The battery is composed 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 kWh supplied by BMW and adapted for a stationary application.

“This is Vattenfall’s largest battery installation to date, where we make use of synergies at our existing wind farms sites, such as at Pen y Cymoedd or the Princess Alexia Wind Farm in the Netherlands,” Claus Wattendrup, head of Business Unit Solar & Batteries, said. “Hybrid renewable parks will play a larger role in the future, and we are leading this development.”

The 76-turbine Pen y Cymoedd onshore wind farm is capable of meeting the equivalent electricity needs of more than 13% of households in Wales every year. It also boosts delivery of Wales’s climate-change ambitions, displacing in an average year more than 300,000 tons of CO2 from fossil-fueled generation.