Indonesia is aiming to become the world’s largest geothermal energy producer, according to Eniya Listani Dewi, Director of New and Renewable Energy and Energy Conservation of Indonesia, in her meet-the-press presentation during the 11th Indonesia International Geothermal Convention and Exhibition on April 14, 2025, in Jakarta.
Indonesia is the world’s second-largest geothermal energy producer, with a total installed capacity of 2680 MW, while the US is the largest, with 3937 MW.
Indonesia, which has 40% of the world’s geothermal potential, hopes to add 1.1 GW of geothermal capacity in the next five years.
Here are geothermal companies that are actively expanding their geothermal assets in Indonesia.
KS Orka Renewables
KS Orka Renewables added a new geothermal power station in December 2024—the 33-MW Sorik Marapi Unit 5. This power station is operated by Sorik Marapi Geothermal Power, a subsidiary of KS Orka Renewables. With this new station, the total installed capacity of the five Sorik Marapi power stations in North Sumatra increased to more than 200 MW.
Medco Cahaya Geothermal
PT MCG started commercial operations of the 35-MW Ijen geothermal power plant in February 2025, the first geothermal power plant in East Java. Medco Cahaya Geothermal is a joint venture between Medco Power Indonesia and Ormat Technologies.
Star Energy Geothermal
Star Energy Geothermal added 15.5 MW of installed power generation capacity from its new Salak binary plant in West Java. With this expansion, the company boasts a total installed capacity of 901.5 MW, making it Indonesia’s largest geothermal power plant operator.
Star Energy Geothermal is also working on increasing power generation capacity in its Darajat and Wayang Windu plants.
The company has secured financing to retrofit its Wayang Windu Units 1 and 2 to enhance their capacity by 18.4 MW and to build a 30-MW Wayang Windu Unit 3 power plant.
Pertamina Geothermal Energy
Pertamina Geothermal Energy is expected to complete its new 55 MW Lumut Balai Unit 2 power plant in May 2025. The company also has plans to start exploration drilling this year in the Seulawah Agam Geothermal Working Area at Aceh, a joint project with PT Pembangunan Aceh (PEMA).
Geo Dipa Energi
Geo Dipa Energi looks forward to adding a new geothermal power plant, the 55-MW Patuha Unit 2, in 2027. Toshiba ESS will supply the steam turbine, generator, and auxiliary equipment. The expansion will double the Patuha power generation capacity to 110MW.
Geodipa is also working on adding a second power station in the Dieng area. The company aims to increase its installed capacity to 1100 MW in 5 years.
Supreme Energy
Supreme Energy Muara Laboh, a joint venture company of Supreme Energy, Sumitomo, and Inpex, plans to complete the 80 MW Muara Laboh Unit 2 in 2027. Supreme Energy also operates the 91.2 MW Rantau Dedap geothermal power plant.
PLN
Perusahaan Listrik Negara, Indonesia’s national power company, has started the Atadei Project to develop a 10-MW geothermal power plant in the Atadei work area, and is acquiring land to drill two wells.
The Atadei geothermal work area is on Lembata Island in East Nusa Tenggara (NTT).
This article is written by Jamin Djuang based on information provided by various sources including ThinkGeoEnergy and Geoenergis.
