Most power supply enterprises have established EMS， TMR， LMS and MIS， but these systems can't share information efficiently. This paper develops the real-time data center system（RtDC） based on the PI. The successful application of RtDC effectively solves the“information islands” barriers issues，and makes enterprise real-time data efficiently and easily access. It not only provides a powerful real-time data platform for power supply enterprise information system， but also provides a strong technical support for production scheduling， operation management， marketing and business decisions. The current situation of automation and information systems and the characteristics of PI database are analyzed，then the architecture， functions and crucial technical issues of power supply enterprise RtDC are discussed. Finally this paper introduces the practical application of RtDC in Shenzhen Power Supply Bureau.