How many local power companies are there?

Local independent power grid enterprises, including: Inner Mongolia Electric Power Group Co., Ltd., Hubei Danjiang Electric Power Co., Ltd., Guangxi Guidong Electric Power Co., Ltd., Guangxi Baise Electric Power Co., Ltd., Chongqing Three Gorges Water Conservancy and Electric Power (Group) Co., Ltd., Chongqing Wujiang Electric Power Co., Ltd., Hunan Jinyuan Electric Power Group Co., Ltd., Shanxi International Electric Power Group Co., Ltd., Jilin Local Hydropower Co., Ltd., Guangxi Water Conservancy and Electric Power Group Co., Ltd., Shenzhen Merchants Power Supply Co