26 Feb 2026
UK generates first ever geothermal electricity at United Downs
United Downs power plant in Cornwall is now generating the UK’s first ever geothermal electricity, marking a huge breakthrough for the UK’s renewable energy mix.
Having provided the first commercial funding for United Downs in 2020, followed by further investment in 2023 and 2025 to complete construction, we’re really proud to see the landmark project come to life.
The project is owned and operated by Geothermal Engineering Limited (GEL) and will provide 24/7 home-grown baseload power, helping to boost energy security by reducing our reliance on imported balancing power to complement wind and solar.
In another UK first, GEL has started commercial scale production of sustainable lithium carbonate, the key raw material used in the production of rechargeable batteries, including those that power electricity vehicles and energy storage systems. From its February 2026 starting point, United Downs has the capacity to produce 100 tonnes per annum.
“The United Downs project sets a precedent for deep geothermal exploration across the rest of the UK – using previously untapped renewable resources in Cornwall to deliver 24/7 baseload power needed to support the UK’s energy system. It’s exciting that as well as delivering our first ever geothermal electricity, the project will also help to support the UK’s growing EV industry by producing commercial scale lithium for EV batteries. We’re really proud to have been invested in the project from the start and are now looking forward to seeing it deliver positive impact both locally and nationally, providing crucial baseload power and helping to reduce UK carbon emissions.”
“We are proud to be at the forefront of this landmark step for the UK, generating geothermal electricity and lithium by harnessing the resources beneath our feet. This is a huge advancement for geothermal power in the UK and the beginning of our expansion plans. Geothermal energy and critical minerals extraction are naturally complementary as they share the same subsurface resource. The hot, mineral-rich fluids that generate clean electricity can also be processed to recover strategic materials like lithium as well as rare earth minerals. Therefore, collocating power and mineral extraction plants maximises capital investment in the wells, minimises surface disruption (as everything happens underground, not via huge open cast mines at the surface) and accelerates the transition to secure domestic supply in both sectors. The United Downs plants prove that we can do this in a way that benefits the climate and the local and national economy.”
“The UK’s first ever geothermal power is a groundbreaking moment for UK energy innovation, powering thousands of homes with clean, homegrown power.
With zero carbon lithium now being produced here in the UK, British businesses are leading the way in securing the materials needed to power the next generation of electric cars.”
The well at United Downs that produces the geothermal fluid for power and lithium is over 5km deep – the deepest well ever drilled on UK soil. It taps into water exceeding 190°C – the hottest recorded in the UK. After power generation, the fluid is processed to produce technical grade lithium carbonate before being reinjected back underground. The water brought to the surface contains over 340 parts per million (ppm) of lithium, making it one of the highest concentrations found in any well to date in the world. GEL aims to scale its production to over 18,000 tpa over the next decade, enough for circa 250,000 EV batteries a year – 65% of the UK’s 2024 Battery Electric Vehicle (BEV) registrations.
GEL has two other sites currently under development in Cornwall, which will deliver a further 10 MW of base-load geothermal power in the UK by 2030. The British Geological Survey has calculated that more than 200 GW of baseload (24/7) electricity could be produced from onshore geothermal sources. That is the equivalent of over 100 nuclear power stations.
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