This dataset represents grid electricity supply at voltages below 110 kV in the North China regional power grid, covering Beijing, Tianjin, Hebei, Shanxi, Inner Mongolia, and Shandong. Since infrastructure, emissions, and transmission line losses associated with delivering electricity to end users are already accounted for in the market dataset, the market group dataset is simply a weighted aggregation of individual market datasets within this region. The data primarily originates from official statistics.