There are other forms of carbon-neutral electricity—hydroelectric, solar, wind, tidal, nuclear; you can even capture carbon emissions from natural gas plants if there was a hard requirement to. Since we have to solve that problem anyway it’s a separate problem.

Also, aluminum and bauxite can be shipped to/from where it makes the most sense to process it.

wrong, but it's worth finding out why that's an incorrect assumption on your own. Don't trust comments on the internet.