Food security worries are the perennial objection to large-scale solar projects, with critics claiming they gobble up farmland that might otherwise be used for agriculture. However, new work by Canadian researchers backs the growing consensus that the opposite is true: solar can boost harvests rather than hinder them.
A team led by Prof Joshua Pearce from Ontario’s Western University found that agrivoltaic systems – where crops grow beneath solar arrays – create a shady microclimate which shields plants from heatwaves, hail and other weather extremes. The setup also improves soil health and fuels nutrient recycling.
Interestingly, Pearce’s team found the microclimate is even more favourable when the panels are not in use, meaning even decommissioned solar farms could still provide a windfall for farmers.
Modelling suggests passive agri-cultural shading from unpowered panels could lift crop yields to the tune of $580bn (£435bn) worldwide.
“Decommissioned or unpowered arrays should not be dismissed as obsolete but rather reconsidered as durable agronomic assets,” wrote Pearce. “These systems can continue to support soil conservation, reduce crop heat stress and sustain livestock grazing even beyond their energy-producing lifespans.”
Main image: Lisa Miri
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