Serbia Advances Geothermal Drilling for the Mišeluk District Heating Plant in Novi Sad Serbia is moving forward with plans to develop a geothermal district heating system in Mišeluk, a rapidly urbanizing area of Novi Sad. The project is intended to place geothermal energy at the centre of a new low-carbon heating network, supported by solar power and natural gas backup. Exploratory drilling and construction of the heat distribution network are being carried out by JKP Novosadska toplana, Novi Sad’s public district heating utility. The initiative is supported through the United Nations Development Programme’s “Geothermal Energy in Serbia” programme, with financial backing from Slovakia. The Mišeluk project is important not only because it could provide a new renewable heat source for Novi Sad, but also because it demonstrates how geothermal energy can be integrated into urban development from the earliest planning stages. Rather than retrofitting a geothermal system into an establi...
€200 Million Financing Accelerates Dutch Geothermal Energy Cluster in Centraal Oostland
A new financing framework of up to €200 million is set to accelerate the development of a major geothermal energy cluster in Centraal Oostland, a greenhouse horticulture region in South Holland, the Netherlands.
The facility, arranged by ING and Rabobank for renewable heat infrastructure platform 85 Degrees Renewable, will support the next phase of geothermal development in the region. The funding is expected to finance new geothermal wells, expand heat distribution infrastructure and strengthen the long-term growth of an integrated renewable heat platform serving greenhouse growers.
The transaction is significant not only because of its size, but also because it demonstrates the growing ability of geothermal heat projects to attract institutional and bank financing. It highlights a shift from treating geothermal energy as a collection of individual drilling projects toward developing integrated heat infrastructure with predictable customers, long-term contracts and scalable expansion potential.
The first financing tranche is reported to total €82 million and will support three geothermal doublets and an associated heat distribution network in the Oostland greenhouse area.
€200 Million Framework Supports Next Development Phase
The senior debt facility from ING and Rabobank provides 85 Degrees Renewable with access to project financing of up to €200 million as its development pipeline progresses.
The financing initially supports the continued expansion of the Centraal Oostland geothermal heat network, including developments in Bleiswijk and Berkel en Rodenrijs. It also refinances existing bridge facilities and creates a financial structure that can accommodate additional geothermal projects and heat infrastructure over time.
Unlike a one-off project loan, the financing framework is designed to support a broader renewable heat platform. This structure gives 85 Degrees Renewable greater flexibility to develop projects in phases, align investment with customer demand and expand the network as additional sites become ready.
For geothermal developers, this type of framework can be particularly valuable. Projects often require substantial upfront investment in exploration, drilling, production facilities, pipelines, heat exchangers, pumping systems and customer connections. A platform-based approach can reduce the need to arrange entirely new financing structures for every individual well or network extension.
The transaction also signals increased confidence among lenders in the commercial maturity of geothermal heat infrastructure. The 85 Degrees Renewable platform describes the financing as evidence that well-developed geothermal assets are increasingly being recognised as an investable infrastructure class capable of attracting long-term project finance.
What the Financing Will Fund
The capital will support several interconnected components of the Centraal Oostland geothermal cluster.
New geothermal wells
Geothermal wells will provide access to hot water stored in deep geological formations beneath the region. Production wells bring hot water to the surface, where its heat can be transferred to a district or greenhouse heat network. Reinjection wells then return the cooled geothermal water to the subsurface reservoir.
The project’s first phase is expected to include three geothermal doublets. Each doublet generally consists of a production well and a reinjection well, although the final configuration depends on reservoir characteristics, well design and operating requirements.
Image: looks like a well struck deal
The successful drilling programme completed to date has reduced subsurface uncertainty across the existing assets and provides a foundation for further development. This is important because geological risk is one of the central challenges affecting geothermal financing. Once drilling data confirms reservoir temperature, permeability, flow rates and water chemistry, developers and lenders can make more informed assessments of future performance.
Heat distribution infrastructure
The financing will also support expansion of the heat network connecting geothermal production facilities with greenhouse operations.
A geothermal system is only commercially useful when it can deliver heat reliably to customers. This requires more than drilling wells. It requires pipelines, pumping stations, heat exchange equipment, monitoring systems, control infrastructure and connection points at customer sites.
The heat network is being developed as part of an integrated system rather than as a separate activity. This enables the project partners to coordinate well capacity, pipeline routes, customer demand and future expansion from the beginning.
Future network expansion
The framework is designed to support additional geothermal projects and network extensions as the development pipeline progresses. This creates the possibility of a larger regional heat platform serving more greenhouse businesses and potentially other customer groups.
The infrastructure is also being designed to accommodate additional sustainable heat sources in the future. These could include other geothermal wells, industrial waste heat, aquifer thermal energy storage, solar thermal energy or other low-carbon sources, depending on technical and commercial conditions.
This flexibility is essential in modern heat planning. A network built around a single source may face operational limitations if production declines, demand changes or new technologies become competitive. A multi-source system can provide greater resilience and allow the energy mix to evolve over time.
Centraal Oostland as a Geothermal Heat Hub
Centraal Oostland is one of the Netherlands’ important greenhouse horticulture regions. The area includes greenhouse operations around Bleiswijk and Berkel en Rodenrijs, where controlled-environment agriculture depends heavily on reliable heat supplies.
Greenhouses require heat to maintain crop-growing conditions during cold periods. Historically, much of this heat has been supplied by natural gas-fired combined heat and power systems or conventional boilers. Although these systems can provide dependable energy, they expose growers to fossil-fuel price volatility and contribute to greenhouse gas emissions.
Geothermal energy offers an alternative source of continuous heat. It is particularly suitable for greenhouse horticulture because the sector generally has a stable and substantial heat demand, which improves the utilisation rate of geothermal infrastructure.
The Centraal Oostland cluster is expected to expand access to geothermal heat for more than 30 greenhouse operations. This would allow participating growers to reduce their reliance on natural gas while improving the sustainability and long-term competitiveness of their businesses.
The project therefore links energy infrastructure with agricultural production. It is not simply a renewable power project; it is a renewable heat system designed around the operational needs of a major food-producing sector.
Why Greenhouse Horticulture Is Well Suited to Geothermal Energy
Geothermal energy has several characteristics that align with greenhouse heating requirements.
Reliable base-load heat
Unlike solar and wind power, geothermal heat can generally be produced continuously, subject to reservoir and plant operating conditions. This makes it suitable for base-load applications where customers require a consistent supply of thermal energy.
Greenhouse growers need heat when crops require it, not only when renewable electricity production is high. Geothermal energy can therefore complement variable renewable sources and reduce the need for fossil-fuel backup.
Using geothermal energy directly for heating is typically more efficient than converting heat into electricity and then using electricity to produce heat.
In a greenhouse application, geothermal fluid transfers heat through a heat exchanger into a closed-loop network. The geothermal water itself does not necessarily circulate through customer heating systems. Instead, thermal energy is transferred while the geothermal fluid is managed and reinjected in accordance with project and regulatory requirements.
Reduced natural gas exposure
Access to geothermal heat can reduce the amount of natural gas required for greenhouse heating. This may lower exposure to fossil-fuel price fluctuations and improve the predictability of operating costs.
The commercial value of geothermal heat depends on several factors, including drilling costs, available reservoir temperature, network distance, customer contracts, alternative fuel prices and government policy. However, a well-designed project can provide long-term value by replacing part of a customer’s fossil-fuel demand with locally produced renewable heat.
Support for sector competitiveness
The Dutch greenhouse sector competes in international food and horticultural markets. Energy costs can materially affect the profitability of growers, particularly when natural gas prices rise sharply.
A dependable renewable heat source can help improve the resilience of greenhouse businesses. It may also support the sector’s ability to meet retailer, consumer and regulatory expectations regarding emissions and sustainable production.
An Integrated Heat System Rather Than an Isolated Project
One of the most important features of the Centraal Oostland development is its integrated design.
The project partners are developing geothermal wells, heat networks, heat supply arrangements and future expansions as part of one coordinated system. This approach recognises that geothermal energy does not operate in isolation. The value of a well depends on the availability of heat customers, while the value of a heat network depends on a secure and affordable supply source.
An integrated system can improve planning in several ways:
- Well capacity can be matched more closely with contracted heat demand.
- Network routes can be planned around current and future customer connections.
- Heat supply infrastructure can be sized for phased expansion.
- Additional renewable heat sources can be incorporated in later stages.
- Operations and maintenance responsibilities can be coordinated across the system.
- Financing can be linked to a growing portfolio rather than a single asset.
This is also relevant to geothermal project risk. Drilling is often the most visible technical challenge, but a commercially successful project must also manage heat offtake, permitting, construction, reservoir performance, insurance, financing and long-term operations.
By planning the full system from the outset, the Centraal Oostland partners aim to create a scalable model for future geothermal projects in the Netherlands.
The Role of Gaia Energy, 85 Degrees Renewable and Foresight
The project brings together three complementary capabilities.
85 Degrees Renewable is developing a renewable heat infrastructure platform focused on geothermal assets and associated heat networks. Its business model involves developing, financing, owning and operating sustainable heat infrastructure for Dutch greenhouse horticulture, with potential expansion into residential and industrial heat markets.
Gaia Energy contributes geothermal development, construction and operational expertise. The company has been active in the Dutch geothermal sector for more than a decade and is involved in the development and operation of geothermal projects and associated infrastructure.
Foresight Group provides investment capacity through its sustainability-focused real assets and private equity platform. Its participation enables the project to combine long-term infrastructure capital with specialist geothermal capabilities.
This division of responsibilities reflects the increasingly sophisticated structure of renewable heat projects. Successful development requires technical expertise, capital, construction management, commercial contracting and long-term asset operations.
The partnership between 85 Degrees Renewable, Gaia Energy and Foresight is intended to create a repeatable platform rather than deliver only one project. That distinction matters because the Netherlands needs multiple geothermal developments if the technology is to make a significant contribution to national heat decarbonisation.
Financing Shows Geothermal Heat Is Becoming Investable
The involvement of ING and Rabobank is an important commercial signal.
Geothermal projects face risks that differ from those of solar and wind assets. These include exploration uncertainty, drilling risk, reservoir performance, scaling and corrosion, induced seismicity considerations, regulatory requirements and the need to secure long-term heat customers.
Banks must therefore assess both the subsurface resource and the above-ground infrastructure. They also need confidence that customers will purchase sufficient heat over a long period to support debt repayment.
The first €82 million tranche, arranged through the two banks, will finance three geothermal doublets and the associated heat distribution network. The wider framework can expand to as much as €200 million as more projects are developed.
This financing structure suggests that the project has achieved several conditions important for debt investment:
- A sufficiently developed geothermal resource base.
- A clear portfolio of projects and expansion opportunities.
- Identifiable heat customers in the greenhouse sector.
- An operating model capable of managing geothermal assets.
- Long-term revenue visibility from heat sales.
- Strategic alignment between investors, developers and lenders.
The project is built around long-term contracted heat sales, which can provide more stable and predictable revenues than merchant energy markets. This type of revenue structure is particularly relevant for infrastructure lenders because it can improve debt-service visibility and reduce exposure to short-term market volatility.
Geothermal Heat and Electricity Grid Congestion
The project could also contribute to addressing electricity grid constraints in the Netherlands.
Heating is increasingly being electrified through heat pumps and other technologies. Electrification can reduce direct fossil-fuel consumption, but it also increases demand for electricity. In areas with limited grid capacity, new electricity-intensive heating loads may be difficult or expensive to connect.
Geothermal energy provides a way to decarbonise heat without converting all heating demand into electricity. By delivering thermal energy directly through a heat network, geothermal projects can reduce the additional electrical load that might otherwise result from widespread electric heating.
This does not mean geothermal eliminates electricity requirements. Pumps, controls and other equipment still consume power, and geothermal systems may be integrated with electric technologies. However, the overall electricity demand associated with direct geothermal heat can be lower than the demand created by electrifying the same heat load.
The 85 Degrees Renewable platform reports that its operating geothermal assets deliver heat with a carbon intensity of 24 grams of carbon dioxide per kilowatt-hour, based on an independent assessment by Impact Institute in accordance with ISO 14067. The platform also reports that methane naturally produced with geothermal water is used to generate electricity for on-site operations, while the resulting carbon dioxide is supplied to greenhouse growers for crop production. [3]
A Potential Model for Dutch Heat Transition
The Centraal Oostland project may provide lessons for other Dutch regions considering geothermal development.
First, customer concentration can be an advantage. Greenhouse clusters offer a substantial heat demand located within a relatively defined geographic area. This can reduce the distance between geothermal production sites and customers, improving network economics.
Second, phased expansion can reduce development risk. A platform can begin with an initial set of wells and customers before adding new production capacity and network connections.
Third, long-term partnerships are essential. Geothermal projects require cooperation among developers, investors, lenders, regulators, local authorities, landowners and heat customers.
Fourth, integrated planning can improve system performance. The wells, heat network and customer connections need to be developed in coordination rather than sequentially.
Finally, project finance can help convert geothermal potential into operating infrastructure. Public support and grants may remain important for exploration or early-stage risk, but commercial debt and private investment are necessary for wider deployment.
Challenges That Still Require Attention
Despite the positive financing milestone, geothermal development remains technically and commercially complex.
Subsurface performance
A geothermal project must achieve sufficient flow rates and temperature to meet its heat supply commitments. Actual reservoir performance can differ from initial estimates, making monitoring and adaptive management important.
Drilling costs
Deep geothermal wells require specialised equipment, experienced contractors and careful geological planning. Cost overruns or delays can affect project economics and financing schedules.
Heat network economics
Pipelines and customer connections can represent a significant share of total capital expenditure. Network design must balance current demand with future expansion while avoiding excessive oversizing.
Customer participation
The financial strength of a geothermal project depends partly on customer contracts and sustained heat demand. Growers must be willing to connect, purchase heat and adapt their operations to the system’s supply conditions.
Regulation and public confidence
Geothermal projects require permits, environmental assessments, water-management approvals and monitoring arrangements. Transparent communication is especially important where communities have concerns about subsurface operations or induced seismicity.
Operational integration
The project must manage geothermal heat production, backup systems, customer demand, maintenance and potential additional heat sources as one system. This requires strong control systems and experienced operators.
These issues do not undermine the significance of the financing. Instead, they show why an integrated project platform and experienced development partners are important.
Beyond Greenhouses: Expansion Into the Built Environment
Although greenhouse horticulture is the initial focus, Gaia Energy is also applying its experience to geothermal projects serving buildings and institutions.
The Geothermie Delft project is an example of how geothermal energy can support sustainability in homes, educational facilities and other buildings. Such projects can be more complex than greenhouse applications because building heat demand varies seasonally and may require integration with district heating systems, heat pumps and thermal storage.
The experience gained in Centraal Oostland could support future geothermal applications in urban and mixed-use environments. Technical knowledge from well design, heat exchange, network operation and customer integration can be adapted to other sectors.
This creates a potential pathway for geothermal energy to become part of a broader Dutch sustainable heat portfolio. Greenhouse horticulture may provide a strong early market, while residential, commercial and institutional users could create additional demand as networks expand.
What the Deal Means for the Dutch Geothermal Sector
The €200 million framework reinforces the idea that geothermal energy is moving toward a more mature phase in the Netherlands.
The sector still requires careful regulation, high-quality data and responsible project execution. However, the ability to attract bank financing for a multi-project heat platform shows that geothermal heat is increasingly being assessed as infrastructure rather than only as an experimental energy technology.
The project also illustrates the importance of moving beyond technology demonstrations. The central question is no longer simply whether geothermal heat can be produced. It is whether geothermal systems can be financed, built, operated and expanded while delivering reliable value to customers.
In Centraal Oostland, the answer will depend on execution across the entire value chain. If the wells perform as expected, the network expands successfully and customers receive dependable heat, the project could become a reference point for geothermal development in other Dutch greenhouse clusters.
Conclusion
The €200 million financing framework arranged by ING and Rabobank gives 85 Degrees Renewable the financial capacity to advance the Centraal Oostland geothermal cluster and expand its sustainable heat platform. The initial €82 million tranche supports three geothermal doublets and an associated heat network serving greenhouse horticulture businesses in the Oostland region.
The project’s importance extends beyond the number of wells or the size of the financing. Its integrated approach connects geothermal production, heat infrastructure, customer supply and future expansion within a single development model.
For greenhouse growers, the cluster offers a route to reduce natural gas dependence, improve supply security and strengthen long-term competitiveness. For the Dutch energy transition, it demonstrates how direct renewable heat can reduce emissions while limiting additional pressure on the electricity grid.
The project also provides a commercial example of how specialist geothermal expertise, infrastructure investment and bank financing can be combined to deliver scalable renewable heat. If successfully implemented, Centraal Oostland could help establish a repeatable model for geothermal energy development across the Netherlands and beyond.
Source : Floral Daily
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