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	The principal advantages of this system are:

	- lower and easier maintenance
	- gain of volume and weight considerable (about 900 tons and 50 pax cabins + 20 crew's cabins have been added).
	- lower noise and vibrations level, so better comfort and lower probability of failure for several equipments

	Electric power, for propulsion and other needs of the board, is produced by combined cycle (COGES type): gas turbines and steam turbines. The two main alternators (25 MW, 3,600 tr/min) are driven by two gas turbines type LM2500+ built by General Electric. Each gas turbine is equipped with a recuperative boiler (recuperation of the heat issuing of the combustion of gas in the turbine) which produces the necessary steam to drive a steam turbine (one for the 2 gas turbines) used to drive 9MW alternator.

	The thermic output is then 43% instead of 39% with gas turbine only. The previous version of this gas turbine model, the General Electric LM2500 is available for a long time onboard US Navy ships and other Navies (the LM2500+ has a higher power of 25%). Probably higher TIT => exhaust temperature increase => steam generation possible.

	They are very reliable turbines, only one serious breakdown for 48,800 hours functioning according statistics.
	For Celebrity, these 48,800 hours would represent 10 years of commercial exploitation of the MILLENNIUM.
	More, in case of failure, a gas turbine could be able to be replaced in 8 hours only. (a spare one is stored onboard).

	Here, it's interesting to notice, gas turbines are (at this time) only interesting in high speed vessels (like warships or quite fast passenger ships - max speed of 25kts and service speed of 24 kts for MILLENNIUM). This is due to higher price of gasoil instead of fuel for diesel engines and better output of diesels at lower power.

	The Fastship Lines are building container ships using gas turbines. Max speed 40 kts. Five Trents => 250 MW power.

	A factor of 1000 less need for lubrication's oil than corresponding diesel engine requirement.

	An electric generator or dynamo for producing alternating currents
	An old term for an electric generator that produces alternating current (especially in automobiles)
	The Millenium does not have primary boiler(s)/steam turbine(s) system but only primary gas turbine system and THEN, the heat issued of the combustion of gasoil in the two gas turbines is recuperated to heat a boiler which produces steam for a third smaller steam turbine. This steam turbine is only here to improve the output.

	Source does not claim use of steam for ”hotel-service”. I think this is something that was forgotten.