Recent moves in California to develop large-scale energy storage with four hours’ storage duration are just the beginning of a move towards using batteries as a capacity resource, the president of flow battery company CellCube has said.

It’s been predicted for some time that the redox flow energy storage space will, after some turmoil and rapid consolidation, find success in providing energy storage at durations of more than four hours. This past couple of weeks have been a tale of both turmoil and success.