This dataset represents medium-voltage (>1, <=35 kV) grid electricity supply within a specific regional power grid. As the infrastructure, emissions, and transmission and distribution losses associated with electricity delivery to end users are already accounted for in the underlying market datasets, this market group dataset represents a weighted aggregation of individual market datasets within the region. Here, the medium-voltage electricity market is derived from a weighted combination of the 35 kV and 10 kV electricity market datasets. The data are primarily derived from publicly available literature.