VRB Energy, a maker of flow batteries headquartered in Canada and owned by a metal resources and mining company, said the first phase of a 40MWh flow battery project in China has now been commissioned.

Leclanché and VRB Energy, two providers in very different areas of energy storage, have struck up joint ventures (JVs) intended to assist them in scaling up and hitting new markets, while Ice Energy has netted fresh funding.

First developed by NASA, flow batteries are a potential answer to storing solar – and wind – for eight to 10 hours, far beyond what is commonly achieved today with lithium-ion. In the first of a two-part special report, Andy Colthorpe learns what the flow battery industry faces in the fight for commercialisation.