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> Massive battery banks at the ports.

These kind of infrastructure is not something you can build in 3 year. You need more than one port having that.

Sure. Just like coaling stations and bunker fuel facilities didn't pop into existence with the snap of a finger either. Yet somehow they were built, eventually.

well, they started from smaller ships and grew in decades to the size they are now. Pretty sure we want faster timeline

Who is "we"? If this happens at all then it's going to take decades. There are severe constraints on the supply chain and skilled labor force.

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