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Understanding energy use is critical. Although simulation is valuable, such models are simplified abstractions of actual energy systems. The authors present an energy system multimodel implemented with the Language and Platform Independent Steering (LAPIS) computational steering API. They present an adaptable framework for the integration and development of multimodel simulations. This framework enables independent development of component simulations, limits coordination overhead between developers, and allows modularity and flexibility in the overall multimodel simulation. Use case studies demonstrate the capabilities of the multimodel energy system simulation and LAPIS.