As a university spin-off our mission is to transfer latest energy research to real applications for various industries. In the large-scale demonstrator ETA-Fabrik at the Lichtwiese campus of Technische Universität Darmstadt, together with the research group ETA | Energy Technologies and Applications in Production, we indicate how energy costs and CO2 emissions can be significantly reduced by means of modern technology. Because there is still enormous potential for energy system optimization to be identified, we are continuing our research into future technologies for data-supported energy management.