SolarCity is a solar power systems company which is founded ny Elon Musk and his cousins Lyndon Rive and Peter Rive. The company is the largest power system company in US with 870MW installed solar power in the country. The company is founded in 2006 and has grown very rapidly until 2014. After 2015 company aims lowering installation and production costs of solar panels. Elon Musk believed in clean Energy and this company proves it.