Under the environment of energy internet, the power supply-demand market presents a more remarkable trend of smartness and openness; meanwhile, the power suppliers also face a more diversified and competitive situation. Considering the coexistence of multiple power suppliers in a region, this paper analyzes the competitive behavior among different entities, and formulates the competition among them as a potential game. Meanwhile, a dynamic pricing strategy is designed to stimulate the interaction between users and power suppliers, with the goal of users-centered, market-oriented, market main bodies’ satisfaction maximizing marketing. Simulation results demonstrate that the proposed competitive model can help power suppliers to be more rational, and also can promote the utilization of user-side controllable load.