Ranking of Indonesian Geothermal Systems

Abstract

Ranking of explored Indonesian geothermal prospects provides realistic estimates for ongoing and planned development of prospects suitable for economic production of electric power. Ranking starts with a classification of prospects allowing for quality of exploration data and status of exploratory drilling. The potential of 57 explored and partly developed Indonesian geothermal prospects (2010/11 status) was assessed by dividing them into: developed and producing fields (n=7), fields with known reserve status (n=17), explored prospects (green fields) but not proven by exploration drilling (n=23), and partially explored prospects (blind green fields, n = 10). Most of the 57 prospects have been earmarked by the Indonesian Government for accelerated development in the Permen 15/2010 directive. This aims for an increase of c. 4,000 MWe in new installed capacity by the end of 2014 and would involve c. 40 prospects which are included in our classification. Fourteen fields with known reserve status were selected for evaluation and were ranked according to their electric power potential (Pe) and estimates of their levelized costs of electricity (LCoE). The suitability of these fields for the planned accelerated development of geothermal power can be assessed from the evaluation.