An electric car in the Netherlands uses around 300 Watt on average over a year. That's not a lot. The grid challenges arise because people like to charge them fast. 11 kW in a residential street is a lot. And so is 150-400 kW at a fast charging station.
@Sustainable2050 Charging when parked overnight at a slow rate is no problem for the grid. But many cars are parked on the street (in space that should be available for cycling etc).