Scientists took measurements in fields of solar panels planted with pollinators.
After 4 years, results are in.
Native plants Up. Flowering plants Up. Total insects up 3X.
Native bees up 20X.
Agrivoltaics is the combination of solar energy production with agricultural and vegetation management practices. One type of agrivoltaics focuses on the establishment of habitat for insect pollinators and other wildlife that can provide important ecosystem services, such as pollination. Pairing solar energy facilities on previously disturbed lands with habitat enhancement sounds like a logical win-win strategy to address energy and biodiversity challenges. To date, however, there has been little field data available to document the feasibility and the ecological benefits of this novel land use approach.
The two studied solar sites were planted with native grasses and flowering plants in early 2018. From August 2018 through August 2022, the researchers conducted 358 observational surveys for flowering vegetation and insect communities. They evaluated changes in plant and insect abundance and diversity with each visit.
“The effort to obtain these data was considerable, returning to each site four times per summer to record pollinator counts,” said Heidi Hartmann, manager of the Land Resources and Energy Policy Program in Argonne’s Environmental Sciences division, and one of the study’s co-authors. “Over time we saw the numbers and types of flowering plants increase as the habitat matured. Measuring the corresponding positive impact for pollinators was very gratifying.”
By the end of the field campaign, the team observed increases for all habitat and biodiversity metrics. There was an increase in native plant species diversity and flower abundance. In addition, the team observed increases in the abundance and diversity of native insect pollinators and agriculturally beneficial insects, which included honeybees, native bees, wasps, hornets, hoverflies, other flies, moths, butterflies and beetles. Flowers and flowering plant species increased as well. Total insect abundance tripled, while native bees showed a 20-fold increase in numbers. The most numerous insect groups observed were beetles, flies and moths.
In an added benefit, the researchers found that pollinators from the solar sites also visited soybean flowers in adjacent crop fields, providing additional pollination services.
“This research highlights the relatively rapid insect community responses to habitat restoration at solar energy sites,” said Lee Walston, an Argonne landscape ecologist and environmental scientist who was lead author of the study. “It demonstrates that, if properly sited, habitat-friendly solar energy can be a feasible way to safeguard insect populations and can improve the pollination services in adjacent agricultural fields.” Walston also serves as head of the Ecology, Natural Resources, and Managed Systems department in Argonne’s Environmental Science division.
The research findings suggest two important implications of habitat-friendly solar energy. One is that habitat-friendly solar sites can play an important role in conserving biodiversity. Large amounts of ground-mounted solar is expected to be developed in the future, but if properly sited, habitat-friendly solar can offset the losses of natural areas to provide biodiversity benefits. Second, habitat-friendly solar sites can help mitigate land-use conflicts associated with the conversion of farmland for solar energy production. As approximately 80% of future ground-mounted solar development could occur on agricultural lands, the proper siting of habitat-friendly solar energy on marginal farmland can not only preserve prime farmland, but it could make prime farmland more productive through the pollination services provided by habitat-friendly solar energy.