A Granite Revolution

United Downs is more than a power plant; it is a blueprint for regenerative finance. It demonstrates that patient, purposeful capital can unlock high-integrity resources while maintaining a deep social license to operate.

Walking through the streets of Redruth, you can feel the weight of history. This was once the richest mile in the world, the beating heart of the industrial revolution where Cornish tin and copper powered global progress. But as I joined a group of investors from Thrive Renewables yesterday to visit the United Downs Geothermal plant, it felt like I was witnessing the birth of a new era - one that doesn't just extract from the earth, but works in harmony with it.

Redruth: A town built on mining heritage, now looking to the heat beneath its feet.

As an ex-Schlumberger wireline engineer, I have spent a significant portion of my career fascinated by what happens down-hole. I have seen the scale and complexity of traditional extractive industries, often celebrated for their profits but increasingly vilified for their environmental cost. Coming to United Downs felt like a homecoming to the technical world I love, but through a radically different lens… dare I say it Wealth With A Why.

The plant itself is remarkably unassuming. Tucked away in an industrial park, the surface footprint is roughly the size of a football field. It is a compact, clean-lined operation of metal and pipework that belies the staggering engineering feat beneath.

On site with the teams from GEL and Thrive Renewables, seeing capital in action.

We are talking about the deepest onshore well in UK history. To reach the super-heated brine required to drive the turbines, the team had to drill over 5 kilometres down into the radiogenic granites of the Cornubian Batholith. At that depth, the water exceeds 190°C. Unlike shallow geothermal projects that often sprawl horizontally and can interact with the water table, this is a vertical operation, pulling from a depth that is entirely isolated from the environment we inhabit.

Schematic of the geothermal doublet that has been drilled into a natural granite fault zone in Cornwall.

One of the most powerful moments of the visit was the technical reassurance regarding water safety. We asked difficult questions about community engagement and the local water supply. The answer was definitive: the well was drilled with fresh water to well below the water table and sealed with three layers of cement and steel before the deeper drilling even commenced. 

This is authentic progress - engineering that respects the boundaries of our natural capital.

The live chemistry lab where technical-grade lithium is produced with near-zero carbon emissions.

But the story doesn't end with 24/7 baseload electricity. United Downs is also a live chemistry lab. The same geothermal fluid that powers the grid is rich in lithium—a critical mineral for the electric vehicle revolution. The plant uses Direct Lithium Extraction (DLE) to recover this resource in a gentle way, avoiding the massive evaporation ponds and land degradation seen in overseas mining.

For me, this visit was a manifestation of Financial Ikigai. It is something the world needs (clean energy and minerals), something the Cornwall teams are exceptionally good at (leveraging a deep mining DNA), and a source of long-term security. It shows that we can hospice old, extractive industries and birth new, impactful ones. It is about redeploying the incredible talent from the oil and gas sector into a regenerative future.

Innovation meeting the urgent needs of the energy transition.

Nothing in life is simple, and scaling this model to new sites like Penhallow and Manhay will require continued tenacity. But after seeing the team at work and the lithium being produced, I am convinced that this is a good path forward. If we are going to reach the stellar world that is possible with abundant energy, we need more projects like United Downs that put regenerative practices front and centre.

United Downs is a showcase that - when ambitious investors and visionary companies come together - we can unlock the treasure beneath our feet without costing the earth.

To learn more about the project and the technical details of the UK's first deep geothermal plant, visit the website (https://gel.energy/about/united-downs/).