Primus Power is among a handful of makers currently commercialising their flow batteries, with rivals that include RedT, VIZn Energy and Redflow. Early customers have included Microsoft, which installed a Primus battery at its corporate HQ in a pilot project. Andy Colthorpe spoke with Primus Power CEO Tom Stepien to learn more.

California-headquartered grid-scale electrical energy storage company Primus Power has secured US$32 million in equity financing from a range of investors including a well-known Saudi family, to help accelerate its EnergyPod 2 storage system.