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Wind power ferries. I think they tried that in the days before electrical motors.

:D

There's an article in a recent issue of IEEE Spectrum about a plug-in hybrid ferry:

It can cruise purely electric, although with just 100 kWh of battery capacity, the net result is a 30% reduction in diesel consumption.

There's a good video on a Denmark to Sweden ferry that is fully electric: https://www.youtube.com/watch?v=rE_M1n-ClOA