Does that include the cost of either coming in to base to refuel or maintaining and using ships to carry fuel in that have to go back to base to refuel? Or the strategic advantages of not having to refuel just certain ships like submarines at known ports? Because they don't have to do that for the whole fleet.
OTOH we could be green and go back to sails. ;^) Not for all the ships, just the real big ones, LOL!
The scientist holding up the beaker of water and saying this could run a city for a year or something like is an old stock cold fusion scifi line. I just forget how much it's based on numbers.
I saw a thing where Russian scientists had found at Chernobyl that some of the lead shielding had been turned to gold through radiation exposure. Not much I suppose and from what they said the gold was strongly radioactive.