If evening peak loads become an issue then power companies can incentivise people to use less by raising the price at peak, and/or lowering it at off-peak times

If evening peak loads become an issue then power companies can incentivise people to use less by raising the price at peak, and/or lowering it at off-peak times. And the software in the car can schedule charging to take advantage of cheaper prices. For example, you might plug in at 6pm, but the car will know to not start the charge until after 10pm, for example, or whenever power becomes cheaper.