AJ, I don't even know where to start with this, there are so many problems with this plan:
1. Let's assume that residential is taken care of by home solar & batteries. How many days battery backup? This is crucial. If a home is going to be 100% independent this means they need about 7 days worth of battery backup which will cost a fortune. Even if there is a big drop in battery prices this will be 2 or 3 times more costly than current electricity prices. When you see competitive PV Solar costs, this is generally without batteries or with just a few hours backup. But you can't run a country this way. If there is a huge cold front you can easily have cloud for many days (just ask anyone who like me lives off-grid on solar).
2. Municipalities currently buy electricity from Eskom at 70c/unit and sell it to the consumer at about R1.30/unit. This is the primary source of funding for municipal services. If homes will now generate their own energy, municipalities will have to levy large taxes.