From the perspective of social welfare, this article constructs an optimization model for the default electricity price of operational users based on maximizing social welfare, considering the power and price levels on the user side and the power generation side. The constraints such as power generation and consumption balance, pollutant emissions, renewable energy consumption, electricity marketization process, and cross-subsidy are comprehensively incorporated. By solving the proposed model using the actual data of a certain province, the default electricity price levels of users of different voltage levels during peak, flat, and valley periods are obtained, showing that the default electricity price level of operational users which maximizes social welfare is significantly reduced to a certain extent compared with the electricity price level of the current sales catalogue.