The main objective is to determinate the feasibility of Dual-Fuel retrofitting for engines present in Short Sea Shipping vessels. To accomplish this main objective there are other secondary objectives: - Integrate future environmental regulations to this paper forcing its achievement in this study - Determinate present day technologies capable to accomplish environmental regulations - Definition of shipping routes to study the proposed viability - Determinate the study vessel to obtain its measurements - Study Dual-Fuel, and other main engine types - Study Dual-Fuel and Scrubber System vessel’s retrofitting - Review of bunkering prices to do comparisons and to create different future scenarios according to the possible price evolution