Vulcan Energy’s Frankfurt Lithium Plant Breaks Ground as Cash Burn Worries Weigh on Shares

Vulcan Energy launches construction of its Lionheart lithium plant in Frankfurt, but a 14% stock slide highlights market concerns over costs and industrial-scale risks.

The ceremonial first shovel has been turned in Frankfurt, but the market’s attention is fixed squarely on Vulcan Energy’s bank balance. The German lithium developer officially launched construction of its central lithium chemicals plant at Industriepark Höchst on Wednesday, with Hesse’s state premier Boris Rhein and Frankfurt’s mayor Mike Josef on hand to mark the occasion. The state is chipping in €13.9 million in subsidies for the facility, dubbed Lionheart, which is designed to produce 24,000 tonnes of lithium hydroxide monohydrate annually — enough for roughly 500,000 electric-vehicle batteries.

Yet even as political heavyweights celebrated the milestone, Vulcan’s stock took a 14 percent hit in Frankfurt trading on April 23, sliding to €1.97. The selloff came the same day the company disclosed a multi-million-euro contract with French materials specialist Mersen, which will supply an Eco&FLEX® conversion unit for the Höchst site. That unit transforms lithium chloride into lithium hydroxide while recovering chlorine and process energy, relying on Mersen’s proprietary isostatic graphite and carbon impregnation technology to produce high-purity hydrochloric acid. The deal closes out the Lionheart supply chain, following a €40 million automation and building-services contract awarded to Siemens for three core sites in the Upper Rhine Valley.

Production timeline and technology

The 80,000-square-metre Höchst site will run on Vulcan’s proprietary VULSORB® adsorption process, which extracts lithium from geothermal brines with over 90 percent efficiency. The plant doubles as an energy generator, producing 275 GWh of electricity and 560 GWh of heat annually as byproducts from the thermal energy of the brine. Vulcan expects the facility to operate for 30 years with near-CO?-neutral production.

All construction and permitting documents for the Frankfurt site are in place, with commercial operations targeted for 2028. The company has already secured a five-year royalty exemption for its lithium extraction in Rhineland-Palatinate, running through the end of 2030, which should ease the financial burden during the ramp-up phase. The overarching risk remains whether the pilot-scale results can be replicated at full industrial scale — a question that will only be answered once the plant is up and running.

Offtake commitments and drilling activity

On the demand side, Vulcan’s position looks solid. Offtake agreements are in place with Umicore, LG Energy Solution, Stellantis and Glencore. LG Energy Solution is contracted for 31,000 tonnes of lithium hydroxide monohydrate over six years, Umicore for 23,000 tonnes over the same period. Stellantis has locked in 128,000 tonnes over ten years, while Glencore’s deal ranges from 36,000 to 44,000 tonnes over eight years.

The main drilling phase is scheduled for the second half of 2026, with parallel operations already underway at the Schleidberg and Trappelberg sites. That simultaneous activity is expected to accelerate cash burn significantly.

Cash position under the microscope

Vulcan ended December with €523 million in cash, having secured total financing of €2.2 billion. But operating expenses ran at €7.2 million in the prior quarter, and the concurrent drilling campaigns will push that figure higher. The market will get its first look at first-quarter numbers on April 29, when the company reports earnings. The analyst consensus price target stands at €4.45, implying roughly 70 percent upside from the recent close of €2.62 — but whether that gap narrows depends heavily on how deep the cash drain actually was in the opening months of 2026.