| Abstract |
Indonesia has abundant resources of geothermal in the world since it is located in ring of fire. According to Indonesia Ministry of Energy and Mineral Resources, it has total potential of 27 GWe which is spread across 252 location such as Java, Sulawesi, Sumatera, Bali and Nusa Tenggara. Reconnaissance survey was undertaken in 1960s and identified that it has potensial high-temperature system criteria of discharge thermal fluid (Hochstein & Sudarman, 2008). Over 35 years of developing geothermal energy in Indonesia, PT. Pertamina Geothermal Energy, a subsidiary company of PT. Pertamina (also known as PGE), encounters several eras of technology. Starting development by 1983, the first 30 MW geothermal power plant (Unit 1) was commercially operated in Kamojang Field, West Java and followed by Unit 2 & Unit 3 which were started 2x55 MW electricity five years later. The steam for those power plants was supplied from 38 wells using approximately 13km length of pipeline and the monitoring program held at the moment were performed manually using analog instruments. By 1993-2003, monitoring system gradually transformed from analog to digital technology and in 2005, maintenance program was initially implemented using risk based inspection. By 2008, Additional 60 MW Unit 4 was energized and increased field production to 200 MW. At the moment, maintenance program was started using Maintenance Performance-Based Maintenance Decision Support System (MDSS) and integrated with supply chain and logistic management. Sever years after that, Fifth geothermal power plant (Unit 5) in Kamojang field was generated In 2015 and at the same year, Reliability Centered Maintenance (RCM) based Maintenance Program for both steam gathering system and power plant was launched for both steam gathering system and power generation facilities to ensure that the system continue to do as the requirement in their present operating context. The latest technology for maintenance program was held by the early 2018 where Android based Seamless Asset Management System (SAMS) are applied to reduce paper-based and time consuming monitoring system. Not only in Kamojang, Geothermal were also utilized in other field in Indonesia. They are Sibayak Field, North Sumatera that generate 12 MW; Ulubelu Field, Lampung that produce 4x55 MW; Lahendong Field, North Sulawesi that has 6 units of 20 MW power plant respectively and also Karaha Field, West Java that energize 30 MW. So in total, PGE has develop 617 MWe geothermal energy and these units has an important role in developing operation and maintenance best practice in geothermal industry in Indonesia |