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Solar grazing

September 16, 2024 By EarthWise Leave a Comment

Agrivoltaics is the combination of solar power generation with agriculture.  Generally, this has involved growing crops under and around solar panels harvesting both food and electricity.  More recently, there has been increasing interest in grazing animals to manage lands used for solar power.

Enel North America, a large operator of solar farms and utility-scale battery storage facilities in Texas, has announced a partnership with Texas Solar Sheep Company to deploy more than 6,000 sheep to chow down on the greenery on eight large Texas solar sites.  This is the largest known solar grazing agreement executed in the United States

Texas Solar Sheep’s flocks will graze on more than 10,000 acres of land being used for solar generation, an area roughly ¾ the size of Manhattan.  Most of these sites are situated in areas with high rainfall and long growing seasons. 

The American Solar Grazing Association, an organization with 950 members across 45 states, facilitates research, provides education, and develops best practices in support of a unique population of shepherds and solar developers.  Their recent survey estimates that 100,000 acres of U.S. solar sites are currently being chewed on by sheep.  Texas has the most installed utility-scale solar power in the country.

According to Enel, its existing solar grazing program has demonstrated substantial improvements in soil health by the additional of organic matter to the soil.  Managing vegetation with sheep is also better for pollinators because sheep don’t cut down all plants the way mowing does.

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No more sheepless nights: Enel inks largest solar grazing contract

Photo, posted April 7, 2020, courtesy of Sean Nealon / Oregon State University via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Pollinator-friendly solar power

February 16, 2024 By EarthWise Leave a Comment

Global insect biodiversity has been in decline as a result of habitat loss, pesticide use, and climate change.  Restoring insect habitat is a way to reverse that trend.  Expanded use of solar energy is a critical part of mitigating climate change.  In order to meet the grid decarbonization goals the U.S. has set, approximately 10 million acres of land will be needed for large-scale solar development.  According to a new study by Argonne National Laboratory and the National Renewable Energy Laboratory, these two efforts are complementary.

Disturbed lands such as former agricultural fields are ideal locations to install solar panels.  These lands can also be established as excellent habitats for insect pollinators and other wildlife that provide important ecosystem services.

A five-year study looked at two solar sites in southern Minnesota that were built on retired agricultural land.  The sites were planted with native grasses and flowering plants in early 2018.  Over a five-year period, the researchers conducted hundreds of observational surveys for flowering vegetation and insect communities, evaluating changes in plant and insect abundance and diversity.

The team observed increases for all habitat and biodiversity metrics.  The total insect abundance tripled, while native bees showed a 20-fold increase in numbers. 

The research highlights the relatively rapid insect community responses to habitat restoration at solar energy sites.  If properly sited, the solar sites can offset the losses of natural areas created by solar farms and actually make prime farmland more productive through the pollination services provided by habitat-friendly solar energy.

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Insect populations flourish in the restored habitats of solar energy facilities

Photo, posted February 28, 2014, courtesy of Tom Koerner/USFWS via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

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