The Wikipedia page says the engines are this kind and only produce 9MW: http://www.mtu-online.com/mtu/products/engine-program/diesel-engines-and-gas-turbines-fo

The Wikipedia page says the engines are this kind and only produce 9MW: http://www.mtu-online.com/mtu/products/engine-program/diesel-engines-and-gas-turbines-for-marine-main-propulsion-dieselelectric-drives-and-onboard-power-generation/diesel-engines-for-yachts/detail/product/472/cHash/4ff3806e0fd02da8b2018163b14381d1/ http://www.mtu-online.com/mtu/products/engine-program/diesel... But I see what you are saying, that seems like plenty, I had always assume that it would take a huge amount of energy (I know pretty much nothing about electricity).