The World Bank's report "Solar Photovoltaic Power Potential by Country" shows that in most countries practical solar potential far exceeds current electricity demand.
About 93% of the global population lives in areas with average daily solar yields between 3.0 and 5.0 kWh per kWp. Around 70 countries, many in Africa, are classified as having excellent potential above 4.5 kWh/kWp.
In countries like Ethiopia and Mexico, the study estimates that as little as 0.005% to 0.1% of land area could meet total national electricity needs.