Elon Musk is the founder of SpaceX, Tesla Motors and PayPal. His fortune is estimated at $31.5 billion. In 2012, SpaceX became the first commercial company that managed to dock its ship with the International Space Station. Currently, the market value of the company is $10 billion.

Li Hejun from Hanenergy Holdings. His fortune is estimated at $31.5 billion. He started his business with the construction of the hydroelectric power plants' dam in Guangdong. In2014, Li managed to earn $3 billion in just two days, when his company's securities jumped by 36%.

Wang Chuanfu from BYD with a fortune of $5.3 billion. The current billionaire started his business in 1995. The first BYD product was batteries for mobile phones. At the moment, the company is the world's leading supplier of batteries, as well as develops solar farms and energy storage stations.

Aloys Wobben from Enercon. His fortune is estimated at $4.2 billion. In Germany, this top manager is called Mr. Wind, since he was fascinated by kites from early childhood. He has a whole collection of such toys. Wobben opened his business in 1984, and Enercon quickly became a global player in the field of alternative energy.

One of the wealthiest women in the world, Christy Walton earned billions thanks to the Wal-Mart supermarket shares, which she got after the death of her husband, John Walton. John also invested in First Solar (solar panels).