But following on... The whole "but apartheid gov didn't give power to black people". Can't disagree, but just remember Eskom isn't just providing power to homes, it's actually mainly providing to industry. (Below is 2018) So yes you could double that residential block and it wouldn't move the pie hugely.
The whole Eskom didn't give power to black people under apartheid is not entirely true and is a point which ANC apologists love to throw about because it makes our current power issues appear to be apartheid's fault which is far from the truth.
In 1994 60.8% of the population had access to electricity and Eskom was already busy with a strong drive to get people connected regardless of skin colour while still under apartheid rule. That has since grown to around 85%.
Percentage of population connected to Eskom/municipalities:
So between 1994 and 2018/19 Eskom connected around 25% more of the total population.
We can thus assume that electricity generation requirements for residential areas would have increased by around 25%. It should be lower though as people have been switching to energy saving devices like LED/CFL instead of the old 60 and 100W light bulbs but lets leave that out of the argument for now.
If residential energy consumption increased by 25% in the past 20+ years then how does that explain that Eskom's energy availability factor is now less than it was under apartheid? The two are not even the same argument. Eskom is not able to generate as much electricity now than 20+ years ago so how is that apartheid's fault? Eskom was clearly doing better under apartheid than under the ANC.
Apartheid despite all it's wrongs clearly knew how to run SOEs efficiently. The ANC and connected cadres (Zuma, Koko, Guptas, patronage networks, etc.) caused this issue fair and square. Not apartheid.