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@goatsarah @cstross @Nicovel0 @danjac

It's not about the scale, but about the usage: long-distance shipping works v differently to smaller craft on shorter trips because they need constant power output for days or weeks. That means a hybrid system is mostly pointless (unlike eg ferries, which maneouvre a lot).

Personally I suspect that this will be all the things mentioned in thread - slow steaming, wind assist, maybe PV, plus also renewables-based liquid fuel.