This is why this isn't the plan. Instead there will be some amount of over capacity at abundant times such as summer for solar which means power will be very ch

This is why this isn't the plan. Instead there will be some amount of over capacity at abundant times such as summer for solar which means power will be very cheap or free during some months of the year and batteries will simply be used to match power usage through the day and across a few days. If batteries were very much cheaper than having just enough power across the year would be the right strategy but we don't so it's not and in a lot of countries the overproduction is only +50% and the much cheaper option.