5. Conclusion

The mechanical-electrical distinction for ship propulsion-energy systems is gradually disappearing.

Between purely mechanical propulsion systems, with no link to electrical power generation, and all-electric systems, in which a single power plant supplies all the ship's needs, new integrated hybrid mechanical-electrical systems have found their place.

For these new systems, the power ratio between mechanical and electrical power is determined by ship type and operating schedule, with virtually any ratio possible.

In parallel with all-electric ships, the role of hybrids will continue to grow, driven by the need to optimize energy consumption and reduce pollutant emissions, which in turn requires the use of electric power to exploit all energy recovery and battery storage possibilities.