Robots brush the dust off of desert solar panels every night without a drop of water, saving about 2.6 billion gallons so far

https://www.ecoticias.com/en/robots-built-by-the-israeli-company-ecoppia-roll-along-desert-solar-panels-every-night-and-brush-off-the-dust-without-a-drop-of-water-saving-about-2-6-billion-gallons-so-far-according-to-the-company/37450/