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Excerpt from Purdue University: Our computer modeling at Purdue has revealed that for the most densely populated regions, using PV modules to collect solar energy as electricity there will not be enough rooftop and other conventional land areas available locally to supply the solar energy for most of the daily needs of the local inhabitants. This means more national and global interdependencies for energy and solar-energy-related products, just as with fossil fuels. The way out of this land constraint in a solar economy is to put the PV modules on farmland and cogenerate electricity alongside crops. The snag is that PV module installations cast deep shadows on the land underneath, depriving plants of sunshine and reducing yields by more than 20% in major food crops such as wheat, potato, soybeans, etc. This competition for land between food and energy is a deal-breaker for meeting local needs with local sunshine.

Purdue universityUnited statesDon villwockPu agronomy departmentNational science foundationPurdue agronomy centerIndiana agriculture coalition for renewable energyOpportunities to improve energyIndiana agriculture coalitionRenewable energySustainable foodWater systemsChemical engineerSunshine meets local needsGlobal impactKey is cogenerating electricity alongside farming