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Geothermal is vital for sustainably meeting Indonesia's energy demand, given its estimated massive reserves potential equivalent to 24 GW of electricity. The Indonesian government has set geothermal contributions to the national energy mix at 7,241.5 MW by 2025 and 17,546 MW by 2050, despite harnessing such vast potential needing significant investment. To that goal, the government established a feed-in tariff (FIT) mechanism to encourage private sector investment in geothermal development. However, FIT has undergone significant alterations in a short period. Moreover, various complicating factors—bureaucracy, social, and technical—exist alongside FIT implementation. Therefore, the extent that FIT can effectively enhance geothermal development in Indonesia should be challenged with further investigation. This study explores the efficacy of FIT policies for geothermal electricity by comparing the performance of several FIT schemes in terms of their impact on the government's target achievement. This study combines the policy analysis framework with system dynamics modeling to understand the dynamic interaction of FIT policy and other important components in geothermal development. The findings show that modest bureaucracy and public support are required. Furthermore, to enhance geothermal development more effectively, FIT should be at least 11 cents US$/kWh and accompanied by technical breakthroughs and government-funded exploration activities., Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public., Policy Analysis

Geothermal is vital for sustainable energy systems development in Indonesia. The country is privileged with estimated geothermal reserves equivalent to 29 Gigawatt-electric. However, harvesting such massive potential is precarious since geothermal projects are capital intensive, complex, and sensitive to uncertainties and risks - -thus, the projects become a less attractive investment. Moreover, due to deep uncertainties, difficult decisions often have to be made regarding geothermal projects (dis)continuation for financial reasons. Additional governance measures, such as sustainable financing, are required to ensure the viability of the projects in the long run. In order to address this concern, this study proposes a conceptual framework that can be used to develop a sustainable financing model for geothermal projects. Notably, the conceptual framework is developed for exploring alternative financing schemes that are robust and attractive when faced with uncertainties and risks during the projects. For this purpose, the study employs the exploratory system dynamics modeling and analysis (ESDMA) approach and introduces the exploratory financial modeling and analysis (EFMA) approach. ESDMA analyzes geothermal project complexity and explores robust policies under deep uncertainties, while EFMA analyzes the project's financial performance and explores robust-attractive financing schemes under deep uncertainties. Aligning the results from both approaches, a sustainable financing model for geothermal projects is formulated.

Natural gas vehicles (NGV) face significant adoption barriers in Jakarta. Therefore, a successful transition requires measures from the government. Owing to the high cost of transition policies, the efficacy of these policies must be analyzed to identify the most effective policy. The implementation of transition policies, however, could dynamically influence people's perception and behavior, which then changes the landscape of adoption barriers. Furthermore, even a seemingly successful policy may fail when a certain pathway of uncertainties emerges in the future. To address these concerns, we integrated agent-based modeling, exploratory modeling, and diffusion of innovation theory into the exploratory model-based diffusion analysis approach. This approach evaluates the policy's performance, explores changes in the relative importance of different adoption barriers, and identifies policy vulnerabilities, i.e., scenarios leading to policy failures. We tested this approach on four NGV transition policies targeting three adoption barriers. We found that the importance of adoption barriers and the critical uncertainties upon the implemented policies. The social–behavioral barrier predominates under current conditions, whereas the economic factor becomes more relevant when all policies are executed. Understanding the changes in adoption barriers and policy vulnerabilities will help decision-makers to prepare additional measures that ensure a successful transition., Policy Analysis