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According to Japanese governmental target, more than 50 GW will be penetrated on the whole utility system until 2030. Such large penetration of PV system may cause deterioration of power quality and stability of the whole utility grid. CRIEPI is promoting a study of future Japanese style smart grid called “Triple I (Intelligent, Interactive, Integrated) Power System (TIPS)” to keep stable and to promote effective energy use under the large penetration of unstable renewable power sources. In the study, new integrated control technique of supply and demand for utilizing surplus power due to PV systems that may cause instability of the grid is being investigated. Concept of surplus power control method in whole utility system including demand control is revealed. A new operation planning method of load in each customer having PV system taking account of satisfying both utility requirement and customer convenience is designed and verified by simulation.