The diesel-electric plant of "Diamond Princess" has four diesel generators and a gas turbine generator. The diesel generators are Wärtsilä 46 series common rail engines, two straight 9-cylinder configuration (9L46), and two straight 8-cylinder configuration (8L46). The 8- and 9-cylinder engines can produce approximately and , respectively. These engines are fueled with heavy fuel oil (HFO or bunker c) and marine gas oil (MGO) depending on the local regulations regarding emissions, as MGO produces much lower emissions, but is much more expensive.