Magenta solar panels may be agrivoltaics' cleverest trick yet

Agrivoltaics combines crop production and solar power on the same land, but conventional opaque panels can cut yields by blocking sunlight. A study in Cell Reports Physical Science tested semi-transparent cadmium-telluride panels designed to capture some wavelengths for electricity while letting through red and some blue light used by plants. The panels cast a magenta shade over broccoli grown at a farm in Sweden. The approach could help reduce competition for land: estimates cited suggest that using just one percent of U.S. farmland for agrivoltaics could meet as much as 20 percent of national electricity demand.

Broccoli beneath the panels grew more slowly, taking 25 extra days to reach harvest, but its yield was roughly unchanged. The shade also lowered vapor pressure deficit, a measure related to plants’ water stress and their need to limit photosynthesis. Researchers suggest this improved growing conditions and helped raise biomass produced per unit of sunlight by 2.8 to 4.5 times compared with unshaded plants. Macronutrient levels were similar or higher, though some micronutrients, including iron, copper, and zinc, were slightly lower. The results are promising but preliminary: larger trials across seasons, locations, and climates are needed to establish whether the panels work reliably at farm scale.