She is powered by a Wärtsilä-Sulzer 14RTFLEX96-C engine, the world's largest single diesel unit, weighing 2,300 tonnes and capable of 81 MW (109,000 hp) when burning 14,000 litres (3,600 US gal) of heavy fuel oil per hour. At economical speed, fuel consumption is 0. 260 bs/hp·hour (1,660 gal/hour). She has features to lower environmental damage, including exhaust heat recovery and cogeneration. Some of the exhaust gases are returned to the engine to improve economy and lower emissions, and some are passed through a steam generator which then powers a Peter Brotherhood steam turbine and electrical generators. This creates an electrical output of 8. 5 MW, equivalent to about 12% of the main engine power output. Some of this steam is used directly as shipboard heat. Five diesel generators together produce 20. 8 MW, giving a total electric output of 29 MW. Two 9 MW electric motors augment the power on the 150 meter main propeller shaft, the longest in the world.