Abstract
In the past, the energy system in a building and group of buildings was determined mainly on the basis of economical rationality on the side of consumers, but the present research has helped to clarify the concept of "energy management". It has been attempted to establish this concept as a practical business method for constructing an energy system aimed at effective use of energy and natural resources, that is, their saving and increasing economical effects. Also, this concept premises a "unified energy system" by coordinating the consumer side with the supplier side, as well as considering the special characteristics of various types of energy supplied to buildings. This report presents the construction method of energy-system unification based on energy management, discusses cases of urban development projects and clarifies the validity of the best mixed system.