Growing crops on solar farms: Scientists model a win-win situation


April 10, 2014
Earth, Energy & Environment

A new model for solar farms that “co-locates” crops and solar panels could result in a harvest of valuable biofuel plants along with solar energy.

Growing agave and other carefully chosen plants amid photovoltaic panels could allow solar farms not only to collect sunlight for electricity but also to produce crops for biofuels, according to new computer models by Stanford scientists.

This co-location approach could prove especially useful in sunny, arid regions such as the southwestern United States where water is scarce, said Sujith Ravi, who is conducting postdoctoral research with professors David Lobell and Chris Field, both on faculty in environmental Earth system science and senior fellows at the Stanford Woods Institute for the Environment. “Co-located solar-biofuel systems could be a novel strategy for generating two forms of energy from uncultivable lands: electricity from solar infrastructure and easily transportable liquid fuel from biofuel cultivation,” said Ravi, the lead author of a new study published in a recent issue of the journal Environmental Science & Technology that details the idea.

Photovoltaic (PV) solar farms run on sunlight, but water is required to remove dust and dirt from the panels to ensure they operate at maximum efficiency. Water is also used to dampen the ground to prevent the buildup and spread of dust. Crops planted beneath the solar panels would capture the runoff water used for cleaning the PV panels, thus helping to optimize the land. The plants’ roots would also help anchor the soil and their foliage would help reduce the ability of wind to kick up dust.

Computer simulations of a hypothetical co-location solar farm in Southern California’s San Bernardino County by Ravi and colleagues suggest that these two factors together could lead to a reduction in the overall amount of water that solar farms need to operate. “It could be a win-win situation,” Ravi said. “Water is already limited in many areas and could be a major constraint in the future. This approach could allow us to produce energy and agriculture with the same water.”

But which crops to use? Many solar farms operate in sunny but arid regions that are inhospitable to most food crops. But there is one valuable plant that thrives at high temperatures and in poor soil: agave. Native to North and South America, the prickly plant can be used to produce liquid ethanol, a biofuel that can be mixed with gasoline or used to power ethanol vehicles. “Unlike corn or other grains, most of the agave plant can be converted to ethanol,” Ravi said.

The team plans to test the co-location approach around the world to determine the ideal plants to use and to gather realistic estimates for crop yield and economic incentives.

“Sujith’s work is a great example of how thinking beyond a single challenge like water or food or energy sometimes leads to creative solutions,” said Lobell, who is a coauthor on the new study. “Of course, creative solutions don’t always work in the real world, but this one at least seems worthy of much more exploration.”

This research was supported by the TomKat Center for Sustainable Energy at Stanford.



Growing crops on solar farms: Scientists model a win win situation

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2 Responses to Growing crops on solar farms: Scientists model a win-win situation

  1. Jesse Yuter (14043735) April 29, 2014 at 4:49 am #

    This idea is incredible in the sense that it reduces the natural resources that are scarce such as fresh water and benefits on resources such as the which there is an abundance of. It is environmentally friendly aswell and uses land that wouldn’t be used because of the conditions. It truly is a win-win situation! If the solar panels could be made to only be used for the farms but also as a renewable energy source, it will also reduce the effects of global warming and the use of non-renewable fossil fuels.
    To answer the previous comment on the cost… We have seen that to start up solar power is extremely expensive which is a disadvantages but the benefits in the future out way the disadvantages that come with it. It is an investment worth taking!

  2. u14010560 April 28, 2014 at 10:33 am #

    With usable water becoming scarce and the search for new fuels, this system seems like a promising option for the future. If this system is used and monitored properly it will help to reduce water waste and can form a new usable fuel. However, is the cost involved in building and maintaining the Photovoltaic solar farms not a major set back?

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