The five big and four little families refer to the five major groups and the four small wealthy families.
The "Five Major Groups": China Huaneng Group Corporation, China Datang Corporation, China Huadian Corporation, China Guodian Corporation, and China Power Investment Corporation.
The "Four Little Giants": SDIC Power, Guohua Power, China Resources Power, and China Guangdong Nuclear Power.
In addition, China National Nuclear Corporation in the nuclear power field, China Three Gorges Corporation in the hydropower field, and Shenhua Group in the coal power field also have large power generation capacity. Some local power generation companies such as Yudean in Guangdong, Zhejiang Zhejiang Energy, and Shandong Luneng Development, but State Grid Xinyuan Holdings, Hebei Construction Investment, Shenergy Group, Guangzhou Development, etc. also have a certain amount of power generation.