CMBlu Energy has exceeded a €1 billion valuation after securing an initial €50 million close of its Series C funding round, marking its transition to “unicorn” status. The financing round included participation from Samsung Ventures and follow-on investments from all existing backers, including STRABAG SE, underscoring continued support for CMBlu’s long-term strategy and execution. This milestone coincides with growing demand from data centers and utilities for reliable, always-on energy storage solutions.
At the core of CMBlu’s offering is SolidFlow, a non-lithium, long-duration battery architecture designed to provide ten hours or more of dispatchable energy. By combining water-based electrolytes with proprietary solid energy storage materials, the system decouples power from energy capacity, enabling cost-effective scaling to multi-gigawatt-hour deployments. Built from earth-abundant, recyclable materials, SolidFlow also avoids foreign-entity-of-concern supply chains and meets infrastructure-grade performance standards.
“SolidFlow’s inherent safety and streamlined permitting pathway enable faster, more predictable deployments at scale,” said Constantin Eis, CEO of CMBlu. “Customers powering critical operations require energy they can depend on through the night and under real-world conditions. CMBlu’s technology meets those needs, and the market is rewarding dependable, high-performance solutions.”
A spokesperson for Samsung Ventures added that the firm is focused on supporting technologies that underpin a cleaner, more resilient energy infrastructure. “CMBlu’s approach to scaling sustainable, long-duration energy storage positions the company as a key enabler of the global energy transition, meeting the rising power demands driven by AI and electrification.”
The Series C initial close will fund manufacturing scale-up and accelerate early commercial deployments in Europe and the United States. CMBlu has already secured a 5 GWh framework agreement with European utility Uniper—equivalent to powering a 1 GW data center for five hours or a 500 MW facility for ten hours. By shifting excess daytime generation into peak and overnight demand periods, SolidFlow helps data centers access low-cost electricity while maintaining uptime and supporting grid stability.
As electricity demand from AI, electrification, and industrial growth accelerates, CMBlu is positioning its advanced duration energy storage as foundational infrastructure for a reliable, resilient, and economically competitive energy system.
Source: CMBlu Press & Media
