To put the figures in context, roughly 20% of the world population lives in 70 countries which possess “excellent conditions” for solar power – meaning long-term output exceeding 4.5 kWh/kWp per day. On a world region basis, only the countries in Africa average together above this threshold.
A lot of this solar energy potential in the less developed countries of Africa is still untapped, but as the source states, represents “a unique opportunity to provide affordable, reliable, and sustainable electricity services to a large share of humanity where improved economic opportunities and quality of life are the most needed.”