This paper focuses on the concept design of a passenger ship tailored to accommodate the needs of 100 passengers, distinguished by its fully electric propulsion with batteries for electric energy storage and the integration of solar panels. Operates in year-round navigation short-sea services, with a typical operational profile of approximately 3 nautical miles distance followed by 30 minutes of sailing and 30 minutes of charging time, targeting a service speed of 7–8 knots. The benefits of the catamaran passenger ship are given as a sustainable coastal means of sea transportation that incorporates technologies to enhance comfort, operational efficiency, and environmental sustainability. As a result, the developed concept design incorporates an inclusive general arrangement for the required number of passengers. Following that, a hull form was created in terms of the efficiency of the electric propulsion, while the power was obtained by several methods. Evaluation of masses and the definition of the centre of gravity allowed for stability calculations for six scenarios, according to the Croatian Register of Shipping. Lastly, the ship’s operational profile was learned, and the energy balance and battery pack calculations and options were performed with sensitivity analysis for the possible solutions of the range of displacements.