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Engineering complex systems that have to meet critical requirements is a difficult task, especially if multiple engineering disciplines are involved. Common practice in domains like the automotive or avionic industry shows that formal methods improve engineering process efficiency for embedded software due to abilities like abstraction, early verification and iterative refinement. This paper presents how existing formal software engineering methods can be adapted to meet the needs of the smart grid domain. A case study demonstrates how we develop a basic interdisciplinary but semantically integrated decomposition of a household including electric and software behavior. Finally, we provide first simulation results to evaluate the feasibility of the model as well as the presented engineering method.