Geothermal Isn't Expensive: The Reservoir Always Has the Final Say Somewhere beneath a volcanic ridge, a drill bit is turning through rock that has not moved in two million years. It costs money every second it turns. And nobody on the surface — not the engineer, not the financier, not the minister who announced the megawatts — knows yet whether that well will produce steam or silence. That single moment explains almost everything people get wrong about geothermal energy. Geothermal is routinely described as expensive, slow, capital-hungry and haunted by drilling risk. Investors are reminded that tens of millions can disappear underground before a single megawatt reaches a grid. All of that is true. But it is not the whole truth. The uncomfortable question the industry keeps avoiding is this: is geothermal expensive, or is the way we develop geothermal making it expensive? Those are two completely different problems. One is geology. The other is us. Why Geothermal Refuses to Be...
By: Robert Buluma
The United Kingdom is quietly entering a new energy chapter—one where heat from deep beneath the Earth is no longer just a scientific curiosity, but a practical source of electricity and critical minerals. The latest development from marks one of the most significant milestones yet in this transition.
The company has secured £10 million in financing from to accelerate the expansion of its geothermal power and lithium production operations in Cornwall. This is not just another funding announcement. It represents a strategic alignment between finance, energy security, and the global race for critical minerals.
At the center of this transformation is a simple but powerful idea: geothermal energy can do more than generate electricity—it can also unlock lithium from naturally heated underground brines, turning clean heat into both power and battery materials.
Cornwall becomes a testbed for Europe’s energy future
Cornwall, historically known for its mining heritage, is now being repositioned as one of Europe’s most important geothermal frontiers. The region is already home to the United Downs geothermal project, operated by Geothermal Engineering Limited, which has become the UK’s first integrated geothermal power and commercial-scale lithium production facility.
This site is not experimental in the traditional sense—it is already producing electricity and extracting lithium from geothermal fluids. The significance lies in its dual output: renewable baseload power and a strategic mineral essential for electric vehicle batteries and grid storage systems.
The geothermal brine at United Downs contains lithium concentrations exceeding 340 parts per million, one of the highest recorded globally. This makes Cornwall not only a renewable energy hub, but also a potential domestic supplier of lithium in a world where supply chains remain heavily concentrated in a few regions.
Why ABN AMRO is backing geothermal lithium
The involvement of reflects a broader shift in European finance. Banks are increasingly positioning themselves not just as lenders, but as enablers of the energy transition.
ABN AMRO has been active in financing geothermal and clean energy projects across Europe, including large-scale lithium initiatives such as Vulcan Energy in Germany. The Cornwall investment fits into a growing portfolio of transition assets that combine decarbonisation with resource security.
For financial institutions, geothermal lithium represents a rare combination:
- Baseload renewable energy (unlike wind or solar intermittency)
- Domestic critical mineral production
- Low land-use footprint
- Strong alignment with EU and UK energy security goals
In simple terms, it is infrastructure that produces both energy and strategic materials without relying on imports from geopolitically sensitive regions.
The technology behind geothermal lithium extraction
At the heart of the project is Direct Lithium Extraction (DLE), a process that separates lithium from geothermal brine after heat and energy have been extracted.
Unlike traditional lithium mining, which relies on evaporation ponds or hard rock mining, DLE works with fluid already circulating through deep geothermal reservoirs. This significantly reduces environmental disruption and water usage.
At United Downs, the geothermal system operates by:
- Drilling deep wells into hot granite formations
- Circulating naturally heated brine to the surface
- Extracting heat to generate electricity
- Separating lithium from the same fluid stream
- Reinjection of the cooled fluid back underground
This closed-loop system ensures sustainability while enabling continuous production.
Geothermal Engineering Limited aims to scale lithium carbonate production from around 100 tonnes per year to nearly 2,000 tonnes per year by the end of the decade. Longer-term projections suggest output could exceed 18,000 tonnes annually across multiple UK sites.
The United Downs milestone: UK’s first geothermal-lithium hybrid plant
The United Downs facility is already operational, marking a first-of-its-kind achievement in the UK energy sector. It currently delivers around 3 MWe of baseload electricity, enough to power approximately 10,000 homes, and sells electricity through .
This integration of geothermal electricity and lithium extraction is what makes the project particularly important. It is not simply a power plant—it is a multi-output energy and materials system.
The plant represents a proof of concept for a wider rollout across Cornwall, where additional licensed sites are already prepared for development.
Scaling geothermal power across Cornwall
Beyond lithium, Geothermal Engineering Limited has a clear ambition to scale geothermal electricity generation across the region. The company has identified multiple sites with existing planning permission, each capable of delivering approximately 5 MWe of baseload power.
Over the next decade, the company aims to reach at least 25 MWe of geothermal electricity production across its portfolio. While this may seem modest compared to large fossil fuel plants, geothermal power has a unique advantage: it runs continuously, 24/7, regardless of weather conditions.
That reliability makes it particularly valuable in modern energy systems that are increasingly dependent on intermittent renewables.
The financial architecture behind the expansion
The £10 million facility from ABN AMRO is structured as a cornerstone financing package. It is designed not only to support immediate expansion but also to unlock further capital investment from institutional and private markets.
The financing will support:
- Expansion of lithium extraction capacity at United Downs
- Development preparation for new geothermal drilling sites
- Infrastructure upgrades for scaling production
- Early-stage site development across Cornwall
This initial capital is expected to act as a catalyst for significantly larger funding rounds as the project matures.
This mix of public, private, and institutional capital reflects the strategic importance of the project at regional, national, and European levels.
Industry leaders on energy security and critical minerals
According to industry stakeholders, this development is more than a technological milestone—it is a geopolitical shift.
Critical minerals like lithium are essential for electric vehicles, battery storage systems, and modern electronics. Yet global supply chains remain highly concentrated, often in regions with political and logistical risks.
By developing domestic lithium production through geothermal systems, the UK is reducing dependence on imports while simultaneously expanding clean energy capacity.
From a strategic perspective, this dual benefit is what makes geothermal lithium particularly attractive:
- Energy security through local baseload generation
- Supply chain resilience for battery materials
- Reduced carbon footprint compared to mining imports
The role of Europe in the geothermal transition
Europe is increasingly positioning geothermal energy as a core pillar of its long-term decarbonisation strategy. Countries like Germany, France, and the Netherlands are investing heavily in geothermal exploration and enhanced geothermal systems.
The Cornwall project aligns directly with this continental trend. ABN AMRO’s involvement signals confidence not just in a single company, but in the broader geothermal sector as a scalable investment class.
As European electric vehicle adoption accelerates, demand for lithium is expected to rise significantly. Domestic production sources like Cornwall could help stabilize supply chains and reduce exposure to global price volatility.
Engineering challenges and long-term potential
Despite its promise, geothermal lithium development is not without challenges. These include:
- High upfront drilling costs
- Reservoir uncertainty in deep geothermal systems
- Scaling DLE technology efficiently
- Managing mineral extraction economics
However, Cornwall’s geology provides a rare advantage. The granitic formations in the region are naturally heat-rich and mineral-bearing, making them one of the few viable geothermal lithium environments in the UK.
If successful, the model could be replicated in other regions with similar geological conditions across Europe and beyond.
A new industrial model: energy and materials combined
What makes the Cornwall project particularly significant is that it represents a shift in how infrastructure is designed. Traditionally, energy production and mineral extraction are separate industries. Geothermal lithium merges them into a single system.
This convergence creates a new industrial category:
- Energy-producing mining systems
- Mineral-producing power plants
- Circular subsurface resource economies
In this model, the Earth is not just a source of heat or materials, but a combined resource platform.
Looking ahead: from pilot to platform
The immediate focus for Geothermal Engineering Limited is scaling the United Downs model into a multi-site operation across Cornwall. The long-term vision extends far beyond 2028–2030, targeting a national geothermal-lithium network.
If successful, the UK could become one of the first countries in the world to commercially integrate geothermal power and lithium extraction at scale.
The implications are far-reaching:
- Reduced reliance on imported lithium
- Stable baseload renewable electricity
- Regional economic development in Cornwall
- Creation of a new clean energy industrial base
Conclusion: a quiet revolution beneath Cornwall
The £10 million financing from ABN AMRO is modest in size compared to global energy investments, but its strategic importance is far greater than the figure suggests.
It supports a project that sits at the intersection of energy, mining, finance, and geopolitics. More importantly, it signals growing confidence in geothermal lithium as a viable pillar of the clean energy transition.
Cornwall, once defined by its mining past, is now re-emerging as a laboratory for the future of energy systems—where heat from the Earth is transformed into both electricity and the materials needed to store it.
The next decade will determine whether this model remains a niche innovation or becomes a foundational element of Europe’s energy architecture.
Source :Abnamro
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