The energy network technology is needed to maximize energy efficiency through optimal matching of demand with supply and utilization of unused energy. It is expected to maximize the energy availability and minimize the exergy loss. Demonstrative researches have been considered for the headquarters of KIER (Korea Institute of Energy Research). As the first stage of energy network research, an integrated energy monitoring centre is developed. KIER uses various types of energies and it also has its own coal-fired power plant. Most of the energy-related facilities and devices are made without consideration of information exchange. Common protocol is selected and devices are connected on the internal network. A web-based monitoring system is developed and data base structure is composed to make web-based EMS possible. This information infra will be beneficial for further demonstrative researches.