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This paper presents the results of a long-term performance analysis of PV-hybrid system based on 5 years operational data from the field site of Noyon soum, Umnugobi province, Mongolia, project supported by New Energy and Industrial Technology Development Organization of Japan (NEDO). The NEDO has performed demonstrative research on the independent dispersed PV-hybrid systems: PV, 200 kW, DEG (Diesel Engine Generator): 100kVA*3set) from 2002 to 2004 in Mongolia. The main purpose of this project was to improve system reliability and cost performance on the natural conditions and distinctive social systems, which are rarely seen in Japan. It has been observed that the high PV penetration (during project period: 80.4% during 09/2003-12/2007) 71% of total supplied energy, and the low system failure ratio. On the other hand, average PR (performance ratio) indicated 0.20 (during project period), 0.14 (estimated values between 09/2003-12/2007) due to the limited demand and distributed/grid-connected PV units (100kW) with the auxiliary power mode.