for sailing yachts that makes sense. They would use wind for most movement. While in harbor though they want the finer control that being under power allows - they don't need high speed/high power then though. They also don't spend a lot of time in this situation.
replyElectric tugs are now a thing to do similar for big ships.
replyA step before that is to have shore power to run things when in port.
In general stopping pollution near populated areas and busy ports is a bigger win and so a good place to start.
I think sailing uses mainly some other kind of energy source.
replyRight. And sailing container ships seem to also be coming back into vogue.
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