Mateo , California . It offers energy storage services through its parent company , Tesla Inc. , including a turnkey residential battery backup service that incorporates Tesla 's Powerwall . Tesla, Inc. . The company specializes in electric cars , Lithium-ion battery energy storage , and , through their SolarCity subsidiary , residential solar panels .