Energy poverty remains a key global challenge. In Indonesia, around 25 million people are still without electricity access, and many of them live in geographically isolated areas and remote places that preclude them from access to the electricity grid. Deploying renewable energy sources in these areas could present an opportunity for a remarkable and rare complementarity between energy security, energy access, and climate change mitigation. This article examines how energy trilemma plays out in mobilizing private climate finance for renewable rural electrification in Indonesia. Analysis of relevant documents combined with interviews at local and national levels reveals that multiple barriers persist constraining the mobilization of private climate finance to support renewable rural electrification in Indonesia. In turn, this has led to difficulties with managing the tensions and reaching the complementarity of the three key energy objectives. The article concludes with some recommendations for moving forward.Sustainability 2020, 12, 1603 2 of 18 its commitments under the Paris Climate Agreement, will require rapid adoption of renewable energy for power generation. Within Indonesia, nearly 25 million people still lack access to electricity, many on outlying islands or other remote areas where logistical problems, and a sparsely distributed population preclude grid-based solutions [6].Until recently, diesel generators have been viewed as a standard rural electrification solution. However, with Indonesia's commitment to reduce carbon emissions and meet its Paris Climate Agreement target, such generators, too, become far less attractive. An opportunity now exists in such remote areas to achieve the triple goals of reducing energy poverty, ensuring energy security, and mitigating climate change by leapfrogging fossil fuel based energy solutions and embracing technologically advanced and increasingly cheap renewables technology (i.e., zero-carbon electricity expansion).However, here, a major obstacle becomes apparent, namely that providing solar or wind-based power on any scale, like other low carbon initiatives, requires considerable amounts of finance. Public finance and overseas development aid are significant, but a large gap will still exist between what they can deliver and what is needed even if they are increased. Therefore, mobilizing private climate finance for renewable energy generation to scale will be crucial in enabling Indonesia to meet its renewable energy goal and provide electricity access to those living in energy poverty.Accordingly, this article's concern is with privately financing renewable energy and mitigating energy poverty on such islands and in other remote areas. In particular, it addresses compelling policy and governance questions: What are barriers to mobilize private climate finance to support renewable energy uptake for rural electrification? What are the implications of these challenges to mitigate the energy trilemma? Under what conditions might the mobilization of private climate f...