Long-duration energy storage has a cost problem, and Certain Energy is betting its hybrid flow battery design is the fix. The company has raised $13.6M in a Series A round, a vote of confidence from a backer list that spans state-backed finance and industrial heavyweights.
The round includes British Business Bank, Centrica, Ceres, and Temasek Trust’s Catalytic Capital for Climate and Health. Certain Energy’s pitch is straightforward: low-cost, long-duration batteries built for grid-scale storage, where the economics of lithium-ion often fall short. With this capital, the company can push its technology closer to commercial deployment-though specifics on timelines or pilot projects weren’t disclosed.

















