10 Project Finance Lessons from Europe’s Geothermal-Lithium Lighthouse

This case study by RMI examines the financing of the Lionheart project in Germany, a first-of-a-kind industrial facility integrating geothermal power, lithium extraction from brines, and on-site lithium hydroxide production. The document details the €2.2 billion financing package closed in December 2025 and outlines ten financial and operational de-risking strategies used to attract international investors despite geopolitical uncertainty and volatile lithium prices.

• The Lionheart project in Germany's Upper Rhine Valley secured a €2.2 billion (US$2.5 billion) construction package in December 2025. Scheduled for completion in 2028, the facility aims to produce lithium hydroxide monohydrate (LHM) sufficient for 500,000 electric vehicle batteries annually and provide heat for 90,000 homes.
• To manage the volatility of lithium prices and protect lenders, the project implemented several financial safeguards: a pricing structure consisting of "fixed, floor-ceiling, and index-based floating prices," a conservative debt-to-equity ratio of 60:40, and a €108 million Commercial Standby Facility. Additionally, the construction budget of €1.476 billion includes a 15% contingency, and a "sweep" mechanism ensures extra cash replenishes reserve accounts before equity owners are paid.
• The project utilized diverse equity and capital sources to reduce risk, including a €150 million equity investment from Germany's state-owned development bank, KfW, for a 14% stake. Vulcan also listed shares on the Australian stock market to access liquid capital and provided construction firm HOCHTIEF with "preferred supplier status" in exchange for €169 million in equity.
• Operational risks were mitigated through a series of proof-points, including a pilot run since April 2021 and the completion of lithium extraction and electrolysis optimization plants in 2023 and 2024. The project further reduces risk by using a behind-the-meter geothermal power source to avoid grid volatility and by vertically integrating the extraction and refining of battery-quality LHM on-site.

APA

RMI (2026). 10 Project Finance Lessons from Europe’s Geothermal-Lithium Lighthouse. https://rmi.org/resources/10-project-finance-lessons-from-europes-geothermal-lithium-lighthouse/

Chicago

RMI. 10 Project Finance Lessons from Europe’s Geothermal-Lithium Lighthouse. 2026. https://rmi.org/resources/10-project-finance-lessons-from-europes-geothermal-lithium-lighthouse/.

Wikipedia

{{cite report |author=RMI |title=10 Project Finance Lessons from Europe’s Geothermal-Lithium Lighthouse |date=24 March 2026 |url=https://rmi.org/resources/10-project-finance-lessons-from-europes-geothermal-lithium-lighthouse/ |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{rmi2026project, author = {{RMI}}, title = {{10 Project Finance Lessons from Europe’s Geothermal-Lithium Lighthouse}}, institution = {RMI}, year = {2026}, month = mar, url = {https://rmi.org/resources/10-project-finance-lessons-from-europes-geothermal-lithium-lighthouse/}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }