Grid-scale batteries are not the solution. Residential solar combined with residential storage either through dedicated batteries (which can be repurposed old EV battery packs or tailor-made residential storage batteries) or electric cars which can feed power back into the home can help more here by limiting peak consumption when people come home from work/school and - given large enough batteries - when they get up and prepare to go to work/school. In the more northern regions the effect will be limited in the winter months due to the limited amount of daylight, the opposite is true in the summer months.