My point is that 15% is still 15% even it represents the population of Estonia or of a suburb of NY.

By the way you are mixing everything. I talk about private transport and you give me the figure for total energy consumption... Total energy consumption is not going to increase!!! The petrol burnt in an engine is already counted. Because of all the loss due to the pathetic yield of IEC engines, your are not going to increase the total energy consumption but decrease it when you will electrify transport.

For Switzerland electrification of all private transport represent the addition of 2 nuclear reactors, so no nothing to write home about regarding sizing of the grid.