[reitzensteinm]

That's bad math. If you add EVs to a grid that's in the process of decarbonizing, the marginal impact is all that extra power comes from whatever would be shut down next.

EVs are still worth it if they're powered by coal or natural gas. But quoting them as getting cleaner as the grid decarbonizes is wrong, until the existing load is satisfied with renewables (even instantaneously).

The only exception is if EVs allow you to increase the renewable share beyond what you'd otherwise be able to do eg with demand dispatch.