Integrated Field Management Program Implementation for Energy Efficiency Improvement in Star Energy Geothermal Darajat Unit II and Unit III Power Plants

Abstract

Star Energy Geothermal Darajat II, LIMITED (SEGD II) operates steam field and two power plants, Unit II and III with capacity of 95 and 121 MW respectively and provides steam for Unit I which is operated by PT Indonesia Power. To ensure a reliable and sustainable power plant operation, SEGD II implements integrated field management program that is composed of Real Time Simulation Technology (RTST) and Decision Support Center (DSC). This program offers data processing system, real-time analysis, and collaborative decision-making process; in 2014, it was the first of its geothermal application in the world. Through this integrated program, within the first five years of its implementation, SEGD II succeeded in improving energy efficiency (energy savings) and energy conservation (additional steam reserves) equal to production of 4 wells, which in turn deferred the need for make-up well drilling by 5 years providing saved capital expenditure of USD 40 million. The program also has a potential of confirming additional 9.5 GWh energy saving opportunity from more efficient power plant operation (lower steam consumption). Utilization of appropriate technology that goes hand in hand with effective collaboration between operations, Facility Engineering and sub-surface departments has been successful in supporting the implementation of energy efficiency programs in SEGD II.