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PT Geo Dipa Energi Launches Strategic Minor Overhaul Tender for Dieng Unit 1 to Strengthen Geothermal Reliability
PT Geo Dipa Energi Opens Tender for Minor Overhaul of Dieng Unit 1 in 2026
Image: Indonesian Geothermal power plant
PT Geo Dipa Energi (Persero) has opened a tender for the minor overhaul of the Dieng Geothermal Power Plant Unit 1 in 2026, signaling a continued focus on preserving the reliability of one of Indonesia’s most important geothermal assets. The procurement is aimed at selecting a qualified contractor with proven experience in turbine and generator maintenance for thermal power plants, underscoring the technical complexity and operational importance of the work.
The tender, identified as RKS-004-PST/GDE/I/2026, uses a post-qualification bidding method and applies strict administrative, technical, and safety requirements. The schedule places document registration and collection between 26 and 28 January 2026, followed by a mandatory RKS explanation session and field visit on 29 January 2026.
Procurement Scope and Process
The procurement procedure requires prospective bidders to contact procurement@geodipa.co.id to receive instructions for transferring the Rp1,000,000 document fee. After payment, participants must submit a scanned identity card, a stamped power of attorney if represented, and proof of transfer by email to the same address.
The RKS explanation and site visit will be conducted in hybrid form, combining online participation through Microsoft Teams with an on-site session at the Dieng Unit. Attendance is mandatory, and companies that fail to join the session will be automatically disqualified from the next stage. For the site visit, a maximum of three participants, including the driver, may attend, and all are required to wear complete personal protective equipment, including a helmet, safety shoes, and coveralls.
Technical Qualification Requirements
Geo Dipa has set demanding qualification criteria for bidders, reflecting the specialized nature of the overhaul work. Within the last five years, participants must have completed at least three turbine and generator maintenance projects at thermal power plants with a minimum capacity of 50 MW, each valued at no less than Rp8 billion excluding VAT.
In addition, bidders must demonstrate experience in at least two rotor repair projects for 50 MW thermal power plants, with each project worth at least Rp1 billion. Eligible participants must be a limited liability company or a joint operation, hold a valid Geo Dipa E-Procurement certificate, and not be in bankruptcy, under criminal sanction, or subject to court supervision.
Importance of Dieng Unit 1
Dieng Unit 1 entered commercial operation in 2002 with an installed capacity of 55 MW, making it one of the older geothermal assets in Indonesia. After more than two decades of operation, major equipment such as the steam turbine requires periodic maintenance to maintain efficiency, reduce wear, and prevent unplanned shutdowns.
Located in the Dieng geothermal area of Central Java, the plant plays an important role in supplying base-load electricity to the Java-Madura-Bali system. In geothermal power plants, the turbine is a critical component, and even moderate performance decline can affect output, reliability, and operating costs. A carefully planned minor overhaul is therefore essential to sustaining plant performance.
Why Minor Overhaul Is Important
A minor overhaul differs from a major overhaul in scope and duration. Major overhaul typically involves full dismantling and extensive replacement of large components, while minor overhaul focuses on inspection, cleaning, alignment, balancing, limited repair work, and replacement of worn parts.
For a geothermal plant like Dieng Unit 1, this kind of maintenance helps preserve availability, reduce emergency repair costs, and extend asset life. It also supports stable generation, which is crucial for a plant that contributes to continuous base-load supply rather than intermittent output.
Broader Development at Dieng
The tender is taking place alongside a broader expansion strategy in the Dieng field. Geo Dipa has also been advancing the development of Dieng Unit 2, which is planned to add another 55 MW of capacity and strengthen the area’s position as one of Indonesia’s main geothermal hubs.
The expansion program includes new drilling activity and plant construction, with engineering, procurement, and construction handled by a joint operation between PT Timas Suplindo and PT Rekayasa Engineering. This broader development roadmap shows that Geo Dipa is balancing the maintenance of existing assets with the construction of new capacity.
Industry Significance
Indonesia remains one of the largest geothermal resource holders in the world, yet its installed capacity is still well below its total resource potential. In this environment, Geo Dipa’s role as a state-owned geothermal developer is strategically important because it helps turn natural resource potential into dependable power generation.
Maintenance activity such as the Dieng Unit 1 minor overhaul should be seen as part of that broader mission. For geothermal assets, reliable operation is not determined only by drilling and construction, but also by disciplined maintenance of turbines, generators, and auxiliary systems over the full life of the plant.
Operational and Governance Aspects
The tender process also reflects a strong focus on governance and safety. Mandatory participation in the explanation session, compulsory field attendance, and strict personal protective equipment requirements show that the procurement is being handled as a controlled technical process rather than a routine commercial purchase.
This approach is particularly relevant in geothermal operations, where mechanical complexity, high-temperature systems, and environmental hazards require careful planning. A successful contractor will need to deliver the overhaul while maintaining safety, quality, and schedule discipline throughout the project.
Outlook
If completed effectively, the minor overhaul should improve the short- to medium-term reliability of Dieng Unit 1 and support stable electricity production. It may also serve as a reference point for future maintenance programs as Geo Dipa continues to expand its geothermal portfolio in the Dieng region.
For contractors, the tender offers access to a technically demanding project with significant qualification thresholds. For Geo Dipa, it is a practical step toward protecting existing generation assets while advancing long-term geothermal growth in one of Indonesia’s most strategic energy regions.
Source: Petromindo
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