Sinergy Flow is a Milan-based startup founded in 2022 that has created a proprietary flow battery technology capable of delivering more than eight hours of continuous energy storage. The system is built around inexpensive, sulfur-rich industrial by-products, enabling a circular-economy approach across the device’s full lifecycle. By offering long-duration storage, the company aims to facilitate the integration of renewable energy sources into electricity grids and provide utility-scale as well as standalone grid-support applications. With its technology, Sinergy Flow targets markets that require reliable, long-term storage to balance intermittent renewables. The company is currently moving from laboratory success toward commercial-scale validation. Proceeds from its recent seed round will finance industrial development and help prepare the product for market entry. No operating revenue or user metrics have been disclosed to date.

Total raised

$10M

Funding rounds

2

Latest round

Seed

Latest activity

Feb 2026