Worldwide the demand on a higher level of automatic control of power systems rises to comply with system objectives of reliability, efficiency, cost minimization as well as emission requirements. With the transition of the power systems towards a more volatile on-site generation based on renewable resources, a higher degree of flexibility in energy consumption for reduced system congestion is evident. This paper presents a real-time information system for active control of the demand side in Japanese power grids. The proposed system allows local data processing of environmental and consumption data to schedule and curtail loads of shops, small and medium size enterprises. The concept comprises specialized control hardware for end-use supervision, local and internet based server architecture and control methods for global energy management.