Led by calls to reduce emissions (CO2, NOx, PM-values), while at the same time increasing energy efficiency with a long-term eye on the diminishing supply of fossil fuels, it is clear for all that “alternatives” — even under the aspect of higher investment costs — will pay back in the future. Beside economic and safety-related aspects, more and more questions about environmental protection as well as health hazards due to the emission of harmful substances into the environment play an essential role in shipbuilding.