Vattenfall’s battery@pyc, the largest co-located battery installation in the United Kingdom, is now operational and stores renewable wind power from Vattenfall’s 76-turbine Welsh onshore wind farm Pen y Cymoedd.The 22MW facility, which shares electrical infrastructure with the Pen y Cymoedd wind farm, will help UK National Grid maintain frequency levels and reliability of electricity supply, by storing electricity produced by the wind farm. The battery is made up of six shipping container sized units, five of which house 500 i3 BMW manufactured battery packs. It uses new lithium-ion batteries with a capacity of 33 kilowatt hours (kWh) supplied by BMW and adapted for a stationary application.