Large scale storage is essential to the future of energy. And Cumulus, based in Sheffield and San Francisco, delivers renewable power at the time it is needed.

Aiming to be the leading manufacturer and developer of grid-level batteries, its low-cost storage has attracted significant funding, including £800,000 from the Government and a £25m B round.

See more of our 101 tech start-up disrupters here.

And check out our 101 rising stars of tech - the exciting firms which did not make the main list but have the potential to grow.