The sun's radiation is the largest available energy source on earth. Every day the earth receives more than 10'000 times of the world's daily energy consumption through the sun's radioation. Therefore, if only 0.01 % of this radiation would be transformed into electricity, 10% of the world energy consumption could be covered.

Swiss Radiation Map (Source: Meteotest)

Approximately 10% of the Swiss electricity consumption can be produced with today's PV technology by using an area of only 6 m2 per inhabitant. That surface is only a fraction of the roof areas existing today. The surface potential in the Swiss building stock is considerably higher.