Abstract: With the emergence of centralized coal market in large scale,the phenomenon that the coal producers raise up coal market price by exerting their market power will appear naturally,which will raise up the electricity price on grid and electricity sale price.So controling the market power of coal producers can manage the energy price from headst ream.The contract for difference between the coal producer and electricity generator is designed,and then the Cour not model is used to analyze the coal producers producing behaviors and the electricity generators decision behaviors,where the Stackelberg model is used to analyze the generators cooperation behavior.Finally the Shapley principle is applied to present the profits distributing model.The simulation results demonstrate that the contract for difference between the coal producers and electricity generators can promote the coal producers out put,reduce the coal market price and steady the sale capacity.This effects will be enhanced by the generators cooperation.

Key words: contracts for difference, market price, electric coal price, Shapley principle