Sinergy Flow, a deep tech start-up that develops innovative solutions for long-term energy storage, has announced that it has closed a €7 million late seed investment round. The transaction is led by CDP Venture Capital through the Corporate Partners I – EnergyTech Fund and the Green Transition Fund, with the participation of the European investment vehicle 360 Capital, Tech4Planet, the National Technology Transfer Hub for Sustainability created on the initiative of CDP Venture Capital SGR through the Technology Transfer Fund, and Exergon, a Paris-based venture capital fund focused on innovative solutions for the energy transition.
Founded in 2022 by Alessandra Accogli (CEO), Gabriele Panzeri (CTO), and Matteo Salerno (COO) (pictured) with the aim of enabling a sustainable, scalable and accessible energy transition, Sinergy Flow develops proprietary technology based on innovative, low-cost flow cell batteries for long-duration stationary storage applications, exceeding eight continuous hours. The technology allows for high integration of renewable sources into electrical systems, while at the same time valorising sulphur-rich industrial by-products and promoting a circular economy model throughout the device’s life cycle.
As part of a concrete technology transfer process, from concept to product, Sinergy Flow has now scaled the device more than 10,000 times compared to the early stages of development, working on materials engineering, system architecture and battery management and control logic. This process has already led to the creation of a proof of concept in collaboration with A2A and the launch of an industrial partnership aimed at validating the technology in a real-world application and preparing for the industrialisation phase.
The investment round aims to accelerate the industrial development of the technology, complete commercial-scale validation activities and prepare for market entry in the utility-scale energy storage, standalone applications supporting electricity grids and renewable energy segments.
“This round marks a key milestone,” Accogli said in a statement. “The energy transition is not just a technological challenge; it also depends on the resilience of infrastructure. Without long-term storage, a system based on renewables remains structurally unstable; without solid and accessible supply chains, innovation cannot scale. Our technology was created to address both of these challenges, combining reliability, sustainability, supply chain independence and industrial scalability, and our team has already demonstrated a strong ability to execute. The support of new investors and the renewed confidence of existing ones reinforces this vision and accelerates our path towards industrialisation and the market.”
Alessandro Scortecci, Director of Direct Investments at CDP Venture Capital, comments: “Sinergy Flow is a concrete example of successful technology transfer. We strongly believe in the team and their ability to scale the technology and establish industrial partnerships. Continuing to invest in this company, and indeed renewing our commitment, means promoting an increasingly sustainable and accessible energy transition, with solutions that reduce emissions and make clean energy available on a large scale. Their technology not only promotes the integration of renewable sources, but also enhances industrial by-products, promoting a circular economy model.”
Lucrezia Lucotti, partner at 360 Capital, states: “The work carried out by Sinergy Flow in recent years, made possible in part by its strategic partnership with A2A, demonstrates how it is possible to bring such disruptive technology to the industrial world. The results achieved so far confirm a concrete competitive advantage in the Long Duration Energy Storage segment. We continue to believe in the sector and in the ability of this technology to enable new solutions for the energy transition.
Anna Teyssot, partner at Exergon, states: “Sinergy Flow offers a robust and scalable long-duration energy storage solution at a time when electricity grids urgently need flexible, safe and cost-effective technologies. We are convinced of the founding team’s ability to transform their research into an industrial product and are delighted to accompany them in the transition from pilot systems to commercial deployment. This transaction also represents Exergon’s first investment in Italy.
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