Elon Musk’s Inventions Changing the World.

Co-founded in 2006 by Musk and his cousins, SolarCity has since grown to become the second-largest provider of solar-power systems in the country, with revenues of $102.8 million in the most recent quarter. While it’s centered in California, it also provides installations in select areas of 14 other states (and the District of Columbia). It’s in the process of creating storage systems letting people tap into power produced by solar panels at night. The company is also working with Tesla to offer free solar-powered charging stations to owners of