Sinergy Flow, a deep tech startup developing innovative solutions for long-duration energy storage, closes a €7 million funding round late seed led by CDP Venture Capital SGR, with the participation of 360 Capital, European venture capital fund, and Tech4Planet, the National Technology Transfer Hub for Sustainability, established by CDP Venture Capital SGR through the Technology Transfer Fund, and Exergon, part of Audacia Group, a European venture capital fund.
Founded in 2022 by Alessandra Accogli (CEO), Gabriele Panzeri (CTO), and Matteo Salerno (COO) with the mission to enable a scalable, sustainable, and accessible energy transition, Sinergy Flow has developed a proprietary technology based on innovative low-cost flow batteries for long-duration stationary storage, exceeding eight hours of continuous operation. The technology enables a greater integration of renewable energy sources into electricity systems while valorizing sulfur-rich industrial byproducts and promoting a circular economy model across the full lifecycle of the device.
Through a structured technology transfer process from concept to product, Sinergy Flow has already scaled the device by over 10,000-fold compared to the earliest development stages. This work has focused on materials engineering, system architecture, and battery management and control systems. The process has resulted in the implementation of a Proof of Concept in collaboration with A2A, a leading Italian multi-utility company, as well as the launch of an industrial partnership aimed at validating the technology in real operational conditions and preparing for industrial-scale deployment.
The funding will enable Sinergy Flow to accelerate the industrial development of its technology, complete commercial-scale validation activities, and prepare for market entry in utility-scale energy storage and standalone applications supporting electricity grids and renewable energy integration.
“This round represents a key milestone,” says Alessandra Accogli, CEO and Founder of Sinergy Flow. “The energy transition is not only a technological challenge; it is about the resilience of infrastructure. Without long-duration storage, renewable-based systems remain structurally unstable; without solid and accessible supply chains, innovation cannot scale. Our technology addresses both challenges, combining reliability, sustainability, supply chain independence, and industrial scalability, and our team has already demonstrated strong execution capabilities. The support of new investors, along with the renewed trust of existing ones, strengthens this vision and accelerates our journey towards industrialization and market deployment.”
Alessandro Scortecci, Chief Direct Investments at CDP Venture Capital, comments: “Sinergy Flow is a concrete example of successful technology transfer. We have great confidence in the team’s ability to scale up the technology and forge industrial partnerships. By continuing to invest in this company — and even strengthening our commitment — we are promoting an increasingly sustainable and accessible energy transition providing solutions that reduce emissions and make clean energy available on a large scale. Their technology facilitates the integration of renewable sources and enhances industrial by-products, fostering a circular economy model”.
Lucrezia Lucotti, Partner at 360 Capital, declares: “The work carried out by Sinergy Flow over these years, made possible in part from the strategic partnership with A2A, demonstrates how it is possible to bring such a disruptive technology closer to the industrial world. The results achieved so far confirm a tangible competitive advantage in the Long Duration Energy Storage segment. We continue to believe in the sector and in this technology’s ability to enable new solutions for the energy transition”.
Anna Teyssot, Partner at Exergon, commented: “Sinergy Flow brings a robust and scalable long-duration storage solution at a moment when grids urgently need flexible, safe and cost-efficient technologies. We are convinced by the founder’s team’s ability to turn their research into an industrial product, and we look forward to supporting them as they move from pilot systems to commercial deployment. This transaction also marks Exergon’s first entry into Italy”.
Sinergy Flow was advised in the transaction by BonelliErede, with the legal team composed of Giulia Frangipane, Enrico Goitre and Elena Cozzupoli