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.nacrack.com/hot-savings-Almond-White-Rib-Knit-Set-p8926-mega-pick/