This market group dataset represents consumable electricity with voltage levels of ＞35 kV (i.e., high voltage) 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 220 kV and above, and 110 kV electricity markets. Data are mainly from official statistics and public literature.