Multi-Dimensional Analysis of Power Supplier Bids in Interprovincial Electricity Markets

Power suppliers and consumers are the main participants involved in transactions of electricity market, whose bidding strategies are related to the operation of the entire electricity market. In this paper, the real-world data from a recent transaction in the interprovincial electricity market in China was analyzed. By using the capacity and price index (CPI) and herfindahl-hirschman index (HHI), the bidding behaviors of each province and its impact on the market price were analyzed. The results show that each province as a power supplier has different resource endowments, and there exists great difference among decisions of different provinces in power generating and bidding strategies. Moreover, some provinces as power suppliers occupy most market share, which has a decisive impact on the overall market price level, leading to a high degree of market concentration.