Figure 30.3. The little square strikes again. The 600 km by 600 km square in North America, completely
filled with concentrating solar power, would provide enough power to give 500 million
people the average American’s consumption of 250 kWh/d.
   This map also shows the square of size 600 km by 600 km in Africa, which we met earlier.
I’ve assumed a power density of 15 W/m2, as before.
   The area of one yellow square is a little bigger than the area of Arizona, and 16 times the
area of New Jersey. Within each big square is a smaller 145 km by 145 km square showing
the area required in the desert – one New Jersey – to supply 30 million people with 250 kWh
per day per person.