BKS argues that you cannot take solar panels on the roof of the battery factory into your calculations since "otherwise you just take away green electricity elsewhere". My point is that if you allow that reasoning (which I think is correct) then it also follows that using dirty electricity in the EU takes away dirty electricity elsewhere. Therefore, the calculated emission impact of electricity use should probably be much closer to zero.

And since diesel use in transportation is not included in ETS, there is an even bigger impact of switching from diesel to EV: you stop burning fossil fuel in your car and the electricity you use will crowd out emissions elsewhere.