CMBlu Energy, an organic solid flow battery technology developer, announced the completion of a €50 million (~$58.5 million) initial close of its Series C funding round, bringing the company’s valuation to over a €1 billion (~$1.17 billion).

The round included participation from Samsung Ventures, alongside existing investors, including STRABAG SE.

The company develops SolidFlow, a non-lithium, long-duration energy storage technology, designed to deliver ten hours or more of dispatchable energy. According to CMBlu, the system uses non-flammable, water-based electrolytes and proprietary solid energy storage materials.

CMBlu said the proceeds will support manufacturing scale-up and early commercial deployments in Europe and the U.S.

“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.”

In 2023, the company secured €100 million (~$105 million) equity investment from globally operating technology and construction group STRABAG SE to scale up its battery technology production.

Founded in 2014, the company is scaling its manufacturing operations through an automated gigafactory in Alzenau, Germany, with additional facilities planned in the U.S. and Greece. CMBlu said its technology uses recyclable materials and avoids foreign-entity-of-concern supply chains for customers in the U.S.

According to Mercom’s Annual and Q4 2025 Funding and M&A Report for Energy Storage report, VC funding in the Energy Storage sector in 2025 increased 30% YoY, to $4.8 billion across 75 deals, up from $3.7 billion across 84 deals in 2024.

In February 2026, Sinergy Flow, a startup that develops solutions for long-duration energy storage, closed a €7 million (~$8 million) late seed funding round.