CMBlu Energy and Uniper Sign Long-Term Framework Agreement for 5 GWh of SolidFlow Large-Scale Battery Storage
Alzenau / Düsseldorf, January 20, 2026 – CMBlu Energy AG and Uniper Kraftwerke GmbH signed a conditional supply agreement on January 20, 2026, establishing a long-term framework agreement for the delivery of at least 5 GWh of Organic SolidFlow battery storage systems. The agreement runs until 2037 and provides Uniper with the option, starting in 2027, to call off battery systems in tranches of at least 100 MWh each.
The signing follows a key technological milestone in the long-standing collaboration between the two companies: the successful completion of the Site Acceptance Test (SAT) of a battery system. The successful technical acceptance confirms the suitability of the technology both for grid services and for future large-scale deployment that is beneficial to both the grid and the market in the multi-hour storage segment.
The framework agreement establishes a reliable basis for the continued expansion of stationary long-duration energy storage in Germany and Europe. The commercial framework defines a development pathway for the potential deployment of at least 5 GWh of storage capacity across multiple project phases, with a perspective extending into the late 2030s. Industrial scaling is closely linked to demonstrated technical maturity, project experience, and market demand.
CMBlu’s SolidFlow battery is based on a unique and patented combination of organic redox flow technology and solid-state storage materials and is specifically designed for market-oriented applications in the multi-hour range. The technology offers the potential for high cycle stability, a service life of several decades, non-flammable electrolytes, and avoids the use of critical raw materials such as lithium, cobalt, or nickel. This makes SolidFlow a sustainable, safe, and scalable alternative to conventional battery storage systems, particularly for applications requiring high utilization rates and long-term operation.
This agreement with Uniper represents an important milestone for CMBlu and for the industrial scaling of our SolidFlow technology. The successful Site Acceptance Test confirms the technical maturity of our solution for use in the energy system. I would like to extend my sincere thanks to both project teams, and in particular to our partners at Uniper, both at headquarters and at the Staudinger power plant site, who worked tirelessly to reach this next milestone. Together, we are laying the foundation for storage solutions that will make the energy system more stable, secure, and independent in the long term.
The Site Acceptance Test marks an important step in our collaboration with CMBlu. The SolidFlow technology shows promising potential; at the same time, its performance and economic viability still need to be further demonstrated in large-scale deployment. The framework agreement allows us to support this development in a prudent and market-oriented manner.
The framework agreement builds on the existing development and project collaboration between the two companies and marks the transition from technology development to commercial scaling.
In addition to the supply agreements, the parties intend to conclude long-term service and maintenance agreements to ensure reliable and high-performance operation of the storage systems over their entire service life.
About CMBlu Energy AG
With its SolidFlow™ technology, CMBlu Energy has developed an industrially scalable battery storage solution that combines safety, sustainability, and performance, setting new standards for stationary energy storage.
Founded in 2014, CMBlu Energy has evolved from one of Europe’s largest lithium-free research laboratories into a global cleantech company. The company manufactures its SolidFlow battery modules in its own fully automated gigafactory in Alzenau and is planning additional production facilities in the United States and Greece. By establishing local supply and value chains, CMBlu strengthens supply security and technological independence in its core markets.
SolidFlow batteries store energy in organic molecules, inspired by nature. The absence of explosive materials makes them safe, the use of socially and environmentally conflict-free raw materials makes them sustainable, and the abundant materials enable scalable and cost-effective sourcing.
CMBlu’s mission is to enable unlimited energy storage inspired by nature—worldwide. Around 250 employees work toward this goal every day, including approximately 150 in research and development. The company is headquartered in Alzenau, Germany, with subsidiaries in Athens, Greece, and Petaluma, USA.
For more information, please visit www.cmblu.com.
About Uniper
Headquartered in Düsseldorf, Uniper is a European energy company with a global footprint and activities in more than 40 countries. With around 7,500 employees, Uniper plays a central role in ensuring secure energy supply in Europe, particularly in its core markets of Germany, the United Kingdom, Sweden, and the Netherlands. With 14 gigawatts of flexible power generation capacity, Uniper forms the backbone of reliable electricity supply.
As a leading gas trader and one of Northwestern Europe’s most important LNG importers, Uniper strengthens security of supply through a broad sourcing portfolio. At the same time, the company is driving the transformation of the energy system through investments in renewable energies, hydrogen, and other low-carbon energy sources.
In its home market of Germany, Uniper supplies around 1,000 municipalities and industrial companies with energy and related services. In addition, Uniper is Germany’s largest operator of gas storage facilities and hydropower plants.
For more information, please visit www.uniper.energy.