Jica Preparatory Survey for Tulehu Geothermal Power Plant

THE REPUBLIC OF INDONESIA PT. PLN (PERSERO) JICA PREPARATORY SURVEY FOR TULEHU GEOTHERMAL POWER PLANT FINAL REPORT (SUMMARY REPORT) September 2011 JAPAN INTERNATIONAL COOPERATION AGENCY WEST JAPAN ENGINEERING CONSULTANTS, INC. ILD CR(1) 11-043 Location of Tulehu Geothermal Field (Ambon Island, Central Maluku Province) Table of Contents I INTRODUCTION .............................................................................................................................. 1 I.1 Study Area ................................................................................................................................... 1 I.2 Background .................................................................................................................................. 1 I.3 Purpose of the Preparatory Survey .............................................................................................. 2 I.4 Scope of the Geothermal Power Plant Development ................................................................... 2 I.5 Executing Agency ........................................................................................................................ 2 I.6 TOR of the Preparatory Survey ................................................................................................... 2 I.7 Survey Schedule .......................................................................................................................... 5 I.8 Members of the Study Team ........................................................................................................ 6 II POWER SUPPLY AND DEMAND IN THE STUDY AREA .......................................................... 7 II.1 Power Supply and Demand in Maluku Province ....................................................................... 7 II.2 Power Supply and Demand in Ambon Island ............................................................................. 8 II.3 Demand Projection ..................................................................................................................... 9 III GEOTHERMAL RESOURCES IN TULEHU FIELD .................................................................. 12 III.1 Review of Existing Data and Information about Geothermal Resources ............................... 13 III.1.1 Current Status of Drilling Operations in Tulehu .............................................................. 13 III.1.2 Exploration Data and Information ................................................................................... 14 III.1.3 MT Survey ....................................................................................................................... 28 III.2 Conceptual Model of Geothermal Resources ......................................................................... 32 III.2.1 Prospective Area .............................................................................................................. 32 III.2.2 Permeable and Impermeable Structures Controlling Geothermal Activity ...................... 34 III.2.3 Conceptual Model ............................................................................................................ 37 III.3 Evaluation of Geothermal Resource Potential in Tulehu ........................................................ 39 IV GEOTHERMAL FIELD DEVELOPMENT ................................................................................. 42 IV.1 Well Productivity and Injectivity ............................................................................................. 42 IV.2 Number of Necessary Wells to Generate 20 MW Power ........................................................ 44 IV.3 Drilling Strategy ...................................................................................................................... 49 IV.3.1 Drilling Targets and Drilling Pads .................................................................................... 49 IV.3.2 Well Specifications ........................................................................................................... 52 IV.4 Plant Construction ................................................................................................................... 59 IV.4.1 Overall Location Plan for Well Pads and Power Plant ..................................................... 59 IV.4.2 FCRS Plan ........................................................................................................................ 59 IV.4.3 Geothermal Power Plant Plan........................................................................................... 61 IV.4.4 Equipment Transportation ................................................................................................ 70 IV.5 Transmission Lines .................................................................................................................. 70 IV.6 Project Cost ............................................................................................................................. 72 JICA Preparatory Survey for Tulehu Geothermal Power Plant Final Reprot (Summary) IV.6.1 Resource Development Cost ............................................................................................ 72 IV.6.2 Cost for Construction of Plant and Transmission Lines ................................................... 76 IV.7 Project Implementation Plan ................................................................................................... 77 IV.8 Confirmation of Project Effect ................................................................................................ 81 IV.8.1 Project Cost Summary ...................................................................................................... 81 IV.8.2 Economic and Financial Evaluation ................................................................................. 82 IV.8.3 CDM Effects .................................................................................................................... 83 V SOCIAL AND ENVIRONMENTAL CONSIDERATIONS ........................................................... 85 V.1 Permissions and Explanations .................................................................................................. 85 V.1.1 EIA and Environmental Permissions ................................................................................. 85 V.1.2 Explanations to Local Stakeholders ................................................................................... 85 V.2 Social Environment .................................................................................................................. 85 V.2.1 Resettlement ...................................................................................................................... 85 V.2.2 Minorities and Indigenous Peoples .................................................................................... 85 V.3 Natural Environment ................................................................................................................ 85 V.3.1 Protected Area ................................................................................................................... 85 V.3.2 Ecosystem .......................................................................................................................... 85 V.4 Pollution Control ...................................................................................................................... 86 V.4.1 H2S ..................................................................................................................................... 86 V.4.2 Noise .................................................................................................................................. 86 V.4.3 Water Quality ..................................................................................................................... 86 V.5 Environmental Check List ........................................................................................................ 86 VI CONCLUSIONS AND RECOMMENDATIONS ......................................................................... 91 VI.1 Summary of Study Results ..................................................................................................... 91 VI.2 Recommendations ................................................................................................................... 92 JICA Preparatory Survey for Tulehu Geothermal Power Plant Final Reprot (Summary) List of Figures Fig. I-1 Study Area ..................................................................................................................... 1 Fig. I-2 Flow of the Preparatory Survey .................................................................................... 4 Fig. II-1 Wilayah Maluku dan Maluku Utara ............................................................................ 7 Fig. II-2 Power Demand for one day (July 14, 2010) ................................................................ 8 Fig. II-3 Revised Demand and Supply Projection for Ambon System (Standard Schedule Version) ............................................................................................................................... 11 Fig. III-1 Quaternary Volcanoes in Indonesia and Nominated Geothermal Fields in Maluku Province .............................................................................................................................. 12 Fig. III-2 Location of Existing Wells and Drilling Site for Exploratory

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