It varies from country to country. If your grid is at the brink of collapse, it might be a challenge. Here in Germany, even changing all cars to electric would

It varies from country to country. If your grid is at the brink of collapse, it might be a challenge. Here in Germany, even changing all cars to electric would increase the total electricity consumption by less than 20%, not counting in the elektricity savings by no longer providing gasoline. This would probably doable by todays grid and the transition to electric cars will take 15 years even in the best circumstances, just by comparing the 45 million cars owned with the 3 million cars sold every year. Enough time to do adjustments to the grid where needed. One also needs to consider how much electric cars can be beneficial for the grid. With charging of parked cars remotely controlled, they can help with stabilizing the grid. An electric car in Germany uses about 8kWh/day - that is probably less that the AC unit now use in Greece. And if Greece doesn't have ample solar yet, it would be about time to change that urgently.