The simple solution will be to implement bi directional charging and then use the family car to load balance the grid. Charge at night when power is cheapest and run the house off the car batteries if the price goes up because the grid is running low or just because you can. Not much more to say here. It is just like a computer cashing memory and disk space. Add a bit of solar to some of these homes and you dependence on the grid becomes minor. In this sophisticated tech world this concern was so nothing other than a business opportunity. 
With solar your own home becomes a type of hybrid house. Now who is not a fan of a good hybrid?  Out here in Kansas you can even buy houses with their own natural gas well. Imagine the possibilities.