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Isn't that in effect what happens at charging stations? Not a unique plug id, but public access "billed to the owner of the car".

Yup. This is done on mining vehicles already for (liquid) fuel security... a big issue in 3rd world countries. It's pretty easy tech.

yeh you could do it but what a hassle. Would require new meters at the premises, as well as each individual circuits for each charging station that you wanted to bill (otherwise there would be no way to separate out the usage).

IOW yes, but no.

Yes, absolutely, that wouldn't be difficult at all. A car's charging plug could have a chip such as is present in newer credit cards, and the transaction would be automatic.