As agrivoltaics gain traction across the United States, research on barriers and opportunities for co-locating agriculture with solar is expanding. The SCAPES solar research project, led by the University of Illinois Urbana-Champaign, has received funding from the U.S. Department of Agriculture to study how to efficiently co-locate photovoltaic and agricultural systems in various biogeographical regions. As part of this research, the project team created a survey to better understand the strengths, weaknesses, opportunities, and threats of such co-location.
Your voice matters! Please take 15 minutes to complete this survey. Your participation is greatly appreciated and will contribute to the success of our research. Your insights can impact future agrivoltaic considerations. We encourage all industry representatives to participate.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2023/12/5-scaled.jpg19202560A. J. Pucketthttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngA. J. Puckett2024-11-12 16:29:442024-11-12 16:29:45SCAPES Agrivoltaics Survey
“Growing Farmers, Growing Foods” is the mission at Minnesota-based Big River Farms, a program of 501(c)3 nonprofit The Food Group. They recently won the North American Agrivoltaics Award for Best Solar Farm in 2024. Big River Farms teaches farmers to farm organically, sustainably, and regeneratively while also enhancing the level of understanding of the environmental impact that can result from properly implementing these types of farming practices. Specialty crop farmers are the backbone of our food system and are major contributors to local economies. However, land access is a major barrier for many emerging farmers, including farmers of color, in both rural and urban communities.
Big River Farms Program Manager KaZoua Berry. Photo: AgriSolar Clearinghouse
In 2022, the Minnesota Department of Agriculture established the nation’s first Emerging Farmers Office, with the intention of helping to remove barriers that emerging farmers face when getting started in farming. This includes new Americans and first-generation farmers who lack access to land or capital. Farmland access has been identified by the Emerging Farmers Office as the most common challenge for these farmers.
Big River Farms works with farmers who are in constant need of land to farm on. Last year in Big River Farms’ incubator program, several farmers stated that they are ready to leave the incubator farm if they can buy land or access land elsewhere so that they can scale up independently. Expanding their program to solar sites will enable Big River Farms to build leadership and capacity in the immigrant community, diversify and enhance local food production, improve access for low-income households to healthy food, and build cultural bridges between emerging farmers and the larger community.
Big River Farms, the Food Group, USDA Emerging Farmers Office, and Connexus Energy. Photo: AgriSolar Clearinghouse
“With thoughtful planning and procurement, the community benefits of multi-acre solar projects can be numerous,” said Brian Ross, vice president of Renewable Energy for Great Plains Institute. “It’s important that we are stacking solutions to local food production and access into the clean energy transition.”
With this project, the visibility of the dual-use solar will create new connections to the host communities for the solar arrays and build Big River Farms’ success and enhance its mission. Association of the solar facilities with the Big River Farms’ equity goals will help resolve concerns about loss of agricultural capacity in communities hosting solar development and can contribute to accelerated deployment of solar sites on arable soils.
“A quarter of an acre between rows can become an incredibly productive plot of land that right now isn’t necessarily in use,” said Sophia Lenarz-Coy, executive director of The Food Group.
Abundant Crops Grown by Big River Farms Between Rows of Solar Panels. Photo: AgriSolar Clearinghouse
The Solar Farmland Access for Emerging Farmers project seeks to increase land access to BIPOC and immigrant farmers through the utilization of spaces around solar farms, while concurrently documenting the safe and scalable practices that solar asset owners and insurers can implement as prerequisites of site utilization. Big River Farms, Great Plains Institute, US Solar, and Connexus have worked together to implement best practices from the National Renewable Energy Lab that have created replicable guidance for others seeking to collaborate and enable solar facility access for farming activities.
Winners of the North American Agrivoltaics Award for Best Solar Farm in 2024: The Food Group, Big River Farms, US Solar, NREL, Great Plains Institute, and Connexus Energy. Photo: AgriSolar Clearinghouse
Community opposition to multi-acre solar development is driven in part by communities misunderstanding the local benefits of agrivoltaics and thinking that farmland is being taken out of production. Developing solar does not mean farmland is being destroyed or taken out of production. LBNL’s recent research and NREL’s latest publications from the InSPIRE study show that utilities and solar developers need to maintain and improve what is known as “solar’s social license” in communities nationwide. To avoid the worst effects of climate change, more than 3 million additional acres of solar arrays need to be built by 2030.
While incorporating agriculture into solar designs has been shown to increase public acceptance of solar, some approaches are looking at elevating solar panels 10 feet to grow commodity corn and continue status-quo farming approaches. However, hand-harvested crops commonly sold in farmers markets nationwide can readily be grown in abundance with existing solar facility designs, such as one or two panels on single-axis trackers and torque-tube height of six feet.
Big River Farms Tomato Crop at US Solar Big Lake Array. Photo: AgriSolar Clearinghouse
Through the Big River Farms program, farmers learn to scale up their food production while implementing sustainable and regenerative farming practices that improve water quality and usage. Having land access to get started as a specialty crop farmer fills a critical niche in helping address the larger challenges related to land ownership and sustainable, specialty farm operations. Building skills, network, and resources, especially in the agrivoltaics community, helps prepare specialty crop farmers for the next stages of their success.
Moving Forward: Growing Farmers, Growing Crops
Moving forward, Big River Farms and Great Plains Institute have been identifying barriers, challenges, and successes of utilizing solar spaces and gathering feedback from farmers, utilities, solar facility owners, and host communities. This project will build capacity and enhance the possibility of success for emerging farmers among immigrant and BIPOC farmers. It will also diversify local agricultural and food-production markets. Most importantly, it will help enhance the communities’ understanding of agrivoltaics systems and diminish the misunderstood concept that solar is taking over valuable agricultural lands.
With these concepts and practices in place, it will help the organization achieve and sustain the mission of “Growing Farmers, Growing Foods.”Through education, the emerging farmers will succeed and prosper, and through sustainable and regenerative agrivoltaics farming practices, the foods will grow as well.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2024/10/image-1.jpeg10731430A. J. Pucketthttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngA. J. Puckett2024-10-09 11:55:412024-11-04 08:32:07Case Study: Existing Solar as Farmland Access for Emerging Farmers
Leroy J. Walston, Heidi Hartmann, Laura Fox, Michael Ricketts, Ben Campbell, and Indraneel Bhandari, Argonne National Laboratory
This section highlights several types of agrivoltaic options related to ecosystem services that include siting considerations, ecological impacts of dual-use sites, construction methods and habitat restoration strategies. One type focuses on ecologically focused siting, construction, and vegetation management principles in an effort to make photovoltaic (PV) solar energy more ecologically compatible. This includes minimizing ecological impacts associated with siting and construction and improving the ecological value of the site through habitat enhancement. Given its ecological focus, this form of agrivoltaics design is often referred to as ecovoltaics (Sturchio and Knapp, 2023; Tölgyesi et al., 2023).
The co-location of solar energy and habitat restoration (i.e., habitat-friendly solar‘ or solar-pollinator habitat) has become the most popular ecovoltaics strategy to safeguard biodiversity and improve the site’s ecosystem services output. Habitat-friendly solar designs typically focus on the planting and establishment of deep-rooted and regionally appropriate native grasses, wildflowers, and other non-invasive naturalized flowering plant species. The habitat created at these sites could support insect pollinators and other wildlife and improve other ecosystem services of the site (Figure 1).
But what ecosystem service benefits might be realized at solar facilities managed for habitat? Agrivoltaics can broadly improve the output of all classes of ecosystem services (Figure 2). Conceptually, solar-pollinator habitat has the potential to improve the outputs of all classes of ecosystem services (Table 1).
The pairing of solar energy and habitat enhancement sounds like a logical win-win for clean energy and biodiversity. However, several factors can influence the feasibility and ecological effectiveness of solar-pollinator habitat, such as geography, seed availability and cost, previous land use, soil type, and solar size and design (e.g., PV panel height and spacing). Several scientific studies have been conducted in recent years to examine different solar-pollinator habitat configurations and management options. Two studies in particular are the Innovative Solar Practices Integrated with Rural Economies and Ecosystems (InSPIRE; openei.org/wiki/InSPIREopenei.org/wiki/InSPIRE) and Pollinator Habitat Aligned with Solar Energy (PHASE; rightofway.erc.uic.edu/phase). Both projects are funded by the U.S. Department of Energy (DOE) Solar Energy Technologies Office (SETO) and include a focus on the ecological and economic implications of solar-pollinator habitat. Results from these studies have shed light on which vegetation establishes at solar sites based on their unique management needs and the amount of time required for vegetation to establish and for biodiversity responses to be measured. These studies incorporate the research findings intoguidelines and toolkits to assist the site-specific selection of seed mixes and management strategies to optimize the performance of solar-pollinator habitat based on ecological and economic (budget) objectives.
Figure 1. A) Illustration of the theoretical ecosystem services of solar-pollinator habitat. Compared to conventional groundcover, such as turfgrass, solar-pollinator habitat can provide higher-quality habitat for biodiversity. B) Example image of solar-pollinator habitat at a solar site in Minnesota. Images: Argonne National Laboratory
Table 1. Potential Ecosystem Services of Solar-Pollinator Habitat.
Ecosystem Service
Benefit
Biodiversity conservation (broadly linked to all ecosystem service classes)
Solar-pollinator habitat can safeguard biodiversity by supporting a larger diversity of organisms and communities. This could benefit several ecosystem services, such as food production (provisioning), recreation (cultural), water conservation (regulating), and nutrient cycling (supporting) (Walston et al., 2021, 2022, 2024; Blaydes et al., 2024).
Energy production (provisioning service)
Solar-pollinator vegetation can create favorable microclimates to improve PV panel performance (Choi et al., 2023).
Food production (provisioning service)
Solar-pollinator habitat can improve populations of insect pollinators and predators, which can benefit nearby agricultural production (Walston et al., 2024).
Carbon sequestration and soil health (regulating services)
The establishment of solar-pollinator habitat typically involves soil and vegetation management practices that allow for greater soil carbon sequestration over time, compared to other land uses (Walston et al., 2021).
Stormwater and erosion control (regulating service)
Deep-rooted solar-pollinator habitat can help stabilize soil and minimize runoff (Walston et al., 2021).
Nutrient cycling and air quality (supporting services)
Solar-pollinator habitat can improve nutrient cycling and air quality (Wratten et al. 2012; Agostini et al., 2021).
Aesthetics and recreation (cultural services)
Solar-pollinator habitat can improve human perception public acceptance of the solar site (Moore et al., 2021).
What are best practices for establishing solar-pollinator habitat?
There is growing science-based evidence on the ecological effectiveness of solar-pollinator habitat. Most of this research focuses on two main aspects: 1) vegetation establishment and management; and 2) biodiversity responses (Figure 2). One critical need for the solar industry has been assistance in selecting the seed mix design and vegetation management tools that would optimize the establishment of solar-pollinator habitat for a site’s specific physical characteristics (e.g., geographic region, soil type), PV site design (e.g., plant height restrictions), and budget. To help guide these decisions, the DOE PHASE project has produced a series of tools to inform solar-pollinator habitat planting implementation, seed selection, cost comparisons, and habitat assessment (Figure 3).
What do we know about the effectiveness of solar-pollinator habitat?
This section highlights objectives and outcomes from field research projects funded by DOE to understand the ecosystem services of solar-pollinator habitat. Two case studies are presented: 1) potential biodiversity benefits of solar-pollinator habitat; and 2) potential benefits of solar-pollinator habitat for soil health.
Case Study 1: If You Build It, They Will Come
A recent study from the DOE InSPIRE project examined the biodiversity responses for five years following the establishment of solar-pollinator habitat (Walston et al., 2024). The research was conducted at two Minnesota PV solar facilities owned and operated by Enel Green Power. The research team from Argonne National Laboratory, National Renewable Energy Laboratory, and Minnesota Native Landscapes conducted a longitudinal field study over five years (2018 to 2022) to understand how insect communities responded to newly established habitat on solar energy facilities in agricultural landscapes. Specifically, they investigated: 1) temporal changes in flowering plant abundance and diversity; 2) temporal changes in insect abundance and diversity; and 3) pollination services of solar-pollinator habitat to nearby agricultural fields. The team found increases over time for all habitat and biodiversity metrics. For example, by 2022, the researchers observed a sevenfold increase in flowering plant species richness, and native abundance increased by over 20 times the numbers initially observed in 2018 (Figure 4). The research team also found positive effects of proximity to solar-pollinator habitat on bee visitation to nearby soybean (Glycine max) fields. Bee visitation to soybean flowers adjacent to solar-pollinator habitat were greater than bee visitation to soybean field interior and roadside soybean flowers (Figure 5). These observations highlight the relatively rapid (less than four years) insect community responses to solar-pollinator habitat. This study also demonstrates that, if properly sited and managed, solar-pollinator habitat can be a feasible way to safeguard biodiversity and increase food security in agricultural landscapes. Photos of solar-pollinator habitat insects visiting the on-site vegetation at these sites are shown in Figure 6.
Figure 4. Observed and predicted measures of (A) flowering plant species richness and (B) native bee abundance recorded over time at two PV solar facilities planted with pollinator-friendly habitat in Minnesota. (Walston et al., 2024).
Figure 5. Observed bee visitation to soybean flowers at different field locations in Minnesota. Different letters indicate statistically different groups at the p = 0.05 level (Walston et al., 2024).
Figure 6. Solar-pollinator habitat and insects observed at solar facilities in Minnesota. Top: solar-pollinator habitat dominated by purple prairie clover and black-eyed Susan flowers, with a honeybee visiting a flower (inset). Bottom: solar-pollinator habitat dominated by yellow coneflower. Photos: Argonne National Laboratory
Case Study 2: Soil Health Benefits of Solar-Pollinator Habitat
As PV solar energy sites become increasingly common, there is growing interest in identifying potential co-benefits, in addition to energy production, that could be provided using the same land area (Choi et al., 2023). These co-benefits include a variety of both economic and ecosystem services, many of which rely greatly on preserving, restoring, and/or maintaining a healthy soil environment, which is itself a valuable ecosystem service. Healthy soils are key to supporting and nurturing plant growth, and solar facilities offer a unique opportunity to improve soils that are either naturally low-quality or have been degraded from decades of agriculture. This can be accomplished through a variety of strategic planning initiatives and land management practices that focus on minimizing soil and vegetation disturbances and encouraging the establishment of ecologically friendly and sustainable ecosystems. By understanding the relationships and interactions that exist between plants and the soil environment, wecan gain valuable insights into how to maximize land-use efficiency and increase sustainable land management practices over the large areas of land that will be required for utility-scale solar facility development needed to achieve the renewable energy goals of the United States by 2050.
Just as healthy soil is necessary to support plant growth, plants can help improve soil health through various mechanisms (Figure 7). Soil health is characterized by a combination of physical, chemical, and biological properties, including bulk soil density, water infiltration and holding capacity, soil organic carbon and available nutrient contents, soil pH and cation exchange capacity, and microbial activity and diversity. Plant roots, especially those from deep-rooting perennial species (such as are found in many pollinator seed mixes), help reduce soil erosion and improve soil structure by providing a supportive network of course and fine roots that stabilize soil particles and aggregates while simultaneously improving water infiltration. Plants also supply organic matter, carbon, and other nutrients to the soil environment viasurface leaf litter, root exudates, and root litter. These organic matter inputs serve as nutrient pools for micro- and macro-organisms in the soil, and to increase soil water-holding capacity. Additionally, a portion of the carbon from plant organic matter inputs and microbial necromass will end up becoming associated with soil minerals to form mineral-associated organic matter (MAOM), which can have very long residence times in soil and serve as a carbon sink for atmospheric CO2 (Bai and Cotrufo, 2022).
There are many ways that vegetation can be used at solar facility sites to provide additional benefits beyond increasing soil health. While there is much research that has shown the positive effects of vegetation on soil health, research that specifically addresses how soil health indicators are affected by land management practices at solar facilities is lacking. Given what is known, it is reasonable to expect that sustainable vegetation management at solar facilities will result in improved soil health over time. However, this is likely dependent on the degree of disturbance sustained during site construction, and possibly any number of other controlling factors, such as local climate, native vegetation, and/or soil type. For example, Choi et al. (2020) found that even after seven years of revegetation at a solar facility site in Colorado, carbon and nitrogen concentrations had not recovered to comparable levels of adjacent reference grasslands. The authors attributed this to the significant amount of topsoil removal and grading that occurred during site construction, which significantly disturbed and mixed the soil profile, resulting in severely reduced surface carbon and nitrogen levels. However, this study did not compare vegetated areas to non-vegetated areas within the site. Another study by Choi et al. (2023) did make this comparison at a site in Minnesota where topsoil removal and grading were avoided. The researchers found that revegetated areas had significantly more carbon, nitrogen, and other nutrients levels relative to the areas that were left bare and were ultimately similar to adjacent control plots (Figure 8). This disparity in results and lack of clear data presents a challenge to understanding soil health dynamics as it relates to land management practices at solar facilities.
Fortunately, DOE SETO has sponsored a project whose sole focus is to gather soil data from solar facilities across a wide range of environments in the United States that can hopefully address this question. This project, Ground-mounted Solar and Soil Ecosystem Services, is being led by Argonne National Laboratory and will provide standardized guidance on measuring and analyzing soil parameters central to soil health at solar facilities, and establish a national database of solar facility soil data that will hopefully shed light on how vegetation and land management at solar facilities can impact soil health over time.
REFERENCES
Agostini, A., M. Colauzzi, and S. Amaducci. 2021. Innovative agrivoltaic systems to produce sustainable energy: an economic and environmental assessment. Applied Energy.281: 116102.
Bai, Y. and M.F. Cotrufo. 2022. Grassland soil carbon sequestration: Current understanding, challenges, and solutions. Science. 377: 603–608.
Blaydes, H., S.G. Potts, J.D. Whyatt, and A. Armstrong. 2024. On-site floral resources and surrounding landscape characteristics impact pollinator biodiversity at solar parks. Ecological Solutions and Evidence. 5: e12307.
Choi, C.S., A.E. Cagle, J. Macknick, D.E. Bloom, J.S. Caplan, and S. Ravi. 2020. Effects of Revegetation on Soil Physical and Chemical Properties in Solar Photovoltaic Infrastructure. Frontiers in Environmental Science. 8: 140.
Choi, C.S., J. Macknick, Y. Li, D. Bloom, J. McCall, and S. Ravi. 2023. Environmental Co‐Benefits of Maintaining Native Vegetation with Solar Photovoltaic Infrastructure. Earth’s Future. 11: e2023EF003542.
Millenium Ecosystem Assessment (MEA). 2005. Ecosystems and Human Well-Being: Synthesis. Island Press, Washington, DC.
Moore, S., H. Graff, C. Ouellet, S. Leslie, D. Olweean, and A. Wycoff. 2021. Developing Utility-Scale Solar Power in Michigan at the Agriculture-Energy Nexus. Stakeholder Perspectives, Pollinator Habitat, and Trade-offs. Report for the Institute for Public Policy and Social Research, Michigan State University. Available at ippsr.msu.edu/mappr/developing-utility-scale-solar-power-michigan-agriculture-energy-nexus. Accessed March 29, 2024.
Sturchio, M.A. and A.K. Knapp. 2023. Ecovoltaic principles for a more sustainable, ecologically informed solar energy future. Nature Ecology & Evolution. 7: 1746-1749.
Tölgyesi, C., Z. Bátori, J. Pascarella, et al. 2023. Ecovoltaics: framework and future research directions to reconcile land-based solar power development with ecosystem conservation. Biological Conservation. 285: 110242.
Walston, L.J., Y. Li, H.M. Hartmann, J. Macknick, A. Hanson, C. Nootenboom, E. Lonsdorf, and J. Hellmann. 2021. Modeling the ecosystem services of native vegetation management practices at solar energy facilities in the Midwestern United States. Ecosystem Services. 47: 101227.
Walston, L.J., T. Barley, I. Bhandari, B. Campbell, J. McCall, H.M. Hartmann, and A.G. Dolezal. 2022. Opportunities for agrivoltaic systems to achieve synergistic food-energy-environmental needs and address sustainability goals. Frontiers in Sustainable Food Systems. 16: 932018.
Walston, L.J., H.M. Hartmann, L. Fox, J. Macknick, J. McCall, J. Janski, and L. Jenkins. 2024. If you build it, will they come? Insect community responses to habitat establishment at solar energy facilities in Minnesota, USA. Environmental Research Letters. 19: 014053.
Wratten, S.D., M. Gillespie, A. Decourtye, E. Mader, and N. Desneux. 2012. Pollinator habitat enhancement: benefits to other ecosystem services. Agriculture, Ecosystems & Environment. 159: 112-122.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2024/10/image-13.png7201231A. J. Pucketthttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngA. J. Puckett2024-10-01 10:26:092024-10-01 10:26:27Ecosystem Services of Habitat-Friendly Solar Energy
In 2012, Caleb Scott was working with solar developers to help seed and build sites. As he got more involved in the industry, his job expanded to help properly maintain these sites. Scott began mowing the solar sites but quickly realized it was a challenging task. Every site was different, with varying degrees of ground levelness, infrastructure spacing, and site vegetation-management requirements. Additionally, he had to be careful around the panels to avoid any damage from his equipment.
When not working on-site, Scott, a seventh-generation farmer, took care of his flock of sheep. He realized that sheep would do a much better job at vegetation management than mowers and would get around easier. However, despite his experience in managing sheep and solar vegetation, it was difficult to convince the industry that sheep could be a valuable form of vegetation management. Scott began to work with Cornell University to collaborate with solar developers and use the University’s property to perform a demonstration site for solar grazing. This work gave him proof of concept, and he began grazing on solar sites in 2013.
Caleb Scott of United Agrivoltaics at a solar site. Photo: Caleb Scott
After Scott received his first solar grazing contract, he was able to grow and strengthen his practice. In addition to being a founding board member of the American Solar Grazing Association, he also created United Agrivoltaics, one of the first and oldest agrivoltaic sheep-grazing firms in the U.S. United Agrivoltaics functions as a co-operative to promote expansion of the solar grazing industry and now has 103 sites in nine states. The organization uses Scott’s unique background to provide vegetation management with solar grazing, as well as consulting to implement agrivoltaics on solar projects.
Scott and the other 80+ graziers involved with United Agrivoltaics pride themselves on creating a healthy, shared-use system. While their specialty is in solar grazing with sheep, they have also used chickens, turkeys, rabbits, and pigs to help maintain the site vegetation and increase the overall productivity of the site. Scott uses three different styles of grazing: mob, rotational, and low-impact sustained grazing. These management methods provide financial benefits in some cases and health benefits in others. Scott’s main priority when deciding which style to use depends on what is going to work best for the on-site forage content, as well as for his farm and animals.
United Agrivoltaics recognizes the variability between sites and offers different tiers of service to help overcome this. This is a major benefit for asset owners as it allows them to form a contract and relationship with one party for all their site-management needs. Scott’s full management package includes services such as exterior perimeter mows, spraying herbicide as needed to control noxious or invasive species, and a clean-up mow to manage the vegetation the sheep did not eat.
The flexibility of United Agrivoltaics’ services has helped the organization grow over time. They are currently grazing 15,000 sheep on more than 5,100 acres of solar sites, with a goal to double the number of sheep in the upcoming year. Scott himself is grazing 650 sheep on 200 acres, and this growth allowed solar grazing to become his full-time job. He and United Agrivoltaics have purchased and acquired other companies along the way to help them grow.
As United Agrivoltaics continues to expand, they ensure that their services remain competitive with the costs of mechanical mowing. The grazing costs will vary depending on location and which rating scale the site owner chooses for their site. In an area with farm readiness considerations being met, fees can range from $380/acre for the full management package to more than $1,500/acre. Despite the large range in pricing, Scott recognizes that generalizing pricing would have a negative impact on the solar grazing industry due to the number of variables that determine contract pricing, such as site management requirements and feasibility for the grazier.
A trio of sheep on a solar site. Photo: American Solar Grazing Association
In addition to difficulties associated with selecting the correct pricing for a site, insurance can be an added challenge when solar grazing, as extra costs typically do not outweigh the value of the contract. One of Scott’s biggest initial challenges in the solar grazing industry was learning to manage the site as dictated by the contract. In some cases, he has had to change his vision of what he thinks the site should look like in order to meet the site owner’s needs. Farming motives can differ from solar operation motives and requires calculating the correct stocking densities.
To help overcome these challenges, Scott’s advice is to reach out and talk to someone who has done it before to ask a lot of questions and educate yourself.
“This industry requires a lot of teamwork, especially since the solar grazing industry is so young and we have so few sheep in the country. We need to help and support one another.” — Caleb Scott.
Teaming up with individuals who have prior experience could allow for sharing things like insurance (costs), equipment, and other resources, which could mean saving additional money. It is also beneficial to discuss contracts with those who have experience. Scott recommends finding an organization, like ASGA, that helps farmers and joining them to learn and share ideas.
This teamwork represents Scott’s overall goal for the solar grazing industry and United Agrivoltaics, which is to have as many sheep in the organization as are currently in the U.S. right now–over 3 million. He wants to accomplish this by expanding his company and farming group nationwide. By doing so, he hopes to see the sheep industry increase tenfold in the next 20 years, and he wants to be a part of that change. If this were to be accomplished, it would undoubtedly afford tremendous benefits for the solar-grazing industry.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2024/09/Caleb-Scott-03.jpg387283A. J. Pucketthttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngA. J. Puckett2024-09-17 09:19:552024-09-19 12:01:14Case Study: Caleb Scott, United Agrivoltaics
Julie Bishop’s involvement in the solar grazing industry began with a snowball effect after receiving a herding dog. Once she acquired a herding dog for her grazing operation, she trained it in herding at her home, which progressed to owning ewes and lambs and operating a hobby sheep farm. Then, in 2013, Bishop discovered that there was a solar field just five miles from her New Jersey home. She soon realized that sheep could manage the vegetation just as well as the traditional gas-powered mowers that were used on the site. She then got to work to make her idea a reality.
Bishop began the lengthy process of getting her sheep on that solar site. The land had originally been used as agricultural land but had been forfeited for the sole use of solar. Bishop and the solar company had to go to the municipality to ask for agriculture to be reinstated at that site. Additionally, they had to appear in front of the zoning and planning departments, send a letter to the community, and hold an open comment period in order to receive a variance. Finally, after nearly a year, Bishop was approved to move forward and was able to bring her sheep on-site for grazing.
A sheep under solar panels. Photo: American Solar Grazing Association
Despite being one of the first solar graziers and not having connections to consult, Bishop was able to successfully manage her first site. News of this success spread, and additional companies reached out to Bishop to form new contracts. Since then, she has grazed in three states.
Bishop says that solar grazing changed her life. Once a teacher, she is now a successful farmer who is only able to have her sheep operating at a larger capacity than she initially anticipated because of solar grazing. Her home farm is six acres, but the solar sites she grazes provide her the space she needs to expand her operation. She is now at the point of maximum capacity unless she changes her management style.
Currently, Bishop puts dry ewes on the solar site in the spring, then adds and removes rams, and brings the ewes home at the end of the grazing season to lamb around November and December. The lambs are then weaned, and the dry ewes return to the solar site. To expand her operation, Bishop would instead start lambing on the solar site around April and May. While the lambing process requires a lot of initial work, it would lead to a less labor-intensive and lower input management for Bishop. Along with changing the way she grazes, Bishop is waiting for more solar sites that are in close proximity to her home farm.
In addition to the challenges with expanding, Bishop identified some aspects of solar sites that can prove difficult when compared to traditional sheep management, such as site layout, trucking in water, and exterior perimeter fences that lack proper predator-proofing. After years of experience, Bishop has the knowledge and practice to overcome these challenges. For example, she worked with the solar developer at a site to build a bracket to prevent sheep from rubbing up against an emergency switch. The bracket keeps the equipment safe from the sheep but still provides easy access for a person as needed.
Sheep moving through a solar site. Photo: AgriSolar Clearinghouse
The sites that Bishop grazes were not created with the intention of solar grazing, and this can lead to difficulties such as a poor line of sight when moving sheep. Bishop has been able to overcome this issue with the assistance of a well-trained herding dog. It is only fitting that the reason she became involved in the solar grazing industry is now one of her greatest assets.
In her solar grazing work, Bishop has seen a shift in community perception. During the initial stages of solar development, there was pushback from communities that did not want agricultural land being used for solar development. Once Bishop brought the idea of solar grazing to the community, there was still some hesitation toward the new concept, and no one knew what to expect. Her success has allowed the community to view dual-use solar in a different way, and there is now a positive perception of solar grazing in her area.
As one of the first solar graziers, Bishop is well equipped to provide advice to those looking to join the industry. She suggests teaming up with someone who has experience in solar grazing to learn the ins and outs of the practice. Additionally, patience is necessary. It is difficult to plan, and there are often periods of waiting for approvals and construction. Finally, she recommends carefully selecting sheep that will be a good fit for the management system.
Bishop is a true example of the beneficial opportunities that solar grazing can provide. The additional land access granted to her through her contracts allowed her to not only expand her operation, but also to become an innovator in the expanding industry.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2024/09/sheep-solar-ASGA-1.jpg322482A. J. Pucketthttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngA. J. Puckett2024-09-17 09:11:282024-09-19 11:57:39Case Study: Julie Bishop, Solar Sheep LLC
For several years, NCAT has been highlighting the benefits of agrivoltaics through the AgriSolar Clearinghouse project. And just as there are significant benefits to agrivoltaics, there are also barriers that keep more sites from being developed across the country, such as extra costs for site design, reduced energy production per acre, regulatory issues, and community pushback. In the current environment, it can take a passionate, mission-driven company to lead the way in changing how solar is integrated into agricultural systems. BlueWave is one such company.
BlueWave, a Boston-based solar development company, focuses on agrivoltaic solar projects, helping farmers design and integrate solar energy production on their farmland. One of the most prolific agrivoltaic developers in the country, BlueWave has recently added five more of these sites to their project portfolio, which totals over 91 acres and produces over 19 megawatts (MW) of electricity—enough to power more than 2,500 homes.
BlueWave’s latest series of installations began in 2023 and will be completed this year in four separate towns across Massachusetts. These systems were designed for adaptive dual-use purposes, meaning that a variety of agricultural enterprises can take place under the panels. Collectively, these solar installations represent many major agrivoltaic practices, including vegetable production, hay making, and grazing of sheep and cattle. Also, the forage blends used on the grazing sites include plants that are beneficial for pollinators.
(Caption: The increased height of the panels at this Dighton location allows the farmer to access the land with agricultural equipment. Photo: BlueWave)
One project in Dighton, Massachusetts, encompasses 21 fenced acres with 3.6 MW of installed solar panels that will produce an estimated 5,660 megawatt-hours of energy annually. Battery storage will contribute to the resilience of the electric grid by allowing the installation to provide clean energy to the grid when the sun isn’t shining. The panels here are raised 10 feet off the ground with 25 feet of space between the rows of panel post supports. This spacing will allow for agriculture equipment operation under the panels. BlueWave will be managing this site for the 2024 season, planting cover crops to improve soil health and fertility in preparation for vegetable production on the site. A small section of the land will be used to grow vegetables this year, though the final agricultural use will be determined by the farmer and will be adaptable over the years.
An hour away in the town of Douglas, a very similar solar installation will soon be completed and will be managed by a local farmer. Just over 20 acres was fenced to house 3.4 MW of power production. These panels are also raised and spaced to allow the farmer to maintain and harvest the hay fields below the panels.
A third, slightly smaller BlueWave agrivoltaic site was completed in Haverhill, a town in the far northeastern part of the state. Almost 15 acres were fenced in here with just over 2 MW of solar installed. Again, the panels were raised high enough to allow for grazing or tractor work on the fields
below the panels. A combination of vegetable production and livestock grazing by local farmers is the most likely use for this location.
(Caption: This site in Haverhill, Massachusetts, stands ready for grazing and vegetable production by local farmers. Photo: BlueWave)
On the other side of the state, a 2.4-MW system covering almost 12 acres was developed near the town of Palmer. This system, like the others, is designed for tractor work and large livestock grazing. The site will continue to be used by the landowner, Burgundy Brook Farm, for making hay and to graze cattle. As with the other sites that will see the use of farming equipment under the panels, the solar arrays are elevated, and the support posts are spaced to accommodate equipment and to allow enough sunlight to grow crops and forages under the panels.
A fifth BlueWave installation, also in Palmer, has a more conventional design with the panels closer to the ground and the panel rows closer together. But even here, the plan is for sheep grazing to manage the vegetation under the panels. Solar grazing like this can benefit farmers looking for land to graze their sheep. It can be less costly for the solar site management than hiring a land-management company or landscaper to do the job. And the generous amount of shade provided by the panels has multiple benefits for the sheep herd and the forage being grown. (See the recent ATTRA blog post “Throw Some Shade: Protecting Livestock from Heat Stress.”)
(Caption: Burgundy Brook Farm owns the land at this site in Palmer and will continue to graze cattle and make hay here. Photo: BlueWave)
In a further commitment to support agricultural production, BlueWave provided specialized farm equipment for use at several of these sites. For the site in Dighton, BlueWave has purchased a Carraro 80-hp tractor, a 3-shank chisel plow, a rotary harrow and seeder, a flail mower, and a 3-point to skid-steer adapter plus buckets. They anticipate purchasing an additional cultivating tractor, plastic mulch layer and water wheel transplanter for use on this site. Additionally, BlueWave purchased a John Deere 5425 and a Kuhn baler for Burgundy Brook Farm to use in their hay and grazing operation at the site in Palmer.
Agrivoltaics can help mitigate many of the challenging issues associated with the intense expansion of utility- scale solar development happening across the country. It can keep land in agricultural production while simultaneously producing valuable solar energy for the grid. The shade provided by the solar arrays can help retain soil moisture and improve the growth of many types of crops and forages with reduced irrigation. The shade also reduces heat stress and improves herd health when the land is used for grazing. The financial benefits for the farmer can help keep high-value land as farmland and facilitate the transfer of that land to the next generation. BlueWave understands these possibilities and is creating a space for them with on-the-ground agrivoltaic installations in Massachusetts.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2024/09/Dighton-1.jpg936702A. J. Pucketthttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngA. J. Puckett2024-09-12 13:13:162024-09-12 13:29:41Expanding Agrivoltaics in Massachusetts
By Dan Salas and Ben Campbell, University of Illinois Chicago Sustainable Landscapes Program
Building out the renewable energy capacity needed to make a clean energy transition is no easy task. Siting projects, engineering designs, addressing community interests, and obtaining the resources for construction requires thoughtful planning. Increasingly, one design aspect is gaining more attention: plants.
As important as any solar panel array, substation, or other “hard” infrastructure, the plants making up the ground covers are critical to site management. Vegetation on renewable energy development (particularly community- and utility-scale solar) has gained attention for its ability to provide added benefits like pollinator and wildlife habitat, soil health, runoff reduction, carbon capturing, and community aesthetics.
Plant communities, just like other design components, are influenced by many factors. Often underestimated as “the green stuff,” designing, installing, establishing, and maintaining plant communities on large solar arrays can be costly and complex. When done well, it can create an asset to both the project and community. When implemented poorly, it can become a costly and long-term headache for site owners and communities.
Across the country, communities are asking that solar projects include pollinator habitat in their vegetation planning. As a result, solar developers and site owners have had to face questions like:
What types of plants are included in solar pollinator vegetation?
How do I establish it?
How much will this cost?
If successful, will it result in improvements for local pollinators?
How do we sustain vegetation investments over the duration of solar project lifespan?
To address these questions, in 2021, The University of Illinois Chicago, U.S. Department of Energy Solar Energy Technologies Office Awardee, began the Pollinator Habitat Aligned with Solar Energy (PHASE) project. This four-year project studies the ecological, economic, and performance impacts of solar pollinator vegetation. Building on this research and industry collaboration, the project also created a suite of decision tools to help site designers and vegetation planners with making informed decisions about plant selection, vegetation management, and addressing project and community goals.
The solar pollinator vegetation implementation manual is an interactive online document to guide users through considerations for vegetation decisions at large- scale solar sites. It also helps identify site goals, pitfalls for implementation, and how to sustain desired benefits over the duration of a project lifespan.
A cost comparison calculator was developed to help project teams consider upfront and long-term costs of plant communities designed for projects. This tool is offered in two formats: one is a simplified online calculator for quick estimates, and the other is a downloadable Excel tool that allows teams to edit more variables and create a more refined estimate. The outputs of this tool can help inform decisions on construction and operational budgets.
Once target vegetation communities have been identified and budgeted for, the seed selection tool can be used to find species suitable for seed-mixed development. Users can then connect with seed vendors and share outputs to purchase seed material. Project design teams may also use this tool to confirm seed mixes identified for a site and potential substitution species, if needed. Outputs of this tool can be shared with project teams and seed vendors to help seed-mix development in site, design, and vegetation management planning.
Once vegetation is established, the pollinator habitat assessment modules can help verify that vegetation was successfully established and the desired pollinator benefits have resulted from the work completed. A three-tiered series of assessments offers scalability, depending on time and knowledge resources available. These rapid assessments are supplemented by a series of guidance documents that help users decide sampling regimes monitoring needs and reduce monitoring costs.
Together, these tools offer the renewable energy industry a series of resources that will help improve vegetation management across thousands of acres. While developed with solar pollinator vegetation in mind, these tools are also applicable to other vegetation management programs. Better vegetation management and planning combined with renewable energy creates a brighter future for humans and nature alike.
About the Solar Energy Technologies Office
The U.S. Department of Energy Solar Energy Technologies Office accelerates the advancement and deployment of solar technology in support of an equitable transition to a decarbonized economy. Learn more at energy.gov/eere/solar.
About the University of Illinois Chicago Sustainable Landscapes Program
https://www.agrisolarclearinghouse.org/wp-content/uploads/2024/09/chelsea-WvusC5M-TM8-unsplash3-scaled.jpg19202560A. J. Pucketthttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngA. J. Puckett2024-09-09 10:19:042024-09-12 15:30:50Tools for Building a Brighter and Greener Future
This review examines three key agrivoltaic setups—static tilted, full-sun tracking, and agronomic tracking—dissecting their engineering features’ roles in optimizing both the electricity yield and the fruit productivity of some fruit crops.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2024/03/AgriSolar-Library-90x90-1.png9090A. J. Pucketthttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngA. J. Puckett2024-04-10 12:55:282024-04-10 12:55:29Fruit Crop Species with Agrivoltaic Systems: A Critical Review
This work aimed to study the yield and nutritional characteristics, as well as feeding value for ruminants of Durum wheat biomass grown under an agrivoltaic system.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2024/03/AgriSolar-Library-90x90-1.png9090A. J. Pucketthttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngA. J. Puckett2024-03-27 11:30:322024-03-27 11:30:33Determination of Feed Yield and Quality Parameters of Whole Crop Durum Wheat: Biomass Under Agrivoltaic System
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