Then separate the infrastructure fee, my family switched to solar and has since paid $0 on usage, but still pays electricity bill in form of the minimum cost to maintain infrastructure.

Also with a big grid, there's will be enough industry consuming large amount of power during daylight hours for a long time, that's why with variable power rates power is still more expensive during daylight hours, you don't have to worry about the generation outstripping load for a long time, and if we hit that it would be a good news as we can all focus on storing power and phase out fossil fuels.