The electricity industry in Indonesia is an important sector for the whole society. System reliability index is one of the things that need attention. Therefore, this study analyzes the reliability of the 20 KV system at the Kacer Feeder Seduduk Putih Substation using calculation of SAIFI, SAIDI, CAIDI, ASAI, and ASUI index obtained from using Failure Modes And Effect Analysis method, where the…