Electric utilities are increasingly using IT applications, such as maintenance management and geographical information systems, in order to support their business processes, for instance repairs and construction, or asset management and network extension planning. However, performing these business processes efficiently often requires access to information from different sources, departments and IT systems. We have developed a concept for system integration for utilities, where the aim is to provide data integrity between operational automation and control systems and other information management systems. Guided by a use case, we demonstrate the interaction of a directory service, application adapters and a communication infrastructure on top a common data model and acting across application boundaries