[mikorym]

Johannesburg has some strong motivators for solar energy (in whichever incarnation) such as:

1. Sunshine days

2. 2000m above sea level (for photovoltaic efficiency)

3. Many power interruptions and "load shedding" by state owned utility

4. Enough private (and government if they were better managed) money

5. Human capital and good universities

6. Enough physical space

I think there may be more reasons, but these are some of the main ones.