Rolls-Royce Power Systems, a German subsidiary of Rolls-Royce Holdings (<a href="https://www.londonstockexchange.com/stock/RR./rolls-royce-holdings-plc/company-page" target="_blank">LON:RR</a>), said today it will provide a 12-MW/24-MWh battery energy storage system to Hamburg-based wind and solar park operator Encavis AG (<a href="https://www.boerse-frankfurt.de/equity/encavis-ag" target="_blank">ETR:ECV</a>).