PT Supreme Energy Rajabasa (SERB), a joint venture between Supreme Energy, Sumitomo Corporation, and INPEX Corporation, manages the Gunung Rajabasa Geothermal Working Area (WKP) located in South Lampung, Sumatra. The concession area covers approximately 19,250 hectares and is estimated to have a development potential of up to 2 x 110 MW.
The Gunung Rajabasa geothermal project is included in Indonesia’s Electricity Supply Business Plan (RUPTL) 2025–2029, underscoring its strategic importance in supporting the national energy transition and the expansion of renewable power generation capacity.
The project is currently in the exploration stage, with ongoing activities focused on technical studies, permitting, and commercial arrangements necessary to support future development. Since the establishment of the working area in 2009 and the issuance of the geothermal license in 2015, the project has progressed through various regulatory and preparatory phases in line with prevailing national policies and industry practices.
SERB continues to advance key permitting processes and technical evaluations to strengthen project readiness. In parallel, discussions related to the Power Purchase Agreement (PPA) with PT PLN (Persero) are ongoing as part of the standard process toward project development. The company also maintains active engagement with relevant stakeholders to ensure alignment with regulatory requirements, community considerations, and environmental standards.
To support future implementation, SERB has conducted additional studies to further refine the development concept and identify the most efficient and responsible approach for the project. These efforts provide a stronger foundation for investment decisions and long-term project sustainability.
Looking ahead, SERB remains focused on completing the PPA process, targeted for 2026, while continuing to enhance technical, regulatory, and stakeholder readiness. With these ongoing efforts, the Gunung Rajabasa project is expected to progress toward development and contribute to Indonesia’s growing portfolio of clean and reliable geothermal energy.
