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Largest Farm to Grow Crops Under Solar Panels Proves To Be A Bumper Crop For Agrivoltaic Land Use
(site.extension.uga.edu)
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It's usually permanent pasture grazing that's mixed with solar panels. Take low value land that doesn't support the use of large equipment, add value with panels and get free shade for livestock.
Another technique is covering canals with solar panels, with both advantages in terms of lower evaporation and higher efficiency due to the cooling effect of water on panels.