Formerly known as "State Power Company", it includes the State Grid and all power plants. After the power system reform marked by "separation of power plant and power grid" started in 2000, the power grid business such as transmission and distribution spun off from the former State Power Company was operated by State Grid Corporation, and the power plants were classified into five "power generation groups" (Datang, China Power Investment Corporation, Guodian, Huadian and Huaneng).

North China Power Grid Co., Ltd. of North China Branch: Beijing Electric Power Company, Tianjin Electric Power Company, Hebei Electric Power Company, Shanxi Electric Power Company, Shandong Electric Power Group Company and Hebei Electric Power Co., Ltd.

Huazhong Power Grid Co., Ltd. of Huazhong Branch: Hubei Electric Power Company, Hunan Electric Power Company, Jiangxi Electric Power Company, Henan Electric Power Company, Sichuan Electric Power Company and Chongqing Electric Power Company.

East China Power Grid Co., Ltd. of East China Branch: Shanghai Electric Power Company, Jiangsu Electric Power Company, Zhejiang Electric Power Company, Anhui Electric Power Company and Fujian Electric Power Co., Ltd.

Northwest Branch Northwest Power Grid Co., Ltd.: Shaanxi Electric Power Company, Gansu Electric Power Company, Ningxia Electric Power Company, Qinghai Electric Power Company, Xinjiang Electric Power Company and Tibet Electric Power Company.

Northeast Branch Northeast Power Grid Co., Ltd.: Liaoning Electric Power Co., Ltd., Jilin Electric Power Co., Ltd., Heilongjiang Electric Power Co., Ltd. and Inner Mongolia East Electric Power Co., Ltd.

Manage a number of scientific research units, directly affiliated units and holding companies: State Grid Corporation Operation Branch, State Grid Xinyuan Holdings Co., Ltd., State Grid Energy Development Co., Ltd., State Grid Corporation DC Construction Branch, State Grid Corporation Exchange Construction Branch, China Electric Power Research Institute, State Grid Electric Power Research Institute, State Grid Beijing Economic and Technological Research Institute, State Grid Energy Research Institute, Shandong Luneng Group Co., Ltd., State Grid International Development Co., Ltd., China Power Technology and Equipment Co., Ltd., State Grid Smart Grid Research Institute, Ying Da Media Investment Group Co., Ltd., Zhongxing Power Industry Development Co., Ltd., State Grid Corporation Advanced Training Center, State Grid Institute of Technology, China Anneng Construction Group Company, Ying Da International Holding Group Co., Ltd., China Power Finance Co., Ltd., Ying Da Taihe Property Insurance Co., Ltd., Ying Da Taihe Life Insurance Co., Ltd., Yingda International Trust Co., Ltd., Ying Da Securities Co., Ltd.