The generation rights trade has important significance to implement energy-saving dispatching. In order to analyze the generation rights trade from the prospective of coal consumption， a variable called coal consumption rate is defined. With this variable， based on the optimal efficiency of trade model， a trade model for the optimization of energy consumption is proposed. Combined with the optimal model of efficiency and coal consumption， a weighted-optimal-model is proposed as well. For the objective of energy-saving， the influences of the models with different weighted factors are discussed in the Shanghai Power Grid. The results of case study show that the generation rights trade can reduce coal consumption and increase social efficiency as well.