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CMBlu Energy, an organic flow battery company, has closed a €50 million Series C financing round with participation from Samsung Ventures, bringing its valuation above $1 billion. Existing investors, including technology group Strabag SE, also participated in the round. CMBlu's SolidFlow battery energy storage system combines organic redox flow technology with solid-state storage materials, designed for multi-hour energy storage. The technology uses carbon-based chemistry, avoiding conflict materials and rare earth elements, whilst stationary solids in the tank improve energy density. The company has signed an agreement with Uniper valid until 2037 for battery systems in batches of at least 100MWh, with deliveries starting in 2027. CMBlu's technology avoids foreign entity of concern restrictions in the US and targets applications including data centres and grid-scale storage.

CMBlu achieves unicorn status: SolidFlow developer now valued at over one billion euros. 50 million euros in Series C funding will drive the scaling up of production of the non-lithium SolidFlow battery in Europe and the US. 05-May-2026 Symbolic image AI-generated image CMBlu Energy has reached unicorn status, crossing the €1 billion valuation threshold following a €50 million initial close of its Series C financing with participation from Samsung Ventures. All existing investors, including STRABAG SE, also joined in the round, underscoring sustained confidence in CMBlu's strategy and long-term execution. This milestone reflects accelerating commercial validation as data centers and utilities seek dependable, always-on energy solutions at scale. CMBlu is the sole inventor of SolidFlow, a new class of non-lithium long-duration energy storage engineered for high-energy, multi-hour applications. Designed to deliver ten hours or more of dispatchable energy, SolidFlow addresses one of the most urgent structural constraints limiting hyperscale growth - how to secure dependable, multi-hour capacity as electricity demand outpaces grid expansion. "Our SolidFlow technology is redefining energy storage by combining inherent safety with a streamlined permitting pathway - enabling faster, more predictable deployment at scale," said Constantin Eis, CEO of CMBlu. "That speed to power paired with resilient, localized supply chains is critical as data centers and industrial customers advance their business needs and race to meet surging demand. Customers powering critical operations need energy they can count on through the night and under real-world conditions while maximizing efficiency. CMBlu's innovative battery tech makes this possible and the market is rewarding technologies that can deliver superior performance and dependability." A new storage architecture for the energy transition. CMBlu's SolidFlow technology represents a breakthrough departure from lithium-dominated storage, introducing a longer duration architecture purpose-built for multi-gigawatt-hour deployment. The system combines non-flammable, water-based electrolytes with proprietary solid energy storage materials while decoupling power from energy capacity and enabling cost-effective scaling. Built from earth-abundant, recyclable materials, SolidFlow avoids foreign-entity-of-concern (FEOC) supply chains for customers in the United States while supporting long-life, infrastructure-grade performance. "At Samsung Ventures, we are committed to identifying technologies that serve as the backbone of a cleaner, more resilient energy infrastructure," said a spokesperson on behalf of Samsung. "CMBlu's innovative solution stands out as an industry leading approach to scaling sustainable, long-duration energy storage solutions and positions the company as a key enabler of the global energy transition. This partnership underscores our dedication to supporting technologies that not only accelerate energy innovation but also meet the rising power demands of an AI and electrification driven world." The initial close of Series C will support manufacturing scale-up and accelerate early commercial deployments in Europe and the United States. As proof of this market momentum, CMBlu has secured a 5 GWh framework agreement from one of Europe's leading utilities, Uniper, reinforcing the role of SolidFlow in enabling grid responsiveness. This is equivalent to: * Powering a 1 GW data center for five hours * Supplying a 500 MW data center for ten hours, covering the full overnight window when solar generation drops to zero By shifting excess daytime generation into peak and overnight demand periods, SolidFlow enables data centers to operate on some of the lowest-cost electricity available while maintaining uptime and grid stability. As electricity demand from AI, electrification, and industrial growth accelerates, CMBlu is positioning advanced duration energy storage as foundational infrastructure for a reliable, resilient, and economically competitive energy system.

CMBlu Energy has achieved unicorn status with a valuation exceeding €1 billion following a €50 million initial close of its Series C round. Samsung Ventures participated alongside existing investors including STRABAG SE. The German company has developed SolidFlow, a non-lithium long-duration energy storage system designed for high-energy applications requiring ten hours or more of dispatchable power. The technology uses non-flammable, water-based electrolytes and earth-abundant materials, avoiding foreign-entity-of-concern supply chains. CMBlu has secured a 5 GWh framework agreement with European utility Uniper. Founded in 2014, the company employs over 250 people and operates an automated gigafactory in Alzenau, Germany, with additional facilities planned in the United States and Greece. The funding will support manufacturing scale-up and commercial deployments.