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.
The Foundational Agrivoltaic Research for Megawatt Scale (FARMS) funding program will advance agrivoltaics practices and show how it can provide new economic opportunities to farmers, rural communities, and the solar industry. They explore different ways to implement agrivoltaics that will address concerns from the solar industry and farmers. Currently, less than 2% of solar systems utilize agrivoltaic practices.” – Energy.gov
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
In this article, researchers argue that the divide between food and energy production groups can be lessened with the co-generation of food and energy on the same land. This paper demonstrates the importance of different light spectra, and show that those spectra, if optimized in terms of their utilization, could lead to sustainable and more efficient food and energy systems.
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 Adair2022-12-08 11:24:592022-12-08 11:25:00Not All Light Spectra Were Created Equal: Can We Harvest Light for Optimum Food‐Energy Co-Generation?
This research was conducted to investigate the roasting capacity of a batch-type directly solar radiated roasting system for the decentralized processing of coffee using solar energy. Experimental results revealed that the roaster was capable of roasting a batch of 2 kg coffee beans in 20, 23, and 25 minutes subjected to light roasts, medium roasts, and dark roasts, respectively. The payback period of the solar roaster unit was estimated to be 1038 working sunshine hours, making it viable for commercialization.
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 Adair2022-12-08 11:16:232022-12-08 11:16:24Development and Experiments on a Batch-Type Solar Roaster—An Innovative Decentralized System for Coffee Roasting
This research details the design of a solar coffee roaster in rural Peru, and presents the result of experimental roasts. Researchers also discuss future improvements that could be made to the design.
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 Adair2022-12-08 11:05:292022-12-08 11:05:30Design of a Solar Coffee Roaster for Rural Areas
This paper applied an open-source spatial-based model to quantify the solar power generation (the ground-mounted photovoltaic panels) for the southern regions of Poland and Ukraine. Researchers then compared economic indicators of the solar power generation and the crop production projects for rain-fed land. The analysis revealed that the PV projects have higher net present value, but lower profitability index compared to the crop production.
The main goal of this research was to find optimal management strategies for sheep flocks kept on solar arrays. Researchers studied flock health and productivity parameters, as well as forage production and quality in a multi-year colloborative trial on a 54-acre solar array adjacent to Cornell University campus. The study concluded that stocking densities of 12, 16, and 20 sheep per acre were successful in maintaining the vegetation within solar arrays, while grazing densities between 12 and 16 sheep per acre may be more complementary for flock health and condition.
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 Adair2022-12-08 10:29:082022-12-08 10:29:10Effect of Stocking Rate on Forage Yield and Vegetation Management Success in Ground Mounted Solar Arrays Grazed by Sheep
Researchers in this study monitored soil and air temperature, humidity, wind speed, and incident radiations at a full sun site, as well as at two agrivoltaic systems with different densities of photovoltaic panels. They recorded the findings during three seasons (winter, spring, and summer) with both short cycle crops (lettuce and cucumber) and a long cycle crop (durum wheat). The researchers concluded that little adaptations in cropping practices should be required to switch from an open cropping to an agrivoltaic cropping system and attention should mostly be focused on mitigating light reduction and on selection of plants with a maximal radiation use efficiency in these conditions of fluctuating shade.
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 Adair2022-11-29 08:50:132023-08-16 11:09:47Microclimate Under Agrivoltaic Systems: Is Crop Growth Rate Affected in Partial Shade of Solar Panels?
Researchers in this study used experimental panels to simulate the effects of solar development on microhabitats and annual plant communities present on gravelly bajada and caliche pan habitat, two common habitat types in California’s Mojave Desert. They evaluated soils and microclimatic conditions and measured community response under panels and in the open for seven years. The study’s results demonstrate that the ecological consequences of solar development can vary over space and time and suggest that a nuanced approach will be needed to predict impacts across desert landforms differing in physical characteristics.
At Far Niente Winery, respecting the land and all it provides is just second nature. Since 1979, their winemakers have been coaxing award-winning wines out of the grapes grown on their Napa Valley estate, but in 2005 began embracing their role as environmental stewards through their sustainability practices related to farming, winemaking, and renewable energy generation. Located on the Martin Stelling Vineyard in Oakville, Far Niente’s floatovoltaic system is at the forefront of the winery’s commitment to those sustainable practices and ethical winemaking.
When Far Niente decided to go solar, they faced challenges both unique and common to the agricultural world. Where many businesses may have chosen to place panels on the roof of their buildings, Far Niente’s old stone winery building is on the National Register of Historic Places, making it impossible to do so without violating regulations. Installing ground-mounted panels immediately around the heritage building was not an appealing solution either. After doing the math and realizing they would need to install over 2,000 panels to hit their energy production goal, they were faced with a tough choice: remove established cabernet sauvignon vines or get creative and take a risk. “Taking two acres out of cabernet production really hurts,” says winemaker Greg Allen. “By looking to the pond, it allowed us to maximize how many grape vines we were able to keep and still meet our goal.” These challenges ultimately culminated in the decision to build the world’s first grid-connected floating solar array, despite the lack of real-world success stories of floatovoltaic arrays at the time.
Developed by Thompson Technology Industries and installed by SPG Solar, the ambitious project went live in April 2008. A total of 1,000 Sharp 208 polysilicon panels were installed over the vineyard’s pond, covering just shy of a full acre. The panels rest atop pontoons anchored to the pond’s banks via marine-grade cabling attached to concrete columns. This setup allows the pontoons to rise and fall with changing water levels throughout the year. Rounding out the vineyard’s solar system are 1,300 ground-mounted panels adjacent to the pond. The system was originally installed with a 500-kilowatt central inverter, but that was replaced after 10 years with 12 SolarEdge string inverters. Together at peak output, the arrays generate roughly 407 kilowatts total with about 177 kilowatts coming from the floatovoltaic system alone.
Unsurprisingly, building such a system comes with a substantial financial commitment. The project’s total cost was $4.2 million upon completion, with an estimated payback period of 12 to 15 years. Fortunately, the net cost for Far Niente was significantly less, thanks to a $2.80/kW self-generation cash rebate from Pacific Gas & Electric, as well as a 30% federal tax incentive and accelerated depreciation tax benefit. The winery worked with Banc of America Leasing and Capital on a seven-year lease as well, which included a buyout option that would allow them to be the sole owners of the system. Far Niente did opt to purchase the array at the end of the seven years, and reports that the system paid for itself at around year 14 of operation.
With all the energy generated by the system, the winery is able to cover about 80% of its annual energy requirements, but that is far from the only benefit. The floatovoltaic array saves almost a full acre of viable land from being sacrificed for additional ground-mounted panels. Since this part of the vineyard is foundational to the winery’s cabernet sauvignon program, all that preserved space equates to thousands of dollars of bottled cabernet sauvignon revenue saved each year.
Additionally, there’s reason to believe that the panels’ positioning on top of the pond leads to increased efficiency when compared to the ground-mounted panels. Greg Allen has taken the surface temperature of the panels and found that those on the floating array can measure up to 5 degrees Fahrenheit cooler than their land-based counterparts. Because photoelectric conversion improves in cooler environments, keeping the solar panels at a lower temperature will increase the energy production efficiency when compared to the warmer panels on land.
A further boon to resource management is the array’s potential to reduce evaporation rates — a crucial win for a vineyard operating in an area seeing increasingly higher temperatures and more frequent drought conditions. While Greg notes that there is no completed study yet, he says, “In my mind, I think that the panels decrease the amount of evaporative loss from the pond.” He adds that it is difficult for the winery to quantify the potential amount of water saved, since there are systems both pulling water from and pushing water to the pond at various times. Currently, the pond serves the winery in several capacities, including as a fire- and frost-protection system, irrigation source, and as the recipient of all process wastewater from the winemaking facility. Three wells intermittently feed the pond, as well. Greg states that there is an ongoing research partnership between the winery and University of California Davis that will hopefully shed light on the shading and water conservation benefits, as well as the ecological impacts of the array.
When reflecting on the challenges the project presented, Greg says “Interconnection [to the grid] was a big one.” In order to meet their energy production goals, the entire system needed a 500-kilowatt inverter. The winery hit a roadblock with the project when they realized the main service transformer for the winery was only half that size. Far Niente’s utility provider requires that the main service transformer must be able to accommodate 100% of the energy produced by a solar system. “That spawned a massive project of its own,” Greg says, since the winery then had to replace their transformer to match the power rating of the inverter before they could bring the array online.
As the system approaches 15 years of use, they are noticing more individual panel failures. Greg says that the panels installed in 2007 are no longer commercially available to replace the failed panels, but there is a silver lining. He estimates around five more years of operation with their current set up, and then the winery could begin to look at the possibility of a major system overhaul. Over a decade of research and development has greatly increased the efficiency of today’s panels, providing the possibility of cutting their solar array footprint in half while maintaining the amount of energy produced on-site. “We could regain substantial amounts of vineyards,” he says. Should the winery choose to overhaul their entire system in such a way, the future revenue from the potentially recovered vineyard space could fund the cost of the improved system.
Looking back, Greg says a big challenge has been on the operations and maintenance side of owning the arrays. “Our main job is making and selling wine, and suddenly we’re put in the position of having to – on a daily basis – verify that the system is functioning and then initiate troubleshooting” when it’s needed. He points out that in the beginning, no one at Far Niente was an expert at what essentially became running a small power plant, but they had to develop that expertise in order to keep the system operating. With the possibility of a new system installation on the horizon, Greg speculates that partnering with a third party on a power purchase agreement could be an ideal solution for Far Niente. A power purchase agreement is an arrangement that allows a solar developer to install, operate, and own a system on a customer’s land. The customer is then able to purchase the electricity generated by the system directly from the developer, often at reduced rates. “It means that we would have on-site generation of renewable energy that we use,” he says, “and we would rely on the experts to maintain the system while we focus on growing grapes and making phenomenal wine.”
No decisions have been made yet as to whether Far Niente will pursue upgrading their system or move towards a power purchase agreement. Regardless of what path the winery will take in the coming years, Greg says they are really pleased with their decision to pursue onsite renewable energy generation and the overall performance of the solar arrays over the years. In particular, the winery’s ownership and staff have enjoyed being pioneers in the field of floatovoltaics. Far Niente’s years of renewable energy generation serve as an excellent example of how solar energy production can support a company’s efforts to implement sustainable measures while existing in harmony with agricultural operations.
https://www.agrisolarclearinghouse.org/wp-content/uploads/2022/11/Far-Niente-Panels-scaled.jpg17142560Anna Adairhttps://www.agrisolarclearinghouse.org/wp-content/uploads/2022/02/AgriSolar_stacked_1-338x400.pngAnna Adair2022-11-28 14:17:402024-10-17 12:28:17Case Study: Far Niente Winery
This study presents data for a techno-economic price-performance ratio calculation retrieved from an inter- and transdisciplinary agriphotovoltaic case study in Germany.
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 Adair2022-11-28 10:27:092024-06-04 08:54:54Implementation of Agrophotovoltaics: Techno-economic Analysis of the Price-performance Ratio and its Policy Implications
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