Abstract This paper studies and analyzes the energy transition of ferry boats used in Venice as a means of public transportation. Thus, the goal is to reduce their environmental impact by replacing the current installed thermal propulsion with an equivalent low-emission electric type. A study was conducted aimed at sizing the most suitable electric motor and battery pack to be installed, as well as the most suitable charging system for the vehicle and the area involved in this case study. The shift to electric traction will bring new challenges for the service, but also the possibility to decarbonize the water transport in Venice, preserving air quality and the monuments of the UNESCO site. Therefore, it is noted how these changes may impact service delivery.