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What is producing the electricity? If it's clean energy, maybe. It shouldn't be "thinking about those," but rather trying to compare similar load to energy cost per person. If the underground, rail, etc can't beat something that has to push through water that doesn't really make sense.
That question can be applied to all the electric forms of transportation of the chart though.
But if we assume it's the about the same energy mix as for the tube or trams, then it isn't that surprising. Volecity is major factor in the drag equation and ferries move very slow but have high capacity, so even with the additional drag, moving on cables should be closer to rail efficency than to a ship which has to use propellers.
It's still odd that it's below those other two, but I would have assumed they are in the same ballpark.