Rob Kreiter is responsible for the research programme Storage & Integration of Renewable Energy at ECN. To ECN, the integration of sustainable energy and storage technology is an essential element of future energy supply. Rob has a background in chemistry and catalysis; at ECN he worked on energy-efficient separation technologies. He is fascinated by developments that extend across several disciplines and sectors, because innovation occurs at the crossroads. In a sustainable energy system, energy storage is a pre-eminent example of such a development.