Once, I heard about that the Sun releases 1,7x10^17 J per year and our most advanced solar cell can take out 43% of the energy that came form the Sun.
So if we put many solar cells in Africa, specifically in the Saara Desert, that has 9 200 000 km^2 we could produce enough energy to power all Africa.
But even if we just put the solar cells on top of the houses, they could still have enough power to live without power that comes from a generator that runs with oil or some kind of fuel and stops working when they need.
Some kids would be able to study at night and have better grades, consequently have better lives.