This market group dataset represents consumable electricity with voltage levels from 1 to 35 kV (i.e., medium level) in China Southern Grid (CSG), including Guangdong, Guangxi, Yunnan, Guizhou, and Hainan. Since the infrastructure, emissions, and line losses in the process required for electricity transmission to the end user have been considered in the market dataset, the market group data set is a consolidation of different market datasets within the region. Here, the medium voltage electricity market group is a weighted consolidation of the 35 kV and 10 kV electricity markets. Data are mainly from official statistics and public literature.