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Multi-year analysis of physical interactions between solar PV arrays and underlying soil-plant complex in vegetated utility-scale systems

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  • Choi, Chong Seok
  • Macknick, Jordan
  • McCall, James
  • Bertel, Rebecca
  • Ravi, Sujith

Abstract

Concerns over the land use changes impacts of solar photovoltaic (PV) development are increasing as PV energy development expands. Co-locating utility-scale solar energy with vegetation may maintain or rehabilitate the land's ability to provide ecosystem services. Previous studies have shown that vegetation under and around the panels may improve the performance of the co-located PV and that PV may create a favorable environment for the growth of vegetation. While there have been some pilot-scale experiments, the existence and magnitude of these benefits of vegetation has not been confirmed in a utility-scale PV facility over multiple years. In this study we use power output data coupled with microclimatic measurements in temperate climates to assess these potential benefits. This study combines multi-year microclimatic measurements to analyze the physical interactions between PV arrays and the underlying soil-vegetation system in three utility-scale PV facilities in Minnesota, USA. No significant cooling of PV panels or increased power production was observed in PV arrays with underlying vegetation. Fine soil particle fraction was the highest in soils within PV arrays with the vegetation which was attributable to the lowest wind speeds from the compounding suppression of wind by vegetation and PV arrays. Soil moisture and soil nutrient response to re-vegetation varied between PV facilities, which could be attributed to differing soil texture. No statistically significant vegetation-driven panel cooling was observed in this climate. This finding prompts a need for site-specific studies to identify contributing factors for environmental co-benefits in co-located systems.

Suggested Citation

  • Choi, Chong Seok & Macknick, Jordan & McCall, James & Bertel, Rebecca & Ravi, Sujith, 2024. "Multi-year analysis of physical interactions between solar PV arrays and underlying soil-plant complex in vegetated utility-scale systems," Applied Energy, Elsevier, vol. 365(C).
    • Handle: RePEc:eee:appene:v:365:y:2024:i:c:s030626192400610x
    DOI: 10.1016/j.apenergy.2024.123227
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    References listed on IDEAS

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    1. Dupraz, C. & Marrou, H. & Talbot, G. & Dufour, L. & Nogier, A. & Ferard, Y., 2011. "Combining solar photovoltaic panels and food crops for optimising land use: Towards new agrivoltaic schemes," Renewable Energy, Elsevier, vol. 36(10), pages 2725-2732.
    2. Beckman, Jayson & Xiarchos, Irene M., 2013. "Why are Californian farmers adopting more (and larger) renewable energy operations?," Renewable Energy, Elsevier, vol. 55(C), pages 322-330.
    3. Walston, Leroy J. & Li, Yudi & Hartmann, Heidi M. & Macknick, Jordan & Hanson, Aaron & Nootenboom, Chris & Lonsdorf, Eric & Hellmann, Jessica, 2021. "Modeling the ecosystem services of native vegetation management practices at solar energy facilities in the Midwestern United States," Ecosystem Services, Elsevier, vol. 47(C).
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