I’m really sceptic about that kind of metrics because many of them take carbon offsets into account, and carbon offsets are mostly greenwashing.
Power mix in the world right now is over 50% coal and gas, and only hydro is over a 10%. This is worldwide, so mix varies depending on where you are.
In the end EVs are no making a dent in power demand. They are increasing it. The percentage of fossil fuels is maybe going down but total fossil fuel consumption is increasing as our demand does. Green energy is only taking some of the slack from the increase.
EVs will be remembered as the thing we did to keep using cars and feeling good about it.