Willenhall Energy Storage System (WESS) - UK’s largest research based grid-connected battery energy storage facility 

Based at the Willenhall substation near Wolverhampton in the West Midlands, part of the Western Power Distribution Network, the facility is owned and operated by the energy storage research team at the University of Sheffield, in conjunction with partners at Aston University and the University of Southampton. The £4m facility was officially launched March 2016 with the announcement of a new innovation project with energy companies E.ON and Uniper looking at future possibilities for large-scale energy storage and how to overcome the challenges associated with connecting such technologies to the grid.