This webinar explored how solar panels shape growing conditions within utility-scale agrivoltaic systems and how vegetation responds when those conditions are combined with livestock grazing. Taylor Bacon shared early findings from a multi-year study in southwestern Georgia, highlighting how shade, precipitation redistribution, and soil moisture create distinct microclimates across the solar array.
The discussion also connected these research findings to the practical realities of solar operations. Tiffany Buck, Director of Sustainability with Arevon, offered an industry perspective on how field-based, multi-year data can inform vegetation management, construction practices, landowner conversations, and environmental claims.
What Is the Study Examining?
Taylor discussed a four-year, DOE-funded field study at a 140-megawatt solar array in southwestern Georgia examining how grazing and solar infrastructure affect vegetation, microclimate conditions, and soil health. The study compares sheep grazing, mowing, and an adjacent reference pasture while tracking conditions across four distinct microzones within the array.
What Microclimate Conditions Exist Within the Array?
Solar panels create distinct growing conditions by changing the amount of sunlight and precipitation reaching the ground. Taylor shared how these conditions vary between areas under the panels, between rows, and along the western and eastern drip edges. Soil moisture was consistently higher within the array than in the reference pasture, with the difference becoming especially pronounced during summer dry periods.
What Does the Vegetation Data Show After Two Growing Seasons?
After two growing seasons, above-ground biomass productivity did not differ significantly across the array’s microzones or between grazing and mowing treatments. Early changes in species composition, including an increase in cool-season species in some shaded areas, suggest that longer-term monitoring will be important for understanding how vegetation communities respond to these conditions.
What Do Preliminary Soil Findings Indicate?
Initial soil sampling found no measurable loss of soil carbon compared with a matched reference site three years after construction. However, soils within the array had higher bulk density, likely reflecting compaction from construction equipment. The findings highlight the importance of construction practices, including minimizing grading and heavy equipment traffic, in supporting long-term soil health.
What Are the Key Takeaways for Developers and Operators?
The early findings indicate that productive grazing can coexist with utility-scale solar in the humid subtropical Southeast, while also underscoring the importance of site-specific management. The speakers discussed how construction practices, vegetation management, stocking strategies, and monitoring can influence both operational outcomes and long-term site conditions.
Why Does This Research Matter to the Solar Industry?
Tiffany connected the research to broader industry needs, including setting realistic expectations for vegetation management, communicating with landowners, and supporting environmental claims with measurable data. Multi-year, operationally grounded research can help developers and operators better understand outcomes at solar sites and communicate those outcomes more credibly.