Commercial lithium extraction from geothermal brine in Cornwall is scheduled to begin in 2029, according to British company Geothermal Engineering Limited (GEL), which reports progress in project preparations for the planned plant.

The 2029 start date rests on funding commitments from the UK government, GEL says. The company frames the timetable as set, but the project remains at the preparation stage — no production data exists yet to verify the schedule, and the capacity of the planned extraction plant has not been disclosed.

GEL's model couples lithium extraction with geothermal energy production in Cornwall, a region with a long mining history and granite geology that hosts hot brine underground. The company's approach would extract lithium from that brine rather than from hard rock or conventional brine evaporation ponds, which dominate supply from Australia and South America respectively.

The announcement carries weight for the UK's electric vehicle supply chain ambitions. Domestic battery plants — including the AESC facility in Sunderland and Tata's planned £4 billion gigafactory in Somerset — will need lithium feedstock, and most raw lithium processing currently sits outside Europe. A domestic extraction source, if it reaches commercial scale, would shorten that supply chain.

But the timeline is the claim to watch. Lithium extraction from geothermal brine remains technically demanding, and projects in this space have repeatedly slipped from initial schedules. GEL's 2029 target for commercial production is an intention backed by government funding commitments, not a confirmed capacity plan, and the company has not published volumes or investment figures alongside the date.

For UK industrial policy, Cornwall is becoming a test case. Government backing for GEL signals intent to build domestic critical minerals capacity; whether that converts into sustained production depends on the plant hitting its milestones between now and the end of the decade.

What to watch next: the timeline from preparation to construction start at the Cornwall site, any disclosure of planned extraction volumes, and confirmation of the government funding amounts committed to the project.