Replying to
@jwildeboer afaik this is already happening in various places, for example on california, where they hooked up user's batteries to the grid (includong EV's), and the utility was able to pull into the grid at peak time to avoid blackouts. They also changed building code to require all new construction to have solar panels. The EU otoh is very behing on both central and distributed battery. And I see no mandates to install solar in the southern states where a crapton of energy could be made.