- Dark solar panels turn desert heat into rain clouds, not just electricity
- A 20 square kilometer solar farm produces more rain than a year of cloud seeding
- The humid winds of the Persian Gulf are what the desert sun needs to bring rain
In the United Arab Emirates, where water is more valuable than oil, new research suggests that large solar farms could trigger their own downpours.
A modeling study led by climate scientist Oliver Branch at the University of Hohenheim found that dark solar panels absorb more heat than the surrounding reflective desert sand.
This temperature difference drives updrafts that can lead to rain, potentially providing water for tens of thousands of people.
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How dark solar panels create their own weather
The researchers modeled solar panels as nearly black surfaces that absorb 95% of incoming sunlight.
When solar farms exceeded 15 square kilometers, the increased heat contrasted sharply with the reflective sand around them, increasing the upwelling that drives cloud formation, but it needs a source of atmospheric moisture.
However, the model showed that moist, high-altitude winds from the Persian Gulf would be sufficient.
A 20 square kilometer solar field would increase rainfall by almost 600,000 cubic meters under the right conditions, equivalent to 1 cm of rain falling over an area the size of Manhattan.
If such rain showers occurred ten times in one summer, they would provide enough water for more than 30,000 people for a year.
“Some solar farms are coming up to the right size right now… Maybe it’s not science fiction that we can produce this effect,” Branch said.
One limitation is that the simulated solar panels were darker than most manufacturers currently do, as some modern solar panels are designed to be reflective to cool their surroundings, which would reduce the accounting effect.
Zhengyao Lu, a climate scientist at Lund University, called the new work “very stimulating” but noted this concern.
Branch is hopeful that the idea can be tested in the real world, noting that solar farms coming online in China are nearly large enough.
He suggests planting dark, drought-tolerant crops such as jojoba bushes between rows of panels to enhance the effect.
The United Arab Emirates funded Branch’s modeling research, but the country remains committed to its cloud seeding program, conducting approximately 300 missions each year.
This implies that local authorities are not yet convinced that solar-induced precipitation is a practical alternative.
According to Branch and his team, this model could work in other arid regions, including Namibia and Mexico’s Baja Peninsula.
If future research validates these findings, the lucrative potential of solar farms could provide an unexpected incentive to expand renewable energy in the world’s driest regions.
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