Kamojang Geothermal Power Plant Unit-1 : 30 years of Operation

Abstract

UNIT-1 KAMOJANG geothermal power plant marked the new era of renewable energy in Indonesia. With its built capacity of 30 MWe, it constantly supply electricity to Java- Bali grid for more than 30 years now. Over those period, Unit-1 has given its best performance with highest achievement on Capacity Factor (CF) and Equivalent Availability Factor (EAF). High performance geothermal power plant involves the integration not only from the point of view of power generation, but also the optimation of geothermal potention in the area. Kamojang geothermal field, which is considered as one among five steam dominated reservoir in the world produces 200 MWe of the electricity nowadays. In order to maintain this production rate, some technical consideration must be made. Towards sustainable power generation of geothermal power, some assessment has been made to turbine, generator and cooling tower to ensure its current condition. Basically what it called remaining life assessment gives a rough picture of how long the equipment will run through in its operational condition. Based on those assessment, additional 20.900 hours is given to the turbine with the existing operating conditions. The above life expectancy analysis is done with a confidence level of 80%. On the other hand, cooling tower infrastucture test and simulation delivers operation period for another 25 years.