If we had solar power farms in the areas covered by the dark disks, these farms could provide more than the worlds 2006 total primary energy demand, and that only assuming a conversion efficiency of 8%. Thats ALL the energy consumed, including what we use from fossil fuels, could be supplied from solar cells.

The colors in the map show the local solar irradiance averaged over three years from 1991 to 1993 (24 hours a day) taking into account the cloud coverage available from weather satellites.