Karl-Heinz Niemann of the University of Applied Sciences and Arts in Hannover talks about energy efficiency in general, about OT-Security, data formats, energy management systems, and about a consolidated energy model to be made available via OPC UA. Karl-Heinz Niemann of the University of Applied Sciences and Arts in Hannover talks about energy efficiency in general, about OT-Security, data formats, energy management systems, and about a consolidated energy model to be made available via OPC UA.