they use the "Azipod" propulsion system, which consists of industrial diesel-electric plants powering separate electric propulsion pods. Given solar deck tiles I suppose it could be used instead of diesel for commercial vessels.
The questions are, the economies of scale, and the quality of the goods being sold to the recreational marine market.
NewYouCleah plants, or whatever presidents from both parties seem to be calling them, are nothing new. Westinghouse's Reddy KiloWatt cartoon character promised us all grapefruit-sized nuclear plants powering our homes from safe economical plutonium balls all the way back in the 60's.
Puts a new spin on "Back to the Future", huh?