[harmalarm]

What if we already have fusion power at sea? Water has one of the highest heat capacities of any substance in the world, and Earth is covered in it. The sun provides all the fusion energy we need while our oceans absorb and store it. What if we simply extract the stored fusion power from the ocean? Ocean Thermal

[DennisP]

To extract thermal energy you need a temperature difference. The way to do it for ocean thermal is with OTEC, which pumps cold water from deep down up to a large heat exchanger at the surface. It's usable for stationary power but I don't think it'd work for a ship, it's bulky and would add a lot of drag. Plus it mainly works in tropical regions.