Abstract This paper presents a basic model for a highly efficient and integrated energy supply system by constructing a network of many kinds of energy and power supplies to several buildings. This system consists of distributed power sources, for example, CHP, fuel cells, solar cells and heat storage systems in addition to the conventional power supply systems. We focus mainly on the information and control system. Such an energy system will be large scale and complicated. Therefore, it is important to combine a supplier directly with the consumers through an information-communication network and to control each energy supply dynamically.