Electricity tariff set for 30-MW Ulubelu Bottoming Unit geothermal power plant, Indonesia
Signing of electricity tariff agreement for 30-MW Ulubelu Bottoming Unit in Lampung, Indonesia (source: Pertamina Geothermal Energy)
Carlo Cariaga
24 Feb 2026
The electricity tariff has been set for the 30-MW Ulubelu Bottoming Unit geothermal power plant in Indonesia which is set to be operational by 2027.
PT Pertamina (Persero), through PT Pertamina Geothermal Energy (PGEO), and PT PLN Indonesia Power (PLN IP) have officially reached an electricity tariff agreement for the 30-MW Ulubelu Bottom Unit geothermal power plant in Lampung, Indonesia. This is significant progress for the project which has a target of start of commercial operations by 2027.
The Ulubelu Bottoming Unit will be the first binary power plant unit jointly developed by PLN IP and PGEO at the existing Ulubelu geothermal site. By using residual heat from the current geothermal power generation operations, it will increase power output without the need to to drill additional wells. Ulubelu had already been cited as one of the operational geothermal fields of PGEO with potential for capacity expansion through co-generation.
With the tariff now set, the project partners will move forward with the formation of a joint venture, the procurement of an EPCC, and the signing of a PPA.
In 2025, PT Pertamina (Persero) and PT PLN (Persero) signed a Memorandum of Understanding (MoU) regarding the development of geothermal energy in 19 existing projects with a total capacity of 530 MW, which was facilitated by sovereign wealth fund PT Danantara Asset Management. The 30-MW Ulubelu Bottoming Unit, along with the 15-MW Lahendong Bottoming Unit, was included as part of the Heads of Agreement and a “quick win” strategy for PGEO to reach 1 GW of installed capacity by 2030.
“The national energy transition needs to be consistently promoted by optimizing the use of clean and reliable energy available domestically. PGE’s synergy with PLN Indonesia Power in the development of the Ulubelu Bottoming Unit is expected to become a model that can be replicated in bottoming projects in other existing PGE working areas, such as Lahendong in North Sulawesi and Lumut Balai in South Sumatra. This represents PGE’s real contribution to strengthening the energy transition ecosystem and national energy security,” said Edwil Suzandi, Director of Exploration & Development at PGEO.
Source: Pertamina Geothermal Energy
