Germany may be sitting on one of the world’s largest lithium resources, hidden thousands of meters beneath a region long associated with natural gas production. New developments in the Altmark area of Saxony-Anhalt suggest that what was once a major fossil fuel basin could now become a strategic source of battery materials. The discovery is drawing attention across Europe as countries race to secure critical minerals needed for electric vehicles and renewable energy storage systems.
The Altmark region has been linked to gas extraction since 1969, building decades of industrial expertise and infrastructure. Rather than opening a traditional mine, energy company Neptune Energy is repurposing this legacy network to tap lithium-rich brine trapped deep underground. The shift allows existing wells and industrial facilities to support a new phase of resource development focused on battery metals instead of hydrocarbons, as detailed in the company’s official announcement published on its media centre website.
What makes the project unusual is the extraction method. Instead of digging vast open pits or constructing evaporation ponds, the company plans to use direct lithium extraction technology. This process filters lithium from hot underground brine and reinjects the remaining fluids back into the reservoir, reducing surface disruption. Because Altmark already hosts extensive subsurface infrastructure from decades of gas production, much of the technical groundwork is already in place.
The initiative has progressed beyond laboratory testing. Neptune Energy confirmed that its second pilot program concluded in August 2025, successfully producing battery-grade lithium carbonate through an ion exchange process. A third pilot began weeks later to test adsorption technology, while preparations continue for a larger demonstration facility that would integrate the entire extraction system. For a region filled with pipelines and industrial installations, the equipment may appear familiar even though the final product is now destined for battery supply chains.
Geological research has strengthened confidence in the basin’s potential. Studies indicate that highly mineralized brines lie between roughly 3,200 and 4,000 meters below ground in sandstone and volcanic formations. Elevated temperatures in these deep layers enable chemical reactions that release lithium from surrounding minerals into underground fluids. Experts describe the reservoir as a stable and chemically consistent system rather than a random concentration, suggesting the resource could support long-term extraction.
After technical validation, the project moved toward commercial evaluation. Independent assessors estimated that Neptune Energy’s licensed areas in northern Saxony-Anhalt contain around 43 million tons of lithium carbonate equivalent. That figure elevates the project from an experimental initiative to one of Europe’s most significant lithium prospects, positioning Germany within the global battery materials race.
The timing is significant as European policymakers push to reduce reliance on distant suppliers of critical minerals. Securing domestic sources has become a strategic priority amid growing demand for electric vehicles, grid storage, and clean energy technologies. Projects like Altmark demonstrate how older energy regions may adapt to new industrial needs without starting entirely from scratch.
Despite the scale of the estimate, full commercial production is still years away. Additional permits, expanded pilot operations, and a large demonstration phase are required before extraction can reach industrial scale. Neptune Energy is presenting Altmark not as a finished supply hub but as a technically validated project ready for its next stage of development.