A 50MW lithium-ion battery storage system which will form part of a transmission system-connected ‘Energy Superhub’ has been commissioned in Oxford, England, while another 100MW transmission-connected project in the country has reached financial close and is set to begin construction soon.

Axion Power International, focusing on “hybrid battery technology” that combines lead acid with the properties of carbon-based supercapacitors, has warned that it is in financial trouble after failed attempts to commercialise its devices.