Geothermal boost for Amsterdam: OMV and Cocreators selected to lead regional heat projects The Aardwarmte Regio Amsterdam consortium — made up of Vattenfall, the Municipality of Amsterdam and Energie Beheer Nederland (EBN) — has selected OMV, in collaboration with Cocreators, as the operator to advance geothermal projects for collective heat networks across the Amsterdam region. The decision, reached after a European tender process, brings an experienced international energy company and a project-management specialist together with local partners to test feasibility, design potential geothermy doublets and, where viable, develop and implement geothermal heat production for district heating systems. Why this matters Decarbonising heating is one of the most urgent and technically complex elements of the energy transition in dense European cities. In the Netherlands, where gas has historically supplied much of the built environment, scaling low-carbon alternatives for space heating and ho...
Geothermal EPC Companies: How Developers Choose a Contractor
Image: A Thematic image of a geothermal power plant
Geothermal developers choose EPC contractors by combining technical geothermal experience, financial strength, execution credibility, and the ability to manage field-specific risk. In recent awards, the strongest bidders have been those with proven geothermal references, repeat-delivery history, and the ability to package engineering, procurement, construction, and commissioning into one bankable offer .
Why geothermal EPC is different
Geothermal EPC is more complex than standard power plant construction because the contractor must build around a live underground resource. That means the project team has to deal with reservoir uncertainty, steam chemistry, scaling, corrosion, reinjection behavior, plant-field interfaces, and grid interconnection all at once .
For developers, this turns EPC selection into a risk-management decision. The contractor is not just a builder; it is the party responsible for turning a geologically uncertain asset into a functioning power plant that can meet schedule, performance, and warranty targets .
What developers screen first
The first gate is usually prequalification, where developers check whether bidders have genuine geothermal experience, enough financial capacity to support guarantees, and a delivery record that matches the project’s size and complexity. Supreme Energy’s Rantau Dedap tender is a clear example: bidders had to demonstrate geothermal EPC experience, technical ability, financial strength, safety systems, and reputation, and they also had to post a bid bond .
That screening logic is common across geothermal markets. A developer wants to avoid awarding a project to a contractor that can build industrial facilities in general but lacks the specific experience needed for geothermal commissioning, plant integration, or chemistry-driven operating issues .
Mercury NZ’s Ngatamariki expansion is one of the clearest recent examples of contractor choice based on proven performance. In September 2023, Mercury signed EPC contracts with Ormat for a new 56 MW gross geothermal plant at Ngatamariki, and the project was designed as an expansion of the existing 96 MW plant that Ormat had already built in 2012 .
The logic is straightforward: Mercury selected a contractor that already knew the site, the operating environment, and the plant platform. In geothermal, that kind of familiarity matters because it reduces interface risk and helps the developer trust the contractor’s engineering and commissioning assumptions . It also shows why repeat awards are so common in geothermal , once a contractor proves it can deliver, the developer is often willing to extend the relationship rather than reset the project with a new bidder .
Case study: Tehuka 3, New Zealand
A second New Zealand example reinforces the same point. Ormat also signed a contract with Contact Energy for a 59 MW geothermal project at Tehuka 3, and the company described it as its third order from Contact Energy in New Zealand. That repeat-business pattern is highly significant because it shows how much weight developers place on execution history.
Tehuka 3 demonstrates that geothermal procurement is often relationship-driven, but not in a casual sense. The developer is essentially saying that the contractor has already earned trust through past delivery, and that trust has value when the next project is technically similar and commercially important. In geothermal, a known quantity is often more attractive than a cheaper but unproven option .
Case study: Patuha 2, Indonesia
Geo Dipa Energi’s Patuha 2 project shows a more competitive tender model. The EPC contract for the Patuha Unit 2 geothermal power plant in West Java was awarded to the consortium of PT Inti Karya Persada Tehnik (IKPT) and PT Wasa Mitra Engineering (WME) after a tender announced in early 2024 .
This case is important because it shows how a developer can use competitive procurement while still filtering for geothermal specialization. The award documents and reports indicate that the project was chosen not just for price, but for local capability, cost efficiency, and alignment with Indonesia’s local content expectations . The contract was also positioned as a 2027 completion project with a gross MCR of 60.3 MW, which underscores the need for a contractor that can manage a multi-year geothermal execution plan.
What Patuha 2 tells us
Patuha 2 illustrates a classic geothermal procurement trade-off: the developer wants a contractor that can deliver at scale, meet local requirements, and still stay within an economically attractive budget. Geo Dipa’s reported contract value of US$115 million suggests that the owner was balancing commercial discipline with the need for a technically credible EPC partner .
Just as important, the project shows that geothermal owners often prefer consortia when local expertise, procurement capacity, and execution support need to be combined. That approach lets the developer tap both engineering depth and regional delivery capability in one package .
Case study: United States
The United States is becoming a more strategic geothermal EPC market because public programs are broadening the project pipeline and shaping contractor qualification. In 2025, the U.S. Department of Defense announced eleven companies as awardable and pre-approved for geothermal projects, which effectively created a filter for firms that may compete for future geothermal work on defense sites .
The U.S. Department of Energy is also pushing the sector forward through geothermal GRID initiatives and field-scale funding, which are driving more technical, drilling-intensive, and innovation-heavy projects. For developers, that means contractor selection is increasingly tied to the ability to work in phased, data-driven, and high-uncertainty environments rather than simply execute a conventional build .
Case study: Cape Station, United States
Fervo Energy’s Cape Station project in Utah is a useful signal of where U.S. geothermal contracting is heading. The project has been structured so that EPC and equipment integration move in parallel with drilling and stimulation, rather than waiting for a fully de-risked resource before execution .
That changes the kind of contractor developers want. They need firms that can coordinate drilling interfaces, site construction, power block engineering, and interconnection planning at the same time . In this kind of project, EPC selection favors companies with strong controls, flexibility, and comfort with new geothermal workflows rather than only traditional flash-plant delivery experience .
Technology fit matters
One of the biggest reasons geothermal EPC selection is so project-specific is that the technology class can vary widely. Flash plants, binary plants, and enhanced geothermal systems all place different demands on the contractor, especially around chemistry, heat exchange, and commissioning .
Ormat’s New Zealand projects are a strong example of technology fit driving procurement. Ngatamariki and Tehuka 3 both show how a developer can prefer a contractor that already has a tested binary platform and direct experience with the same operating model. That reduces technical uncertainty and makes it easier to forecast performance and availability .
What makes a bid stronger
A strong geothermal EPC bid usually combines realistic pricing with a credible execution plan. Developers want to see a schedule that makes sense, long-lead procurement that is already mapped, and a commissioning strategy that matches the project’s resource and technology .
They also care about financial support. Bid bonds, performance guarantees, and warranty backstops are critical because geothermal projects have high technical and schedule risk. A bidder that cannot provide adequate security or project financing support is often eliminated early, even if the technical proposal looks attractive .
How developers compare contractors
The comparison process usually comes down to five questions:
1. Has the contractor built similar geothermal plants before?
2. Can it prove financial strength and bonding capacity?
3. Does it understand plant-field integration and geothermal chemistry?
4. Can it manage procurement of turbines, generators, and long-lead equipment?
5. Can it execute in the project’s regulatory and local-content environment?
That framework is visible in the recent cases. Mercury used a proven contractor in New Zealand , Contact Energy did the same, Geo Dipa used a qualified consortium in Indonesia , and U.S. public programs are increasingly pre-screening contractors before project awards are even made .
Germany, the United Kingdom, Australia, Iceland, France, Italy, and Japan
In Germany, the United Kingdom, Australia, Iceland, France, Italy, and Japan, geothermal contractor selection often rewards technical specialization, local permitting competence, and strong engineering discipline. These markets may place extra emphasis on reliability, environmental performance, and the contractor’s ability to work within strict utility or industrial frameworks .
For a clean article structure, these countries should be used to show that geothermal EPC is not one global template. The procurement logic changes by project type, regulatory context, and technology class, but the same core principle remains: developers want the contractor that can reduce execution risk and deliver stable long-term output .
Why repeat contractors win
The strongest theme across recent geothermal awards is repeat business. Ormat’s repeated selection by Mercury in New Zealand and by Contact Energy at Tehuka 3 shows how much developers value proven delivery . Once a contractor has demonstrated technical competence, commercial reliability, and commissioning success, the developer often sees less risk in re-selecting that firm than in starting over .
This pattern makes sense because geothermal projects are expensive to restart after a misstep. A contractor that already understands the plant design, the operating environment, and the owner’s expectations can save time, reduce interface problems, and improve the chances of commercial operation .
Conclusion
Geothermal EPC contractors are selected through a disciplined process that favors proven geothermal experience, financial resilience, technical fit, and execution certainty. The recent cases from New Zealand, Indonesia, and the United States show that developers consistently prefer contractors that can manage the complexity of underground resource risk, plant integration, and commissioning without forcing the owner to absorb unnecessary uncertainty .
In geothermal, the best EPC company is not simply the one with the lowest bid. It is the one that can most convincingly turn a difficult resource into a reliable power plant and keep it operating as promised .
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