It is beneficial to combine simulation models via I/O data exchanges. The Knowledge Interchange Broker (KIB) modeling approach can be used to develop interaction models that also have time, state, operations, and concurrency. A unique advantage of the interaction model is the composed models can have their own specifications. The KIB is used to model the nexus of the water and energy models of city metropolises. The RESTful WEAP, LEAP, and DEVS-Suite are used to model and simulate the composition of hybrid water, nexus, and energy models. The performance measurements of the simulations of these integrated simulators are evaluated. The results show the DEVS and Algorithmic interaction models have nearly identical computational times. These simulation times are contrasted with the use of links that share data between WEAP and LEAP models. This research highlights the interaction model flexibility and visibility at almost twice the computational time cost for data sharing.