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25%.
Co-generation means they are using the exhaust heat from a gas turbine to generate steam for a steam turbine.
In the Titanic they used a combination of steam turbines and triple or quadruple expansion piston engines, because the piston engines were more efficient.
The first all big gun Battleship, Dreadnought (1906), had oil fired steam turbines. Not because they were more efficient, because they could obtain higher sustained speeds and the vibration from a 20 ton piston in a giant reciprocating steam engine was substantial.
regards
Mech
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