This episode features a conversation between Stacie Peterson, NCAT’s Energy Program Director and Manager of the AgriSolar Clearinghouse, and Pete Berthelsen, Executive Director of The Bee and Butterfly Habitat Fund and President of Conservation Blueprint.
It is the fourth in a series of AgriSolar Clearinghouse podcasts that are being featured on ATTRA’S Voices from the Field podcast.
Pete and Stacie discuss the benefits of pollinator habitat at solar energy sites, pollinator habitat design, seed mixes, pollinator health and quality, and what anyone can do to help pollinators in their own backyard.
This material is based upon work supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under the Solar Energy Technologies Office Award Number DE-EE000937. Legal Disclaimer: The views expressed herein do not necessarily represent the views of the U.S. Department of Energy or the United States Government.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2023/03/AgriSolar-Pollinators.jpg7261089ATTRA - Sustainable Agriculturehttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngATTRA - Sustainable Agriculture2023-03-01 13:48:222023-03-01 13:48:22AgriSolar Podcast Ep. 4: Birds, Bees, and Butterflies – Solar Pollinator Habitat
In this article, researchers propose 19 directly measurable indicators associated with 16 ecosystem services within three major stocks of natural capital (biodiversity, soil and water) that are most likely to be impacted by the development of solar parks.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2022/01/AgriSolar-Library-.png400600Anna Adairhttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngAnna Adair2023-02-22 18:59:152023-02-22 18:59:16Towards a standardized protocol to assess natural capital and ecosystem services in solar parks
Agrisolar Clearinghouse Hosts Farm to Table Event at Biosphere 2
The AgriSolar Clearinghouse held an AgriSolar Farm to Table event at Biosphere 2 in Tucson, Arizona, last week, in partnership with the GreenBiz23 conference. Similar to the AgriSolar Clearinghouse Follow the Sun field trips, the AgriSolar Farm to Table events bring members of the agrisolar community together to see, touch, taste, and celebrate the delicious foods grown and grazed at solar farms around the country.
The AgriSolar Clearinghouse, along with sponsor Enel North America and partners from Biosphere 2, Connexus Energy, NREL, InSPIRE, Jack’s Solar Garden, and Columbia University, networked with attendees while they enjoyed lunch and refreshments prepared by Chefs Erin, Mateo, and Janos. The menu highlighted foods grown and grazed under solar arrays, including honey, beans, lamb, salad greens, potatoes, and saffron. Discussions ensued amongst attendees while Enel awarded Bare Honey solar-grown honey and the highly coveted agrivoltaic Lego sets.
During the lunch, attendees also enjoyed learning about the Biosphere 2’s agrivoltaic project from Dr. Greg Barren-Gafford and graduate students Kai Lepley, Nesrine Rouini, Alyssa Salazar, and Caleb Ortega. Dr. Barren-Gafford provided a background on Biosphere 2, as well as research conducted at the site and its application to agrivoltaics throughout the country.
Also attending the event was Sarah Bendok, a high-school freshman from Phoenix, Arizonaand founder of Growing Green, a 501(c)(3) nonprofit organization focused on improving agriculture while simultaneously decreasing negative impacts on the environment. Bendok is planning to create an agrivoltaic site at her local community garden and is participating in the AgriSolar Clearinghouse’s peer-to-peer mentoring program under the guidance of Dr. Barron-Gafford and graduate student Nesrine Rouini in pursuit of obtaining the Girl Scout Gold Award.
Thank you to Dr. Barron-Gafford and the Greg Barron-Gafford Research Group; Jesse Puckett; Enel; Rob Davis; Biosphere 2; University of Arizona; Chefs Erin, Mateo, and Janos; the AgriSolar Clearinghouse team; and all the good people that braved the weather to join our agrisolar community in the celebration.
University of Arizona Researchers Awarded $1.2 Million to Explore Agrisolar
“Researchers will test three different watering strategies, ranging from intensive irrigation to almost no water, and use the shadows cast by solar panels to provide benefits to the agricultural process. The most heavily watered plot will closely replicate current agricultural practices and include plants with greater water needs, like tomatoes and varieties of lettuce. The second plot will involve watering to establish growth, but much less thereafter, to reintroduce native grasses. The final plot will require little to no watering and include ‘climate smart’ plants that have grown for hundreds, if not thousands, of years in the region: prickly pear, agave, legumes and others.” – University of Arizona
Germany’s Vattenfall Invests in 76-Megawatt Agrisolar Project
“For the first time, Vattenfall will implement this innovative concept of land use on a commercial scale with partners. The aim of the project in Tützpatz is to combine module types on different mounting systems with suitable agricultural uses over an area of 95 ha, and thus gain further practical experience for future commercial projects of this kind. According to current plans, construction at Tützpatz is scheduled to start in early summer 2023.” a– Reve
https://www.agrisolarclearinghouse.org/wp-content/uploads/2022/10/agrisolar-roundup-photo-scaled.jpg25602378A. J. Pucketthttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngA. J. Puckett2023-02-22 17:20:082023-02-28 08:49:22AgriSolar News Roundup: Farm to Table Event at Biosphere 2, UAZ Agrisolar Research, German Agrisolar Pilot Project
https://www.agrisolarclearinghouse.org/wp-content/uploads/2022/01/AgriSolar-Library-.png400600Danielle Miskahttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngDanielle Miska2023-01-04 16:48:112023-02-21 11:11:50Fact Sheet: Making the Case for Solar Beekeeping
DOE Solar Energy Technologies Office Announces $8 Million in Projects for Agrivoltaics Research
“The U.S. Department of Energy (DOE) Solar Energy Technologies Office announced $8 million in new projects that will research agrivoltaics—agricultural production, such as crop production, livestock grazing, and pollinator habitat underneath solar panels and/or in between rows of solar panels.
AgriSolar Clearinghouse partner Greg-Barren Gafford from The University of Arizona is among the award recipients. Learn more about award recipients, which also include Rutgers and Ohio State University, here.
USDA Announces Climate Smart Commodity Awards
USDA Announced 71 climate-smart commodity awards in round 2 of the initiative. Among the awardees is The University of Texas Rio Grande Valley (UT-RGV), with the project “Validating Agrivoltaic Technology with Underserved Agricultural Producers.”
The AgriSolar Clearinghouse will serve as a technical assistance provider for this project. This work will include the production of outreach materials, education, and workshops to promote benefits to potential agrivoltaic adopters in the Rio Grande Valley.
“JUA Technologies, an agriculture technology start-up that manufactures solar-powered crop dehydrators, has received a two-year, $600,000 Phase II Small Business Innovation Research (SBIR) grant from the U.S. Department of Agriculture (USDA) to develop its technology.” – PV Magazine
Italian Research Shows Benefits of Growing Soybeans Using Agrivoltaics
“Scientists from Università Cattolica del Sacro Cuore in Italy have investigated different shade depth treatments on soybeans grown under an elevated agrivoltaic system in Monticelli d’Ongina, Italy. ‘Our work confirmed that soybean is shade tolerant and can be grown in combination with solar power generation. Considering not only soy but more crops and extensive crops in a large scale agrivoltaics is useful for increasing the sustainability of the agrivoltaic system itself.’ researcher Eleonora Potenza told PV magazine. – PV Magazine
Meta Obtains 720MW of Solar from Silicon Ranch
“Facebook owner Meta Platforms will power additional data center operations around the Southeast with 720 MW of new solar developments in Georgia and Tennessee with Silicon Ranch. Silicon Ranch is partnering with the Walton Electric Membership Corporation and the Tennessee Valley Authority (TVA) to supply power from seven new solar facilities to power Meta’s data centers in the two Southeast states, respectively.” – PV Magazine
https://www.agrisolarclearinghouse.org/wp-content/uploads/2022/10/agrisolar-roundup-photo-scaled.jpg25602378A. J. Pucketthttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngA. J. Puckett2022-12-14 10:34:432023-01-06 16:10:33AgriSolar News Roundup: DOE Agrivoltaics Funding, USDA Climate Awards, Solar Powered Dehydrator
https://www.agrisolarclearinghouse.org/wp-content/uploads/2022/10/Picture6.jpg7191079Danielle Miskahttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngDanielle Miska2022-11-17 17:00:162023-01-04 16:24:34Fact Sheet: Making the Case for Solar Beekeeping
Lake Pulaski is an agrivoltaic solar power plant site developed by Enel Green Power that spans over 68.2 acres in Buffalo, Minnesota. This site is one of 16 developed for the Aurora Distributed Solar LLC project in 2017, supporting pollinators, grazing, and an apiary. The layout consists of 34,668 panels at 315 watts each, spanning over 500 individual arrays. The total plant system size is 10.92MW (dc). Each panel has a SolTech single, horizontal axis tracker to follow the sun path and optimize production. This tracker was chosen over the more standard axis-pole trackers due to their ability to allow curves in the array installation to accommodate the rolling landscape. The developers strived to install the system with minimal land disturbance to maintain the landscape and reduce excavation, thus allowing the panels to move with the rolling hills. Panel height was design to be approximately 2.5 fee from the ground at the maximum tilt angle of 45o to allow grazing sheep to pass under without harm to sheep or panels. This sets the total height of each array at a maximum of 10 feet.
The landscape is grazed once a year near the end of September for one month to reduce the need for mowing, save on labor and gas, and maintain a healthy soil chemistry. Graduate students at Temple University in Pennsylvania are conducting studies on the benefits of grazing, such as soil composition, a reduced mowing, and a reduction in spraying for weeds. Eight of the 16 Aurora project sites are grazed for research purposes. Occasional mowing is required if the area has a high-growth year. Minnesota Native Landscapes (MNL) developed the original native seed profile to help promote pollinator activity under the panels. The final seeding was completed by Westwood Professional Services. MNL also maintains the pollinator and native landscape. Bare-grounded spraying is used to kill off unwanted invasive species, such as thistle. These areas are then fenced off to prevent wildlife and sheep in the area. Soil samples are taken from sprayed and mowed areas for research. Lake Pulaski also promotes the bee population by allowing bee farmers to move their hives next to the site to help pollinate the area and grow healthier bees.
Lake Pulaski is not without maintenance needs. The enormity and complexity of the site requires technicians, plant experts, landscapers, and sheep farmers to ensure that the site function as designed. Enel Green Power does most of the technical maintenance, while MNL sprays and maintains the plants. The SolTech trackers require slightly more maintenance than pole trackers, and they can go offline due to storms, sheep knocking the sensors, and other natural causes. Background research is being conducted by ENEL to determine whether the tracking system is worth the extra maintenance. At the end of the site’s service life, which is typically 25 years, the developers hope to decommission the system and return the land to agriculture with richer soil than the gravel alternative and unharmed adjacent landscapes. The research from this site will help quantify the benefits that agrivoltaics can bring to both solar development and agriculture industries.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2022/10/080422-agrisolar-40-scaled.jpg17092560Danielle Miskahttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngDanielle Miska2022-10-19 16:30:142022-12-08 16:19:10Case Study: ENEL Green Power’s Lake Pulaski
Developer:Pine Gate Renewables Location: Medford, Oregon Size: 13 MW, 41 acres (scorecard) Soil type: Clay Annual precipitation: 49 inches Ground cover: A diverse pollinator seed mix of more than 30 types of native wildflowers and grasses
Funded by the U.S. Department of Energy’s (DOE) Solar Energy Technology office, the Photovoltaic Stormwater Management Research and Testing (PV-SMaRT) project from Great Plains Institute, DOE’s National Renewable Energy Laboratory, Fresh Energy, and the University of Minnesota is using five existing ground-mounted photovoltaic (PV) solar sites across the United States to study stormwater infiltration and runoff at solar farms. Together, the five sites represent a range of elevations, slopes, soil types, and geographical locations that will help solar developers and owners, utility companies, communities, and clean energy and climate advocates better understand how best to support solar projects and the host communities in which they are built, in particular lowering the costs of clean energy development while ensuring protection of the host community’s surface and ground waters.
Situated on 41 acres of agricultural land that previously had a rich, long tradition of dairy grazing, the 13-megawatt (MW) Eagle Point Solar project owned by Pine Gate Renewables is part of the company’s SolarCulture Initiative, which promotes sustainable agriculture, collaboration with communities, and research for intelligent solar development. In the early morning—and again in the late evening—the panels at this site sit about one meter above the ground, rotating to three meters above the ground at midday. This allows mowing equipment to pass through when the site needs maintenance, an essential aspect of maintaining quality habitat at solar sites.
After determining that experienced landscapers would be able to restore and maintain the groundcover, Pine Gate decided to make Eagle Point one of the first projects for the SolarCulture program. A flat site with clay soil and 16 inches of annual rainfall, this site’s PV-SMaRT monitoring equipment was installed in August of 2020 and will be in operation through August of 2022.
Pine Gate hired landscape design consultant Regenerate to come up with a vegetation plan, and Understory Consulting, an ecological consulting and restoration service nonprofit operating in Oregon and northern California, was chosen to develop a multi-year plan to seed the site with native flowers and grasses tucked underneath the site’s tracking photovoltaic (PV) panels in two-in-portrait configuration. The seed mix was developed by Sean and Kathryn Prive, who Maggie Graham, a researcher with Oregon State University and ecologist at Understory, describes as the “dreamers behind the project who led the restoration at the site.” The multi-year plan developed by the Prives is intended to restore the understory of the solar site to a native prairie and support native and domesticated pollinators.
Remarking on the site’s dual uses, Maggie mentions the support the site provides for both pollinator habitat and seed collection for the Rogue Native Plant Partnership. Facilitated by Understory, the Rogue Basin Partnership, and the Medford, Oregon, District Office of the U.S. Department of Interior’s Bureau of Land Management, the Rogue Native Plant Partnership focuses on increasing the diversity and availability of native plant materials in the Rogue Valley, a much-loved valley region in southwestern Oregon known for its wild and scenic Rogue River that runs from Oregon’s famous Crater Lake out to the Pacific Ocean.
When asked about challenges the team has run into at the site, Maggie offers a typical answer: “Weeds.” She adds, “Any time you’re trying to take a piece of land and modify the vegetation, weeds are a challenge.” Drought, too, has introduced some hurdles for the site to clear, as much as Maggie notes that “Drought in the west is ongoing, and normal to a degree.”
Despite the challenges, Maggie says, “It was especially neat to uncover what this site holds that had been obscured by previous vegetation. When we eliminated the weed pressure from a lot of the rhizomatous, introduced grasses—grasses that almost creep and grow quickly across a piece of land—we found a strong native seed bank and bulb bank at the site. This included a field of camas, which is a culturally important plant in the region.”
Additionally, the site boasts co-benefits unique to pollinator-friendly solar farms—honeybee hive hosting, native seed collection, and research, too. “This site in particular has a local beekeeper, John Jacob, on site who has expressed an appreciation for the late season forage that the site provides.” Jacob, owner and founder of Old Sol Apiaries and former president of the Southern Oregon Beekeepers Association, determined that Eagle Point would be an ideal location for his honeybee hives, and an agreement with Pine Gate ensured that Jacob could place a few dozen hives on the perimeter of the farm.
The shade from the site’s solar panels increased the abundance of flowers under the panels and delayed the timing of their bloom, which provides forage later into the season, Maggie says. She adds, “The native seed collection is especially unique—it’s wonderful to have enough seed production at one site to help support other ecological restorations. We’re fortunate to benefit from Pine Gate’s willingness to use this site for repeated research projects. This is one of four that I know is happening at Eagle Point.”
As discussed in the first PV-SMaRT case study on Connexus Energy’s Minnesota site, when engineers and researchers sit down to plan out or conduct analyses on clean energy developments like solar farms, they often utilize something called a design storm to test how well the site will hold up against an extreme weather event like a flood. A design storm is a test flood event of a certain magnitude—the higher the magnitude, the more intense the test storm. These tests help researchers and engineers to model and analyze rainfall and soil moisture, as well as to determine how fast excess water soaks into the ground during extreme storms.
Jake Galzki, a researcher with the University of Minnesota who is part of the modeling team for the PV-SMaRT project, says, “The Eagle Point site is the heaviest clay soil in the study, which is generally associated with lower infiltration rates. However, this site has a deeper crop rooting depth than some of the other sites, and Hydrus modeling showed slightly more infiltration than the shallower soils in the study. Approximately half of the 100-year design storm was infiltrated in the model simulations.”
Aaron Hanson, Energy Program Specialist at the University of Minnesota’s Institute on the Environment, says, “A key outcome of this project was to provide clarity on how solar farms and select ground cover impact storm water runoff at large-scale developments. This site is providing key insights to our model that in turn will help the solar industry, state and local governments, and communities understand the impacts and make better decisions.”
Based on the field research and modelling completed on this site and the other four sites across the country—New York, Georgia, Minnesota, and Colorado—the University of Minnesota team has also developed a stormwater runoff calculator. The modeling results from the calculator demonstrate that, under most site conditions, if soils are not compacted and deep-rooted vegetation is established, solar farms result in significant decrease in runoff compared to agricultural land uses. The calculator will be publicly available for use by local and state regulators, solar industry contractors and developers, and water quality advocates. GPI is modifying the interim best practice guide completed last fall to accompany the calculator and reflect the final modeling results.
Project Site Benefits
In the eyes of the project’s core team, the Eagle Point site presents some specific observations on another key aspect of the PV-SMaRT project’s focus: permitting. For reference, the federal government generally delegates administration of stormwater permitting, required under the Clean Water Act, to individual states. While based on a common foundation, state stormwater permitting processes will always reflect each state’s unique ecosystems and water quality priorities; therefore, solar projects must adapt to these differences.
Remarking on that adaptation process at the Eagle Point site, Brian Ross, vice president and project lead at Great Plains Institute says: “The Eagle Point site in Oregon gives us a West Coast example to demonstrate the national implications of the scientific findings, best practices, and final runoff calculator. Each state interprets the Clean Water Act regulations somewhat differently and looking at the Eagle Point site further demonstrates the applicability of the science across different regulatory and permitting regimes.”
Stakeholder Feedback and What’s Next
Like the other PV-SMaRT sites, data and observations from the Eagle Point site now serve as a benchmark as the project’s research team continues to gather insight about each of the five project sites across the country. Ongoing findings at the Eagle Point site further validate the project’s recommended best practices for solar developments and stormwater management: It is possible to help lower the soft costs of clean energy development and of ongoing maintenance, protect the host community’s surface and ground waters, create needed habitat, and sequester carbon in the soil, all while helping craft a sustainable clean energy future that will benefit everyone for generations to come.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2022/09/Picture1.jpg203360Carl Berntsenhttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngCarl Berntsen2022-09-26 08:30:482022-09-26 08:30:49Case Study: Oregon’s Planet- and Pollinator-friendly Solar Site
“A company called AkoFresh is providing solar-powered refrigerated storage that it says extends the shelf life of perishable crops from about 5 days to 21 days. This will boost seasonal income for farmers by more than $10 million, as well as reduce greenhouse gas emissions by 15%. Farmers can rent a space in the cold store for a daily fee of $0.30 per 20-kilogram crate of produce or take up a weekly subscription. They can also pay for the cold storage with crops instead of cash.” – World Economic Forum
Research Being Conducted at Pennsylvania Agrisolar Site
“In recent years, the environmental management of solar farms has become an exciting area of academic research, to assess how different practices affect the productivity of solar and agricultural enterprises and the land on which they operate. Two studies seeking to answer research questions around these topics are currently underway at Lightsource bp’s Nittany 1, 2 and 3 solar projects in Pennsylvania.
All three sites were designed and are being actively managed to boost biodiversity and support pollinator populations, in addition to generating clean energy for Penn State and their students. Lightsource bp seeded the sites with a mix specifically formulated by the American Solar Grazing Association (ASGA), in partnership with Ernst Conservation Seeds and Pollinator Service. The seed mix, aptly named ‘Fuzz and Buzz,’ was designed to support pollinator species at solar sites, in addition to flocks of sheep. At Nittany 1, more than 700 sheep are managing vegetation through rotational grazing, an example of agrivoltaics, or co-located solar and agriculture.” – Lightsourcebp
New Zealand Solar Farm Will Host Sheep
“Harmony Energy New Zealand has been granted approval to develop a solar farm in the Waikato which will generate electricity to power 30,000 homes as sheep graze underneath. The Environmental Protection Authority (EPA) has approved Harmony’s proposal for approximately 330,000 solar panels to be installed on 182 hectares of a 260-hectare site at Te Aroha West. The land will remain in the ownership of Tauhei Farms Limited, with livestock grazing continuing with sheep, rather than the current dairy herd.” –https://www.stuff.co.nz/business/300693453/hauraki-solar-farm-that-could-power-30000-homes-gets-green-lightPower Technology
https://www.agrisolarclearinghouse.org/wp-content/uploads/2022/05/agrisolar-roundup-photo-scaled.jpg25602378A. J. Pucketthttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngA. J. Puckett2022-09-22 09:20:142022-09-22 09:20:14AgriSolar News Roundup: Agrisolar Refrigeration, Pennsylvania Agrisolar, New Zealand Agrisolar Development
Two new reports funded by the U.S. Department of Energy Solar Energy Technologies Office highlight the potential for successfully and synergistically combining agriculture and solar photovoltaics technologies on the same land, a practice known as agrivoltaics. One report details the five central elements that lead to agrivoltaic success, while the other addresses emerging questions for researchers related to scaling up agrivoltaic deployment, identifying barriers, and supporting improved decision-making about agrivoltaic investments. Learn more about the reports’ findings.
According to InSPIRE research, there are five central elements that lead to agrivoltaic success:
Climate, Soil, and Environmental Conditions – The location must be appropriate for both solar generation and the desired crops or ground cover. Generally, land that is suitable for solar is suitable for agriculture, as long as the soil can sustain growth.
Configurations, Technologies, and Designs – The choice of solar technology, the site layout, and other infrastructure can affect everything from how much light reaches the solar panels to whether a tractor, if needed, can drive under the panels.
Crop Selection and Cultivation Methods, Seed and Vegetation Designs, and Management Approaches – Agrivoltaic projects should select crops or ground covers that will thrive in the local climate and under solar panels, and that are profitable in local markets.
Compatibilityand Flexibility – Agrivoltaics should be designed to accommodate the competing needs of solar owners, solar operators, and farmers or landowners to allow for efficient agricultural activities.
Collaborationand Partnerships – For any project to succeed, communication and understanding between groups is crucial.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2022/08/IMG_3980-1.jpg509678Carl Berntsenhttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngCarl Berntsen2022-08-22 08:34:432022-08-22 08:43:41New Reports Highlight Best Practices of Combining Solar Energy and Agriculture
Helping people build resilient communities through local and sustainable solutions that reduce poverty, strengthen self-reliance, and protect natural resources.
To learn more about NCAT and its mission, please visit: WWW.NCAT.ORG.
This material is based upon work supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under the Solar Energy Technologies Office Award Number DE-EE0009372.
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