In this paper. the main alternative propulsion systems based on internal combustion engines and batteries of a tugboat operating in harbour duties of the tugboat that include Emission Control areas are comparatively assessed. A hybrid propulsion system and two gas systems that one is with gas engines. other with dual-fuel engines are compared with a diesel system. https://www.roneverhart.com/Jacksonville-Lever-with-Round-Rose-Omnia-943-00/