4. Li Hejun

•  Net Worth: $10.9 B                                                                      
•  Source of Wealth: renewable energy
•  Citizen: China
•  Age: 46

Li Hejun chairs and owns 99% of Hanergy Holding Group. The company is active in hydropower, wind power, and solar energy power generation activities. It has become one of the world's largest producers of thin-film solar panels and equipment. He debuts on the Forbes China Rich List this year.