Its already starting to happen as people have more and more inverters and batteries. each time after load shedding, there is a big battery recharge spike.
Now yes the solar panel owners offset some of that in the day
ie only battery backup uses more
But panel owners even their normal usage is of the grid
We simply have no statistics to know
What i do know is eskom is producing less/less
ie generating capacity in mid 90's was 38000MW
Demand in 2023 april was
31000MW
Eskom generating capacity 2023 50 000MW
Rounded up
It doesn't take a rocket scientist
To figure out that we should not be having load shedding
Yet here we are
Lets not forget the actual villain