The total amount of solar energy incident on Earth is vastly in excess of the world’s current and anticipated energy requirements.
The potential solar energy that could be used by humans differs from the amount of solar energy present near the surface of the planet because factors such as geography, time variation, cloud cover, and the land available to humans limit the amount of solar energy that we can acquire. In 2021, Carbon Tracker Initiative estimated the land area needed to generate all our energy from solar alone was 450,000 km2- or about the same as the area of Sweden, or the area of Morocco, or the area of California (0.3% of the Earth’s total land area).