To deal with environmental problems such as global warming and depletion of energy resources, energy conservation measures in the civilian sector and the spread of renewable energy are required strongly. As a next-generation energy system to achieve them, Cluster Energy Management System (CEMS) is beginning to be studied in Japan. CEMS is the energy management system, which cooperates with various dispersed power sources and buildings using information technology. CEMS monitors and adjusts energy supply and demand in real-time to form the best combination of them, and achieves high efficiency energy usage. In this study, the electricity energy measurement system using KNIVES (Keio University Network oriented Intelligent and Versatile Energy saving System) was build in Keio University Shonan Fujisawa Campus (SFC). In addition, it is declared that this system can predict electric power demand based on the past data obtained from itself.