Jan 07 2022


Jakarta, 7 January 2022

PT. Supreme Energy Rantau Dedap (SERD), a joint venture of PT. Supreme Energy, ENGIE, Marubeni Corporation and Tohoku Electric Power announces the Commercial Operation Date of Phase-1 Rantau Dedap Geothermal Power Generation with the capacity of 91.2 MW on December 26th, 2021. The Rantau Dedap geothermal power plant is located in Muara Enim Regency, Lahat Regency and Pagar Alam City, South Sumatra Province. This electricity sourced from green CO2 emission free energy will be dispatched to PT. PLN (Persero) Sumatra grid transmission to support the reliability supply of electricity in Sumatra area.

PT. Supreme Energy started the preliminary study in 2008, signed the Power Purchase Agreement (PPA) in 2012 and started with exploration activities immediately until 2015. Upon completion of PPA Amendment at the end of 2017 and reached financial closed in 2018, construction and well drilling for development phase were commenced. SERD appointed PT Rekayasa Industri and Fuji Electric consortium as EPC Contractor. Total investment for Rantau Dedap Phase-1 development was more than USD 700 million.

"Rantau Dedap project is the most challenging geothermal project due to its remoteness with steep terrain, high elevation (2,600 masl) and constructed in the midst of Covid-19 pandemic. It shows again a very strong commitment of PT. Supreme Energy and its partners toward the development of Geothermal Energy in Indonesia to support the Government of Indonesia achieving energy transition objective” the Founder & Chairman of PT. Supreme Energy, Mr. Supramu Santosa said.

Currently, Supreme Energy is also operating 86 MW Muara Laboh Geothermal Power Plant Unit-1 under PT. Supreme Energy Muara Laboh (PT. SEML), in West Sumatra Province, which is already operated since December 2019. Two Supreme’s projects in the pipeline, the development of Muara Laboh Geothermal Unit-2 80 MW and exploration phase of Rajabasa Geothermal Power Plant 2 x 110 MW in Lampung Province under PT. Supreme Energy Rajabasa (SERB), are currently awaiting for PPA Amendment agreement with PT. PLN (Persero). SEML is a joint venture of Supreme Energy, ENGIE and Sumitomo formed in 2011. INPEX later joined the venture in end of 2021. SERB is a Joint Venture company comprises of PT. Supreme Energy, ENGIE and Sumitomo Corporation.

About Supreme Energy

PT Supreme Energy was founded in 2007 by professionals with long experience and knowledge in energy sector in Indonesia, and directly involved in the oil and gas industry and geothermal development and operations for the past 40 years. Supreme Energy signed a PPA in 2012 for the development of three geothermal working areas, and is one of the pioneers of a private geothermal power producing company in Indonesia.


ENGIE is a global reference in low-carbon energy and services. In response to the urgency of climate change, their ambition is to become the world leader in the zero carbon transition of their customers, in particular businesses and local authorities. We rely on our key businesses (renewable energy, gas, services) to offer competitive turnkey solutions "as our service". With 160,000 employees, customers, partners and stakeholders, ENGIE is a community of Imaginative Builders, committed every day to more harmonious progress. Turnover in 2020: 55.8 billion Euros. ENGIE Group is listed on the Paris and Brussels stock exchanges (ENGI) and is represented in the main financial indices (CAC 40, DJ Euro Stoxx 50, Euronext 100, FTSE Eurotop 100, MSCI Europe) and non-financial indices (DJSI World, DJSI Europe and Euronext Vigeo Eiris - World 120, Eurozone 120, Europe 120, France 20, CAC 40 Governance).

About Marubeni Corporation

As a global corporation that engages in diverse business activities, Marubeni commits to promote environmental consideration into all business activities around the globe, including in Indonesia. Marubeni’s business activities should be conducted in consideration of their possible impact on the environment. In Indonesia, Marubeni attempts to support Indonesian government in promoting environmentally friendly project by establishing some clean energy projects. Marubeni has developed geothermal power projects in Indonesia as part of the company’s commitment to preserve environment i.e. PLTP Patuha Unit 1 (1x55 MW), PLTP Lumut Balai (1x55 MW), PLTP Kamojang Unit 2 & 3 (2x55 MW) and PLTP Rantau Dedap (2x46 MW). Marubeni believes that sustained growth is a realistic goal which can be achieved, in line with Marubeni’s spirit which consists of Fairness, Innovation, and Harmony. Therefore, Marubeni will strive to practice sound management that can coexist with the society and the environment, especially in Indonesia where Marubeni does a diverse business activity.

About Tohoku Electric Power

Tohoku Electric Power Co. was founded in 1951, a time when Japan was finally emerging from the post-war turmoil. Since then, Tohoku has been working together with the six prefectures of the Tohoku region and Niigata Prefecture, with a mission to provide quality services while maintaining a sense of mission regarding their role as a public utility. Tohoku supplies high quality, reliable power and contribute to the development of local communities. Tohoku combines multiple energy sources for power generation, including thermal, hydroelectric, geothermal, and solar energy, in such a way that ensures a steady and affordable electricity supply. Tohoku Electric Co. is committed to optimizing their energy mix to provide stable inexpensive electricity generated from green energy. Tohoku Electric Co. has also joined overseas projects. They have invested in the Rantau Dedap Geothermal Power Project in Sumatra, Indonesia, in February 2018, the first geothermal power generation project they have ever participated in.