In Power Plant, there are seven Mechanical Main System which is have important role. Total generating capacity of Kamojang Power Plant is 200MW consist of Unit 1, 2, 3 with total of 140MW and 60MW from Unit 4. PGE Kamojang is the first geothermal field which was inaugurated on January 29th 1983. Pertamina (Persero) established since 2006 which utilize geothermal resources to generate electricity in Indonesia. Pertamina Geothermal Energy (PGE) is a subsidiary company of PT. ABSTRAKSI: In the daily life, electricity is a vital thing and something that never released from human activity.