Ship capable of running selectively with liquefied fuel gas main drive engine and liquefied fuel gas generator engine

A ship comprising:

• at least one engine configured to selectively consume either or both fuel gas and fuel oil for generating power for propulsion of the ship;
• at least one generator configured to consume fuel gas for generating electricity;
• at least one motor configured to consume the electricity generated from the at least one generator for producing power for propulsion of the ship;
• a propulsion mechanism configured to propel the ship using the propulsion power from the at least one engine or the at least one motor;
• and
• a clutch system configured to connect or disconnect between the at least one engine and the propulsion mechanism and further configured to connect or disconnect between the at least one motor and the propulsion mechanism,
• wherein when the ship is operating in a first mode requiring propulsion power below a reference level, the clutch system is configured to connect the at least one motor to the propulsion mechanism and disconnect the at least one engine from the propulsion mechanism, in which the at least one engine does not contribute to propulsion of the ship and the propulsion power comes only from the at least one motor with consumption of only the fuel gas in the at least one generator,
• wherein when the ship is operating in a second mode requiring propulsion power above the reference level, the clutch system is configured to connect the at least one engine to the propulsion mechanism, in which the at least one engine contributes to propulsion of the ship with consumption of at least the fuel oil.