The overall aim of the Energy Keeper project is to design, develop and test a novel, scalable, sustainable and cost competitive flow battery based on organic redox active materials. A 30kW redox flow battery with a capacity of 100 kWh will be constructed and equipped with an interoperable Battery Management System enabling plug and play integration into a Smart Grid. The developed technologies will be integrated with real RES (Renewable Energy Sources), Electric Vehicle chargers and variable power consumption demonstrated at the ACRRES test site. Finally Energy Keeper will develop several prosumer business models oriented to different types of communities in order to demonstrate that EnergyKeeper storage system will bring economic profit to end-users while providing stability to the electricity grid.