First, you are only talking about generation component. 17% may not seem like much until you consider that 1. it is roughly half of existing nuclear generation, which is already decided to be phased out 2. some nuclear reactors provide heating 3. that "only" 17% is equal to total consumption of one Baltic state.

That is for Switzerland alone, which is measly small compared to EEA population. For the sake of argument round that 17% to be 10 TWh. Switzerland owns roughly 6 mio private vehicles. EEA owns roughly 250 mio. According to referenced study EEA needs "only" roughly 400 TWh additional generation, or something like 60 nuclear reactors.

You just proved my point with data - it is shitloads of additional energy.

Second, that additional energy will have to be moved somehow. You not only need ample generation, but also cross-region links, transmission grids and distribution lines to actual homes/chargers.