INCREMENTAL DEVELOPMENT STRATEGY OF GEOTHERMAL FIELD USING WELLHEAD UNIT TECHNOLOGY: CASE STUDY ULUMBU GEOTHERMAL FIELD

• Main Author: Idianto, Onny
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/48339
• Institution: Institut Teknologi Bandung

Geothermal development in Indonesia is still dominated by the utilization of conventional geothermal power plants with large capacities. It generally requires a long time and often experience delays in the operation process. The purpose of this study is to provide alternative production options for field development with an incremental development strategy. This study is conducted to show the effectiveness of incremental development strategy by using a wellhead Unit compared to conventional power plants by using probibility approach with case study in the Ulumbu geothermal field, East Nusa Tenggara. In addition, this study also provides a comprehensive economic condition of the obtained revenue and project investment costs, therefore geothermal power plant development could be more feasible and minimize barriers to investment value. The methods of this study used technical analysis and economic analysis approach, from total project investment cost for each development strategy and the financial return achieved. Technical analysis is done by comparing the Specific Steam Consumption (SSC) and the amount of capacity to be generated in the power plant. The total investment value is determined using development strategies 40 MW (conventional) scenario 2x20 MW, 40 MW (incremental) scenario 8x5 MW and 40 MW (incremental) scenario 1x2,5 MW using condensing power plant. The results of the economic analysis shows that P50 from investment estimation of each 5,93 ; 5,66 and 5,68 Million USD/MW. Regarding to tariff based 80% under Average Cost of Electricity Generation (BPP) on relevant local grid, P50 Rate of Return result as 16,65%, 17,19% and 17,03%. Evaluation result are determined based on comparison of investment cost, economic parameter, tariff variation and risk assesment, incremental development scenario 8x5 MW and 16x25 MW are feasible as development alternative scenario of Ulumbu field.