Elements Green said today that work is starting on the site of its 360-MW/720-MWh Staythorpe battery energy storage system (BESS) project in Nottinghamshire after the company signed a contract with a subsidiary of UK services company Mitie Group PLC (<a href="https://www.londonstockexchange.com/stock/MTO/mitie-group-plc/analysis" target="_blank">LON:MTO</a>).