How Solar Panels in the Sahara Could Make It Rain More

Renewable energy installations like wind turbines and solar farms are usually tasked with preventing changes to the environment, but according to new research they may cause some environmental change of their own. According to a study published in the journal Science, building wind and solar farms in the Sahara desert can increase rainfall and make more plants grow.

Governments and energy providers around the world are increasingly turning to wind and solar power to generate electricity and to replace climate change-causing fossil fuels. But one group of researchers wondered how these power sources would affect the environment as they become more common. After all, filling the sky with turbine blades and covering the ground with solar panels is likely to changing things—at least a little bit.

To test the idea, the team used the Sahara desert as a testbed as its been the site of large renewable plants in the past. For this study the authors looked at what the desert would look like if it was covered substantially with wind turbines and solar panels. The researchers simulated the effects of around 79 terawatts of solar panels and 3 terawatts of wind turbines.

To put that number in perspective, the total amount of solar power added by all the world’s nations in 2017 was slightly less than a tenth of a terawatt, so this research isn’t immediately relevant for today’s renewable installations. But it’s a number not completely unconceivable in the far future.