Flapping-foil thrusters arranged below the hull of the ship are examined for the exploitation of energy from wave induced motions by direct conversion to useful propulsive power. In the framework of Seatech H2020 project (https://seatech2020.eu/) flapping-foil thruster propulsion innovation is examined, in combination with standard propulsion system based on optimally controlled Dual Fuel engine, aiming at an increase in fuel efficiency and radical emission reductions of NOx, SOx, CO₂ and particulate matter. In this paper, the combined performance of the above systems is examined for a short-sea shipping scenario in selected geographical areas as the North Sea and the Atlantic for specific types of vessels of interest. The analysis is based on a simplified approximation using also data from systematic series. The results show that: (i) flapping-foil thrusters can directly convert kinetic energy from the ship motions into thrust to augment the overall propulsion in waves, (ii) additional thrust generated by the foils will enable the engine to operate in part-load without compromising vessel speed, resulting in an additional positive effect on its emission profile, and (iii) the foils can improve the dynamic stability of the ship.