<p>Diesel electric propulsion is in many ways a good alternative to conventional shaft propulsion, both economically and environmentally. There are also many other good side effects which need to be considered, i.e. better manoeuvrability, more efficient use of space and less noise on board. However, there are applications where diesel electric propulsion is not profitable. Large ocean going ships’ profitability is much depending on fuel costs and the diesel electric alternative cannot compete on long journeys with large low speed engines.</p><p>This thesis will treat the aspects of choosing between a diesel electric system and a classic mechanical propulsion system. A compilation of facts and history in the subject will first be made. Then some different projects, where diesel electric propulsion has been chosen, will be gone through. At last conclusions of advantages and disadvantages with the different systems will be made and put together.</p>

Diesel electric propulsion is in many ways a good alternative to conventional shaft propulsion, both economically and environmentally. There are also many other good side effects which need to be considered, i.e. better manoeuvrability, more efficient use of space and less noise on board. However, there are applications where diesel electric propulsion is not profitable. Large ocean going ships’ profitability is much depending on fuel costs and the diesel electric alternative cannot compete on long journeys with large low speed engines. This thesis will treat the aspects of choosing between a diesel electric system and a classic mechanical propulsion system. A compilation of facts and history in the subject will first be made. Then some different projects, where diesel electric propulsion has been chosen, will be gone through. At last conclusions of advantages and disadvantages with the different systems will be made and put together.