At a very conservative (for solar) 20% growth rate this means that, by 2030, solar will have added 200TWh capacity to the combined African grid and will be adding 1/5 of Africa's current coal generation capacity annually. Even without much storage (which there will be) this will make a massive difference to African homes and businesses.
All the other clean options will still be getting out of the gate by then.
This is the _start_ of the growth story not the end.