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URL:  http://boards.fool.com/cruise-ships-have-4-or-5-giant-engines-two-of-30547250.aspx

Subject:  Re: Cruise Ship Date:  2/17/2013  1:39 PM
Author:  FlyingDiver Number:  18237 of 19021

Cruise ships have 4 or 5 giant engines. Two of them run giant big generators...those ships generate enough power for a good small size town of 10,000 people.....and need loads of power for giant freezers, air conditioning for 2000 rooms plus lots of public space, water and sewer systems, etc..

Actually, I think on the more recent ships, all the diesel engines run generators, and the actual propulsion units are all electric. Like diesel-electric locomotives.

http://en.wikipedia.org/wiki/Carnival_Triumph:

Like most modern cruise ships, Carnival Triumph has a diesel-electric propulsion system in which the main generators provide electricity for all shipboard consumers from propulsion motors to hotel systems such as air conditioning and lighting. Her power plant consists of six diesel generating sets, four 16-cylinder Wärtsilä-Sulzer 16ZAV40S and two 12-cylinder 12ZAV40S medium-speed diesel engines. Her two 17.6-megawatt electric propulsion motors and controllable pitch propellers give the ship a maximum speed of 22.5 knots and a service speed of about 20 knots. For maneuvering at ports, Carnival Triumph has six transverse thrusters.
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