Global warming is an aspect that is increasingly concerning today's society and by which various projects and studies are being developed.The naval sector is not going to be less; it is more and more frequent to see boats with some elements that produces energy in a sustainable manner. The aim of this project is to redesign a power system of a 20 meters length yacht in order to minimize the diesel oil consumption. The yacht proposed for this analysis is the Nomad 65 made by the company Gulft Craft. Subsequent to this, the use of solar panels and wind turbine has been studied. In all the project it has been taken to account the yacht have to be enjoyable and elaborated with luxurious details. In this research, it has been proofed than nowadays is still not possible to have a yacht of this peculiarities that only works with renewable energies. Solar panels and wind turbine generate too little power to operate the yacht. Moreover, there is a limited space to instal this elements without modifying outdoor areas. In order to make the yacht serviceable it has been decided to allow the charge of batteries through a plug in harbor and to instal a diesel generator on board. The technology is still not enough to minimize considerable the amount of diesel oil consumption in a yacht.