A new Google data centre in Pine Island, Minnesota, will be powered by variable renewables and an iron-air storage system that’s set to become the largest battery facility in the world by capacity. The clean energy hub, to be developed by Xcel Energy, will include 1,400 MW of wind, 200 MW of solar and 300 MW / 30 GWh of long-duration energy storage provided by Form Energy. For context, the world’s biggest battery facility by capacity today is the 3.3 GWh Edwards & Sanborn unit in California.