British engineering company Rolls-Royce Holdings Plc (<a href="https://www.londonstockexchange.com/stock/RR./rolls-royce-holdings-plc/company-page" target="_blank">LON:RR</a>) has agreed to procure 20,000 MWh of hydropower annually in south Germany from regional energy supplier Stadtwerke Ulm/Neu-Ulm (SWU).