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World's first 10,800 car carrier with solar power delivered by China
(interestingengineering.com)
This is a most excellent place for technology news and articles.
I saw a story about a similar car carrier with solar panels, basically they're used to offset the hotel load of the ship, and have nothing to do with the propulsion.
Which is still a significant improvement considering how much time a vessel like this spends at port loading and unloading.