There is no need to worry. The Dream and the Fantasy ships are Diesel Electric. In others words they have diesel engines that drive electric generators that #1 run the electric motor that moves the ship and #2 supplies electrical power through out the rest of the ship. The ship, if I am remembering correctly has 7 of the diesel electric generators and they only need 3 for normal ships operation. 1 is for drive, 1 is for electrical power, and 1 is for AC and water. They are able to use any of the 7 for what ever purpose the need.