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The electric energy saving system (EESS) for enterprise and city is proposed in this paper, which consists of three parts: electric energy saving equipments of high voltage, electric energy saving equipments of low voltage, and real-time reactive power optimal compensation. Three novel electric energy saving technologies are presented: high-quality hybrid var and harmonic compensator (HVHC) for high-voltage distribution network; low-cost and high-efficiency hybrid var compensator (HVC) for low-voltage distribution network; real-timely global optimization system of EESS. The characters of the three novel energy saving technologies are analyzed, respectively. Industrial practical effects confirm that the proposed EESS effectively solves the problems of electric energy saving in distribution network and ensures its operation securely and stably, as well as decreases the loss of electric energy greatly.