IGA Workshop on “Developing Best Practice for Geothermal Exploration and Resource / Reserve Classification” Essen, Germany , 14 November 2013

Current Status of Estimates and Classification of Geothermal Potential in Indonesia by. Suryantini (INAGA)

IGA Workshop on “Developing Best Practice for Geothermal Exploration and Resource / Reserve Classification” Essen, Germany , 14 November 2013

Outline • Current Status of Geothermal Estimated Potential • Geothermal System Classification • Potential Calculation • Concluding Remark

IGA Workshop on “Developing Best Practice for Geothermal Exploration and Resource / Reserve Classification” Essen, Germany , 14 November 2013

Current Status of Geothermal Estimated Potential (2004)

IGA Workshop on “Developing Best Practice for Geothermal Exploration and Resource / Reserve Classification” Essen, Germany , 14 November 2013

Current Status of Geothermal Estimated Potential (2011) Total of 29.308 MW from 276 prospects : Jawa Sumatera Bali-Nusa Tenggara Kalimantan Sulawesi Maluku Papua

(71 Prospects, Resources 3771 MW), (86 Prospects, Resources 6871 MW), (27 Prospects, Resources 769 MW), (8 Prospects, Resources 115 MW), (55 Prospects, Resources 992 MW), (26 Prospects, Resources 578 MW) (3 Prospects, Resources 75 MW).

IGA Workshop on “Developing Best Practice for Geothermal Exploration and Resource / Reserve Classification” Essen, Germany , 14 November 2013

Installed Capacity (MEMR, 2013)

Power Plant

Installed Capacity (MWe)

Sibayak

12

Salak

377

Wayang Windu

227

Kamojang Darajat

200 270

Dieng

60

Lahendong - Tompaso

80

Ulubelu

110

Ulumbu

5

Total

1341 MWe

IGA Workshop on “Developing Best Practice for Geothermal Exploration and Resource / Reserve Classification” Essen, Germany , 14 November 2013

Geothermal System Classification and Estimated Potential Classification • No Particular Classification for the Geothermal System. • Common classification used are: Based on Reservoir Temperature (Hochstein, 1990; Hochstein and Browne, 2000); High Temperature/High Enthalpy ( >225C) Medium Temperature/Medium Enthalpy (125C – 225 C) Low Temperature/Low Enthalpy ( 1 proven exploration drilling

IGA Workshop on “Developing Best Practice for Geothermal Exploration and Resource / Reserve Classification” Essen, Germany , 14 November 2013

Potential Calculation

Volumetric Method SNI 13-6171-1999 ICS 73.020 Metode Estimasi Potensi Energi Panas Bumi

IGA Workshop on “Developing Best Practice for Geothermal Exploration and Resource / Reserve Classification” Essen, Germany , 14 November 2013

Potential Calculation Calculation of Hypothetic Resources and Reserves Calculation of Reservoir Energy at Initial Condition (MWth), =10% SL=100%

Calculation of Reservoir Energy at Final Condition (MWth) assume 180C =10% SL=100% Utilizable Maximum Energy (Resources)

(MW th)

Recoverable Reserves is Recovery Factor multiply by Resources (MW th) SNI 13-6171-1999 ICS 73.020 Metode Estimasi Potensi Energi Panas Bumi

IGA Workshop on “Developing Best Practice for Geothermal Exploration and Resource / Reserve Classification” Essen, Germany , 14 November 2013

Potential Calculation Calculation of Hypothetic Resources and Reserves • Recoverable Reserves For a Period of time (t) (Assumption is 30 Years) (MWth)

•Electrical Potential Energy (Mwe)

 Electrical Conversion Factor Low and Med Temp 10%, high Temp 15% SNI 13-6171-1999 ICS 73.020 Metode Estimasi Potensi Energi Panas Bumi

IGA Workshop on “Developing Best Practice for Geothermal Exploration and Resource / Reserve Classification” Essen, Germany , 14 November 2013

Concluding Remark

• The method discussed above is used by Geological Agency MEMR to report the Indonesian Geothermal Potential to the public • The potential is stated as net electrical power or as MWe • The method is available in SNI (Indonesian National Standard). There are 3 (three) SNI available for geothermal potential classification : 1) Indonesian Geothermal Potential Energy Classification, 2) Estimation Method for Geothermal Potential energy and 3) Parameter Value in Estimating geothermal potential energy • However this SNI is on the process for the revision; reservoir thickness, initial and final temperature, Power density, Energy Conversion Factor etc. • The potential classification has already incorporating geological risk by considering the stage of geothermal survey. However no detail limitation is mentioned. For example; what happened if the data of the survey is poor? Will it be still useful or the classification rank is going down. • Sometimes the term that data is enough is unclear. • Official classification for geothermal system based on the Geological Setting is not yet available.

IGA Workshop on “Developing Best Practice for Geothermal Exploration and Resource / Reserve Classification” Essen, Germany , 14 November 2013

Reference • MEMR, 2013, UP-DATE ON GEOTHERMAL ENERGY DEVELOPMENT AND UTILIZATION IN INDONESIA, ppt slide • SNI no 13-5012-1998 ICS 73.020 • SNI no 13-6171-1999 ICS 73.020 • SNI 13-6482-2000 • http://www.ebtke.esdm.go.id/id/energi/energi-terbarukan/panasbumi/218-potensi-panas-bumi-indonesia-bertambah-besar.html • http://psdg.bgl.esdm.go.id/kolokium/Makalah%20Umum/1.%20Ma kalah%20PB%20Potensi%20dan%20WKP%20Panas%20Bumi.pdf