| Abstract |
ABSTRACT Nearly 300 potential high to low-enthalpy geothermal areas have been identified across Indonesia. Recent estimates of the possible power production from these geothermal resources exceeds 29,000 MWe. This number has been obtained by adding all of the estimated geothermal potential resources and reserves classified as "speculative, hypothetic, possible, probable, and proven" from all sites where such information is available. However, this approach to estimating the geothermal potential is flawed because it includes double counting of some reserve estimates as resource estimates, thus giving an inflated figure for the total national geothermal potential. A previous paper (Fauzi, 2013a and b) redefined and revised the geothermal resource estimate for Indonesia using a more realistic methodology. The potential geothermal resources and reserves for Indonesia are estimated to be about 24,000 MWe. This estimate can be classified as either (1) potential high-enthalpy resources suitable for conventional steam turbine power plants or (2) low-enthalpy resources better suited for binary power plants or other. Understanding the type of potential power plant is important to stakeholders, especially investors who are not familiar with the geothermal industry. Publically-available data were reviewed to determine whether a site is potentially a high-enthalpy or low-enthalpy resource. The resource classification was based on: (1)location (e.g. volcanic or non-volcanic), (2)the type of surface thermal features, and (3)the estimated reservoir temperatures. The results of the review suggest that approximately 14,500 MWe of the total estimated geothermal resources for Indonesia may be considered as high-enthalpy resources (conventional steam turbine power plants) and 9,500 MWe of the total estimated geothermal resources are lower enthalpy resources more appropriate for binary power plant applications or other direct use applications. |