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Imperial battery spinout raises £10m to help store renewable power for days, not hours

Certain Energy, an Imperial College London spinout, has raised £10m to scale manganese flow batteries designed for long-duration electricity storage.

By The TEA Editorial Desk · 28 August 2026

Members of the Certain Energy team at Imperial College London's White City campus Image: Imperial College LondonOriginal source

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A clean-energy company spun out of Imperial College London has raised £10 million to move a new type of long-duration battery closer to deployment on electricity grids.

Certain Energy, formerly RFC Power, is developing manganese flow batteries designed to store renewable electricity for much longer periods than conventional short-duration systems.

The Series A round includes backing from the British Business Bank, Centrica, Ceres Power and Temasek Trust’s Catalytic Capital for Climate and Health. The company plans to expand its UK operation and develop a grid-connected megawatt-hour-scale system in India.

The useful bit is simple: as more electricity comes from wind and solar, grids need somewhere to keep surplus power until it is actually needed. Certain Energy is trying to make that storage cheaper, scalable and based on abundant materials.