The paper describes the use of discrete-event simulation (DES) as an early collaborative decision-support tool for designing an autonomous, electrified waterborne public transportation system, including charging solutions, with embedded resiliency. It presents the design challenge, the role of the DES environment in simulating alternative usage contexts, and its capability to serve as a decision-support tool that enables stakeholders to interactively play with the model and explore future scenarios. The approach is described through its application in the multi-stakeholder design exploration of a waterborne public transportation system in the city of Karlskrona in Sweden. The results highlight the potential of the simulation to support multi-stakeholder decision-making in complex and uncertain scenarios