Villaroche Deep Geothermal Power Plant Powers Safran’s Low-Carbon Industrial Future

Commissioning of the Villaroche Deep Geothermal Power Plant: A Blueprint for Industrial Decarbonisation

On 4 November 2026, Safran inaugurated its deep geothermal power plant at Villaroche, in Seine-et-Marne, marking a milestone in the decarbonisation of French industry. The facility is designed to supply the majority of heat needed by one of Safran Aircraft Engines’ largest production sites, replacing a substantial share of natural-gas consumption with locally sourced, renewable underground heat.

The project is more than a new energy installation. It demonstrates how a major industrial manufacturer can use deep geothermal energy, heat pumps and modernised heat networks to cut emissions while maintaining the reliable, high-temperature energy supply required by advanced manufacturing. With an investment of €34 million, the plant is expected to cover 84% of Villaroche’s heating needs and avoid approximately 6,500 tonnes of CO2 emissions each year.

A First for Île-de-France

Villaroche is now home to the first industrial deep geothermal power plant in Île-de-France. That distinction matters because the Paris region is densely populated, heavily industrialised and constrained by limited space for large-scale renewable infrastructure. Unlike wind or solar installations, geothermal systems can deliver heat directly beneath industrial sites, making them particularly suitable for factories, campuses and district-heating networks.

The Villaroche plant draws naturally heated water from the Dogger aquifer, a deep limestone formation beneath the Paris Basin. At a depth of 1,650 metres, the water reaches approximately 75°C. Rather than burning fossil fuels to generate heat above ground, Safran is using heat that has already been stored by the Earth.

This approach turns an invisible underground resource into a practical industrial asset. The heat is recovered at the surface, upgraded where necessary through heat pumps, and distributed through the site’s heating network. The water itself is not consumed: after transferring its heat, it is returned to the same aquifer through an injection well.

Why Villaroche Matters

Safran Aircraft Engines’ Villaroche site is one of the company’s most important industrial locations. It employs around 6,500 people and plays a central role in the design, production and support of aircraft engines. Such facilities require substantial and stable supplies of heat for buildings, workshops, testing activities and industrial processes.

Historically, much of that heat has been supplied by gas boilers. While gas remains a flexible and familiar industrial fuel, it exposes operators to carbon emissions, price volatility and dependence on imported energy. The Villaroche project addresses all three challenges at once.

By replacing 84% of the site’s current gas-based heating needs, Safran expects to reduce the carbon emissions associated with heating by 75%. The remaining energy requirement will still need to be met, but the shift substantially reduces the site’s exposure to fossil-fuel consumption and strengthens its long-term energy resilience.

The project also carries symbolic weight. Villaroche is Safran’s largest site worldwide, and the decision to make it a flagship for low-carbon heat signals that industrial decarbonisation is not limited to electricity generation or vehicle electrification. It can also transform the thermal energy that keeps factories operating.

How the Plant Works

The Villaroche system is based on a geothermal doublet: two wells drilled roughly one kilometre apart into the Dogger aquifer. One well extracts hot water from underground; the other returns the cooled water after its heat has been recovered.

A submerged pump brings water at about 75°C to the surface. It passes through a heat exchanger, where its thermal energy is transferred to a separate closed loop of heating water. That heated water circulates through the buildings and industrial facilities at Villaroche.

Because the geothermal water and the site’s heating water never mix, the system can operate safely and cleanly. The geothermal fluid remains isolated within its own circuit, while the heating network receives only the recovered heat.

Heat pumps then boost the temperature or output of the system where needed. This is an important detail: deep geothermal water at 75°C is useful, but industrial heating systems often require higher temperatures or more consistent delivery. Heat pumps allow the plant to maximise the value of the available heat rather than relying solely on the temperature of the aquifer.

After the heat has been extracted, the cooled geothermal water is injected back into the Dogger aquifer. This closed-loop approach is central to the environmental case for the project. It preserves the underground resource, limits surface discharge and allows the aquifer to continue supplying heat over the long term.

A €34 Million Investment

The Villaroche project required an investment of €34 million. Safran carried out the work with Dalkia, which acted as project manager, and Arverne Group, which handled the drilling operations. The French State supported the initiative through the Agency for Ecological Transition, ADEME, contributing 20% of the total investment.

That public support reflects a broader policy reality: deep geothermal projects often involve high upfront costs, geological uncertainty and long construction timelines. Drilling to 1,650 metres, installing production and injection infrastructure, integrating heat pumps and adapting existing heating networks are capital-intensive activities.

Yet once operational, geothermal systems can provide predictable, low-carbon heat for decades. Unlike solar or wind generation, geothermal heat is not dependent on weather or daylight. That makes it particularly valuable for industrial sites that need continuous heating throughout the year.

The Villaroche investment therefore needs to be viewed not only as an environmental expenditure but also as an energy-infrastructure decision. It reduces future reliance on gas, creates a local renewable heat supply and gives Safran greater control over a critical input to its operations.

The Role of Dalkia and Arverne

The project brings together complementary expertise. Dalkia, a subsidiary of EDF, is responsible for the design, construction and operation of the energy system. Its role includes integrating the geothermal source with heat pumps, heat exchangers and the modernised heating network.

Arverne Group, through Arverne Drilling Services, brought specialist knowledge of underground resources and drilling. The company’s involvement was essential to reaching the Dogger aquifer at the required depth and establishing the production-injection doublet that makes the system work.

This partnership illustrates a broader trend in industrial decarbonisation: manufacturers do not need to become geothermal specialists themselves. Instead, they can partner with energy-service companies and subsurface experts to develop, finance, build and operate complex renewable-heat systems.

For Dalkia, Villaroche demonstrates the commercial potential of geothermal heat in industrial settings. For Arverne, it provides a high-profile reference project in one of France’s most economically important regions. For Safran, it provides a practical route to reduce emissions without compromising production.

Heat Pumps Change the Equation

One of the most important technical features of Villaroche is the combination of deep geothermal energy with heat pumps. Geothermal water at 75°C is valuable, but heat pumps can upgrade that heat to meet the specific requirements of industrial buildings and processes.

Heat pumps work by moving heat from a lower-temperature source to a higher-temperature delivery system, using electricity to drive the process. When the input heat is already warm, as it is at Villaroche, the amount of electricity required is reduced compared with extracting heat from ambient air or cold water.

This makes the system more efficient and more versatile. It also means that the geothermal resource does not need to be hot enough on its own to satisfy every heating requirement. Instead, it can serve as a stable base-load heat source, with heat pumps providing flexibility and temperature uplift.

The approach is especially relevant for manufacturers seeking to phase out gas boilers. Many industrial sites cannot simply replace gas with low-temperature heat because their buildings, equipment or processes require higher temperatures. By combining geothermal heat with heat-pump technology, Villaroche offers a more realistic transition model.

A Major Step in Safran’s Climate Plan

The Villaroche plant is a central component of Safran Aircraft Engines’ low-carbon plan. It also contributes to Safran’s group-wide target of reducing CO2 emissions from its operations by 50% by 2030, compared with 2018.

That target covers emissions generated by Safran’s own activities, often described as Scope 1 and Scope 2 emissions. Industrial heat is a major contributor in this category, particularly at manufacturing sites with large buildings, test facilities and energy-intensive operations.

By replacing most of the gas used for heating at Villaroche, Safran is addressing a substantial and measurable source of emissions. The expected annual avoidance of 6,500 tonnes of CO2 is significant in its own right, but the strategic value may be even greater. The project creates a repeatable model that could be applied at other industrial sites in France and beyond.

Safran has also invested in photovoltaic installations at around 15 sites in France and internationally. Geothermal heat and solar electricity address different parts of the energy system: solar can supply power, while geothermal can supply heat. Together, they form a more complete decarbonisation strategy for industrial operations.

Local Energy, Industrial Security

The Villaroche project also has an energy-security dimension. The heat it produces is generated locally, from a resource beneath the site itself. That reduces dependence on imported fossil fuels and exposure to international gas-market disruptions.

For a company such as Safran, whose products are critical to civil aviation and defence, energy resilience is not a secondary concern. Stable access to affordable energy supports production continuity, cost control and industrial competitiveness.

Deep geothermal energy cannot replace every fossil-fuel use in industry. High-temperature processes, such as certain metallurgical operations, may still require other solutions. But for space heating, low- and medium-temperature industrial heat, and building services, geothermal energy can play a major role.

Villaroche shows that this role can be delivered at scale. It is not a demonstration project confined to a laboratory or a small public building. It is a full-scale industrial energy system serving one of France’s most important aerospace manufacturing sites.

The Wider Potential in the Paris Basin

The Dogger aquifer is one of the most promising geothermal resources in the Paris Basin. It lies at accessible depths beneath much of the region and contains naturally heated water suitable for district heating, industrial applications and other low-carbon heat uses.

The Paris region has historically used geothermal energy in some district-heating systems, but Villaroche represents a new step: its use as a major industrial heat source for a large aerospace manufacturer. That could encourage other industrial operators, hospitals, universities, logistics centres and local authorities to examine the potential beneath their own sites.

The potential is particularly compelling because heat demand is often concentrated in the same places where underground resources are available. Industrial parks, urban districts and public facilities all require reliable heat. If the subsurface can provide that heat without emissions, the economics of decarbonisation become more attractive.

There are, of course, constraints. Not every location has suitable geology, and drilling projects require careful assessment of aquifer conditions, water chemistry, seismic risk, land availability and regulatory requirements. But Villaroche demonstrates that these challenges can be managed when the right partners, financing and technical expertise are brought together.

Environmental Performance Without Compromise

A common concern with geothermal projects is their environmental impact. Drilling inevitably disturbs land, and poorly managed systems can affect groundwater or produce unwanted emissions. Villaroche’s design addresses these concerns through a closed-loop approach.

The production well extracts hot water, but the injection well returns it to the same aquifer after heat recovery. The geothermal fluid and the site’s heating water remain physically separated. This prevents contamination and ensures that the resource is managed sustainably.

The plant also avoids combustion at the point of heat generation. Unlike a gas boiler, it does not release CO2 directly to produce heat. While electricity used by pumps and heat pumps has its own carbon footprint, the overall system is designed to deliver a major net reduction in emissions.

The expected saving of 6,500 tonnes of CO2 per year is equivalent to removing a meaningful volume of emissions from the site’s annual footprint. It also shows that industrial decarbonisation can deliver large, measurable results rather than relying solely on incremental efficiency improvements.

A Model for European Industry

Villaroche arrives at a time when European manufacturers face competing pressures: reduce emissions, control energy costs, maintain competitiveness and secure supply chains. Deep geothermal energy offers a rare combination of benefits that speaks directly to those pressures.

It provides low-carbon heat, local energy production, long-term price stability and reduced exposure to fossil-fuel markets. It also uses infrastructure that can operate continuously, making it well suited to industrial demand.

The challenge is scaling. Deep geothermal projects require technical expertise, substantial capital and patient planning. They also need supportive public policy, particularly in the early stages when geological risk and upfront costs can deter investment.

The French State’s contribution through ADEME is therefore significant. By covering 20% of the investment, public funding helped make the project viable and signalled that industrial geothermal energy is a strategic priority. Similar support mechanisms could accelerate adoption across Europe, especially in regions with favourable geology.

Lessons for Other Manufacturers

Villaroche offers several lessons for companies considering their own energy transitions.

First, decarbonisation does not have to wait for a single perfect technology. Safran combined deep geothermal heat, heat pumps and network modernisation to create a practical solution tailored to its site.

Second, industrial sites should assess their underground heat potential early. Many factories sit above aquifers or geological formations that could supply low-carbon heat, yet this resource is often overlooked in energy planning.

Third, partnerships matter. Safran did not attempt to develop the project alone. It worked with Dalkia and Arverne, combining industrial operational knowledge with energy-services and drilling expertise.

Fourth, public support can play a decisive role in overcoming the high initial cost of infrastructure. The Villaroche project shows how targeted funding can help turn a technically viable concept into an operational industrial asset.

Finally, companies should treat energy transition as part of industrial strategy, not merely as a compliance exercise. At Villaroche, the geothermal plant reduces emissions while improving energy resilience and supporting long-term competitiveness.

A Symbol of Responsible Industry

Safran’s leadership has framed Villaroche as more than an energy project. Stéphane Cueille, Chief Executive Officer of Safran Aircraft Engines, described it as a symbol of the company’s ambition to produce, design and consume responsibly.

That framing is important. Industrial companies are often criticised for their environmental footprint, particularly in sectors such as aerospace where emissions are difficult to eliminate. Projects such as Villaroche do not solve every environmental challenge associated with aviation, but they show that manufacturers can take concrete action within their own operations.

The project also challenges the idea that ecological transition and industrial competitiveness are incompatible. By using a local renewable resource to replace fossil-fuel heat, Safran is pursuing environmental performance and operational resilience at the same time.

Mathieu Lefèvre, Minister Delegate for Ecological Transition, made a similar point at the inauguration. He argued that ecological transition and the economy can move forward together, with decarbonisation projects combining environmental performance, corporate responsibility and competitiveness.

What Comes Next

The commissioning of the Villaroche plant marks the beginning of a new operational phase. The system must now demonstrate its performance in real industrial conditions: delivering consistent heat, maintaining aquifer balance, optimising heat-pump operation and integrating smoothly with Safran’s production activities.

If it performs as expected, Villaroche could become a reference project for industrial geothermal energy in France. Its success could encourage other manufacturers to investigate deep geothermal options, particularly those located above the Paris Basin’s productive aquifers.

It could also influence how public authorities design support programmes for industrial heat decarbonisation. The combination of private investment, specialist partners and public funding has produced a facility with clear emissions benefits and a credible industrial use case.

The broader message is straightforward: the energy transition is not only about electricity. Heat remains one of the largest and least visible sources of industrial emissions, and solutions such as deep geothermal energy can address it directly.

Conclusion

The Villaroche deep geothermal power plant is a practical demonstration that industrial decarbonisation can be ambitious, local and technically grounded. By tapping water at 75°C from 1,650 metres below the surface, Safran is replacing most of the gas previously used to heat one of its largest production sites.

The project combines deep geothermal energy, heat pumps, heat exchangers and a modernised heating network into a system designed to cover 84% of Villaroche’s heating needs. It is expected to avoid 6,500 tonnes of CO2 emissions annually and reduce heating-related emissions by 75%.

More importantly, it provides a template. It shows that major industrial sites can reduce fossil-fuel dependence without sacrificing reliability, and that underground heat can become a strategic industrial resource rather than an abstract climate solution.

As Europe seeks to decarbonise its industrial base, Villaroche offers a compelling example of what is possible when engineering ambition, public support and industrial leadership align. The heat beneath Safran’s factory is now helping power a more sustainable future for French manufacturing.

Source: Safran Group