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Recent changes in the German energy sector forces energy companies to adopt their processes and IT-Systems. As a consequence intensive interaction is required amongst many different actors that now have to participate in intercompany business processes. One way to mitigate the issue of this additional information overload is the dedicated application of modern ICT systems. The Smart Architecture is being developed as a decentralized approach to connect the different players of the energy sector and support open and flexible communication. This paper illustrates the potential of the Smart Architecture and describes the functionality and interaction of its basic services based on a full scale use case, the web-based change of supplier.