Reliability is an important factor in the operation of network distribution system. Some of the parameters that can be used as references to determine the reliability of a distribution system are System Average Interruption Frequency Index (SAIFI), System Average Interruption Index (SAIDI), Customer Average Interruption Index (CAIDI), Average System availability Index (ASAI), and Average System Unavailability Index (ASUI). Based on the calculation and analysis it can be found that the reliability value index of BTG06 feeder was categorized as less reliable because the SAIFI and SAIDI value exceed the maximum limit specified by IEEE. The performance of the system in PLN Batang subdistrict considered less reliable because of the SAIFI and SAIDI value exceed the maximum limit specified by WCS and WCC.