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The first passenger ferry to use a gas turbine was the GTS Finnjet, built in 1977 and powered by two Pratt & Whitney FT 4C-1 DLF turbines, generating 55 MW and propelling the ship to a speed of 31 knots.
However, the Finnjet also illustrated the shortcomings of gas turbine propulsion in commercial craft, as high fuel prices made operating her unprofitable.
After four years of service additional diesel engines were installed on the ship to reduce running costs during the off-season.
The Finnjet was also the first ship with a CODLAG propulsion.
Another example of commercial usage of gas turbines in a passenger ship is Stena Line's HSS class fastcraft ferries.
HSS 1500-class Stena Explorer, Stena Voyager and Stena Discovery vessels use COGAG setups of twin GE LM2500 plus GE LM1600 power for a total of 68 MW.
The slightly smaller HSS 900-class Stena Charisma, uses twin ABB – STAL GT35 turbines rated at 34, 000 kW gross.
The Stena Discovery was withdrawn from service in 2007, another victim of too high fuel costs.

1.873 seconds.