This session focuses on the key lessons learned from executing new build and retrofit projects which required hybrid propulsion. The presentation will examine the key commonalities and differences between new builds and retrofits, as well as the opportunities and challenges presented to the system integrator, shipyard(s), and operator(s) for both project types. The goal is to provide guidance to attendees who may be considering taking on a retrofit or new build with hybrid propulsion and are in the process of weighing their options.