Here's a hypothetical: Do you think it would be feasible to create a plug that has a unique id such that an electric car could be charged remotely, but billed to the owner of the car rather than the person providing access to the power grid?
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).
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.