Therefore, some measures should be taken to deal with the time varying nature and uncertainty of the output of PV and WT generation when they are largely installed. We proposed the novel method to allocate control depending on individual response characteristics of fossil-fired thermal power generation or batteries. Then, the new control method of EDC to mitigate the effect of the prediction error for the output of PV and WT generation is also proposed. Moreover, the effectiveness of proposed methods is examined by the simulation of power supply and demand control. Power supply and demand control system should be improved for large-scale installation of renewable energy, as proposed in this paper.