PT Pertamina Geothermal Energy Tbk, together with its subsidiaries, engages in the development of the geothermal sector from the upstream and/or downstream sides in Indonesia. It operates through two segments: Own Operations and Joint Operating Contracts. The Own Operations segment manages geothermal fields, including Sibayak, Kamojang, Lahendong, Ulubelu, Karaha, and Lumut Balai, covering activities such as exploration, development, and production of geothermal steam and electricity. The company also generated electricity. As of December 31, 2025, the company managed 16 working areas (WK), which include 13 geothermal working areas (WKP), and two geothermal permit (IPB) working areas. The company was founded in 2006 and is headquartered in Jakarta Pusat, Indonesia. PT Pertamina Geothermal Energy Tbk is a subsidiary of PT Pertamina Power Indonesia.