Tag Archive for: AgriSolar

AgriSolar News Roundup: Aquavoltaics in Taiwan, AgriSolar in Italy, National Pollinator Week Recognized

Aquavoltaics to be Developed in Taiwan by 2023 

“UK solar specialist Lightsource is developing a 150 MW solar park at a fishery in Budai, in Taiwan’s Chiayi County. Construction is expected to commence in June 2023. The company is co-developing the project with Germany’s Green Rock Energy. They plan to start construction on the facility in June 2023. Lightsource said the project will be one of the largest fishery solar farms in Taiwan and will be able to generate 210,000 MWh per year.” – PV Magazine Global 

Farmers Could Become Energy Exporters in Italy 

“Italy wants the European Union to allow farmers to sell surplus electricity they generate on their land, a measure that could help soften a bloc-wide energy crunch. “Italian agricultural companies have huge surfaces available that should be filled with solar panels,” Agriculture Minister Stefano Patuanelli said in an interview Monday, referring to the roofs of stables, granaries and sheds. 

Solar sharing – which involves using farmland for producing crops as well as generating power – has gained traction in recent years, as farmers have sought to cash in on a renewable project boom. It is also not uncommon for them to lease their land and be paid indirectly, without owning the project.” – Bloomberg  

National Pollinator Week Recognized  

“Agriculture Secretary Tom Vilsack issued a United States Department of Agriculture (USDA) proclamation in recognition and support of National Pollinator Week (June 20-26, 2022). Pollinator species, such as bees, other insects, birds, and bats play a critical role in producing more than 100 crops grown in the United States. Honeybee pollination alone adds more than $18 billion in value to agricultural crops annually. USDA recognizes the critical role pollinators play in agriculture and supports pollinator health through research, data collection, diagnostic services, monitoring, pollinator habitat enhancement programs and pollinator health investments.” – USDA 

Manzo Elementary School Solar Garden

Manzo Elementary School, located in Tucson, Arizona, is a Flagship School for the University of Arizona Community and School Garden Program and a fellow agrivoltaic site to Biosphere2. The school has had an award-winning ecology program for over a decade, which includes a garden and hen house cared for by the students as a way of learning. In 2015, the school erected a 193-kW (600 PV panels) solar PV array as a part of the Tucson Unified School District Solar Program. This system produces approximately 490-500 MWh per year.

The Manzo Solar Array

Working with Greg Barron-Gafford from the University of Arizona, the school installed a small garden under the panels and an unshaded control garden to the west of the panels. Plants range from potatoes to tomatoes, basil, beans, and squash. The research on this site is similar to Biophere2 in that they study phenology, soil health, water consumption, and greenhouse gas consumption. Graduate students typically study both sites for a comprehensive thesis.

Harvested food grown in the solar garden at Manzo School. Photo: Mariah Rogers, University of Arizona

What makes this site unique is the participation of the Manzo’s students, who take part in the studies by assisting with planting, caring, watering, and harvesting the fruits and vegetables. Once harvested, the food goes to the Food Literacy Program, located in the Manzo cafeteria, so the students can then learn how to wash, prep, and cook the food they grew. Research at the school show similar results to Biosphere 2. A key finding in this research proved that solar garden plants need less watering. This is important for farming in Arizona, where temperatures can reach well over 100oF and water sources are slowly being depleted. Research also found that seeding can take place earlier due to the cooler temperatures under the panels, allowing for a possible second planting and increased production. The solar garden plants can flourish in extreme weather because they are shaded during the hottest times of the day.

Overall, Greg Barron-Gafford and his graduate students are proving that solar and farming can co-exist to benefit landowners and farmers alike. The research being conducted at both Manzo School and Biosphere2 will have positive impacts on the co-existence of solar production and desert farming.  

Under the panels at Manzo Solar Garden
Berries under the panels at Manzo Solar Garden

Massachusetts Farm Partners with BlueWave in Dual-Use Solar

The Knowlton Farm, a Massachusetts agrisolar operation, has recently partnered with BlueWave Solar to expand agrisolar operations on the farm in Grafton, according to an article by The New York Times.  

Owner Paul Knowlton stated that the farm typically produces a variety of vegetables, dairy products, and hay, but also produces solar energy. He said that solar was already part of the farming operations, providing electricity for both his barn and home, but through this partnership with BlueWave, the farm will include a parcel of land where solar panels will share space with crops, known as dual-use solar, according to the report. 

The dual-use solar operation includes adjusting the heights of solar panels to allow farm operations, including workers, equipment, and grazing animals, to operate underneath them. Spacing and angles of the solar panels are adjusted to benefit crops growing below them—shielding them from the elements, including intense heat. Some of the panels will have cattle grazing beneath them while others will grow butternut squash and lettuce. 

The AgriSolar Clearinghouse will be touring the Knowlton Farm on August 10, 2022, as part of the Follow the Sun Tour. The tour is a series of hands-on field trips to see firsthand the benefits of co-locating sustainable agriculture and solar energy. Other locations on the tour include the Massachusetts Amherst South Deerfield research site and the Million Little Sunbeams family farm. 

US Solar Partners with T-Mobile on Minnesota Solar Gardens

US Solar and T-Mobile have partnered on 14 Solar Community Gardens in Minnesota. T-Mobile’s sunscription to US Solar’s Community Solar Garden means the company will benefit from local solar without upfront costs and equipment. The energy-cost savings will apply to seven Minnesota counties.  

Erica Forsman, Vice President of Origination at US Solar, stated, “We’re focused on providing solutions to our commercial partners that make it simple and beneficial to support local clean energy. We are excited to partner with T-Mobile and provide a renewable energy solution to support their industry-leading sustainability goals in Minnesota and across the nation,” according to Businesswire. 

US Solar also partners with Excel Energy, not only operate over 120MW of renewable energy to their grid but has implemented AgriSolar operations by planting pollinator-friendly vegetation on those sites. This pollinator-friendly vegetation on solar sites reduces stormwater runoff, enhances soil regeneration, and increases air quality in surrounding communities.   

Three of the Minnesota Community Solar Gardens began operation in late 2021, and the other 11 are in various stages of development and construction. In early 2021, T-Mobile became the first telecom to achieve their RE100 commitment to source 100% of their electric usage from renewable energy.     

Learn more here. 

Techno Economic Modeling for Agrivoltaics: Can Agrivoltaics be more profitable than Ground mounted PV?

Agrivoltaics is a dual land-use approach to collocate solar energy generation with agriculture for preserving the terrestrial ecosystem and enabling food-energy-water synergies. Here, we present a systematic approach to model the economic performance of agrivoltaics relative to standalone ground-mounted PV and explore how the module design configuration can affect the dual food-energy economic performance. A remarkably simple criterion for economic feasibility is quantified that relates the land preservation cost to dual food-energy profit. We explore case studies including both high and low value crops under fixed tilt bifacial modules oriented either along the conventional North/South facings or vertical East/West facings. For each module configuration, the array density is varied to explore an economically feasible design space relative to ground-mounted PV for a range of module to land cost ratio (𝑴𝑳) – a location-specific indicator relating the module technology (hardware and installation) costs to the soft (land acquisition, tax, overheads, etc.) costs. To offset a typically higher agrivoltaic module cost needed to preserve the cropland, both East/West and North/South orientated modules favor high value crops, reduced (<60%) module density, and higher 𝑴𝑳 (>𝟐𝟓). In contrast, higher module density and an increased feed-in-tariff (𝑭𝑰𝑻) relative to ground-mounted PV are desirable at lower 𝑴𝑳. The economic trends vary sharply for 𝑴𝑳< 10 but tend to saturate for 𝑴𝑳> 20. For low value crops, ~15% additional 𝑭𝑰𝑻 can enable economic equivalence to ground-mounted PV at standard module density. Researchers have presented a techno-economic modeling framework to assess and predict the economic performance of 𝐴𝑉 systems relative to the standard ground mounted 𝑃𝑉. The effects of module design configurations including array density and orientation, income from crop, technology specific and land related costs, and 𝐹𝐼𝑇 are explored. To support cropland preservation, 𝐴𝑉 typically has a higher module technology cost as compared to standard 𝑃𝑉 primarily due to elevated mounting and customized foundations that can potentially make it economically non-attractive for 𝑃𝑉 investors. They show that it is possible to design an economically attractive 𝐴𝑉 system by selecting suitable crops and module configuration for the given land costs and 𝐹𝐼𝑇.



Techno Economic Modeling for Agrivoltaics

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Agrivoltaic Systems Enhance Farmers’ Profits through Broccoli Visual Quality and Electricity Production without Dramatic Changes in Yield, Antioxidant Capacity, and Glucosinolates

This paper shows that agrivoltaic systems allow us to reach sustainable food and electricity goals with high land-use efficiency. The study shows the yield, antioxidant capacity, and secondary metabolite of broccoli and electricity production were analyzed under an agrivoltaic system over three cultivation periods. The study also reports that agrivoltaic with additional shading treatment produced greener broccoli with a higher level of consumer preference than open-field grown ones.

 



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AgriSolar News Roundup: Solar Leasing Guidebook and Workshops, Maryland Solar Bills, Australian AgriSolar

American Farmland Trust Announces Guidebook and Workshops for Solar Leasing 

American Farmland Trust, a stakeholder in the AgriSolar Clearinghouse, has announced they will offer virtual and in-person workshops designed to help ranchland and farmland owners understand the emerging solar-development field. 

“Solar energy development is accelerating rapidly in our region, and what we’re seeing is that farmland and rangeland owners are on the frontlines of this trend,” says Addie Candib, AFT Pacific Northwest Regional Director. “Many communities are wrestling with the question of whether – and where – solar should be built, but at some point, it will be up to the individual landowner to decide what’s in the long-term best interests for their business and their families. That’s what this project is about – helping farmers and ranchers to make informed decisions about the future of their land.” – American Farmland Trust 

Pair of Community Solar Bills Passes in Maryland 

“The Maryland legislature has taken steps towards strengthening its ongoing community solar pilot program, passing a pair of bills targeted at increasing the amount of eligible projects, and increasing the incentive for such projects to be developed. HB 1039 and HB 440 create tax incentives for the development of agrivoltaic community solar projects which serve low- and moderate-income customers on rooftops, brownfields, landfills, and clean fills, as well as increasing maximum project capacity to 5 MW. The bills both build on regulatory action from 2021, which expanded the program to allow community solar to power the equivalent of an additional 6,840 Maryland homes, while also allowing community solar projects to be built on clean-fill construction sites, transforming previously unusable industrial locations into clean solar energy generation sites.” – PV Magazine 

Australian Solar Park will Host Crops in New AgriSolar Program 

“Italy’s Enel will launch an experimental agrivoltaics program at its 34 MW Cohuna Solar Farm in the Australian state of Victoria to help formulate a ‘best practices’ template for utility-scale solar PV sites in other countries. Enel Green Power Australia, a subsidiary of Italian energy giant Enel, will explore how to combine solar PV generation and agricultural production in a new research program to be undertaken at its Cohuna Solar Farm in northern Victoria. Much of the land near the Cohuna Solar Farm is home to sheep grazing operations. While ‘solar grazing’ is proving to be a popular form of land co-use for large-scale solar, other forms of agrivoltaics are emerging that support horticulture, viticulture, aquaculture and even cropping activities.” – PV Magazine 

Characterizing the Ecological Effects of Utility-scale Photovoltaic Arrays in Rangeland

By Dr. Seeta Sistla, Natural Resources Management and Environmental Sciences Department, Cal Poly, San Luis Obispo

With the dual growth of utility-scale solar energy and food production, fallowed agricultural landscapes represent a particularly promising area for the deployment of solar arrays because these systems have the potential to recover with shifts in management practices (Tscharntke et al., 2012;  Wright et al., 2012). California is a national leader of both solar energy development and agricultural production. As water becomes scarcer and costlier, there is growing tension between land-use choices centered around maintaining conventional agricultural systems, transitioning land to renewable energy farming through solar energy development, shifting agricultural strategy (e.g., conventional to conservation farming), or alternate land uses (e.g., housing development).

Placing solar arrays on farmland and other human-modified landscapes represents a promising area to unite energy production with ecological restoration and the sustained conservation of ecologically valuable land. The potential for ecologically improving degraded landscapes with targeted solar array placement will be governed by biogeochemical interactions between abiotic and biotic factors (Figure 1).  Despite the potential ecological and economic synergistic benefits that coupling these land uses could create, the impacts of solar arrays on fallowed farmland and other disturbed landscapes are not well understood.

Figure 1. Microclimatic effects of USSE array on fallowed agricultural landscapes.

To address this deficit, we are studying the direct and indirect effects of utility-scale solar energy in conjunction with sheep grazing on soil and plant characteristics. This work includes collaborating with agricultural stakeholders, undergraduate and graduate students, and solar developers (Figure 2).

Figure 2. Sampling plant and soil conditions at a solar farm on the California Central Coast.

To date, we have found that land in the direct footprint of the array panels hosts a plant community with increased nutrient content and forage quality and maintains a greener plant community for longer periods than the surround area.  These findings likely reflect reduced water stress due to shading in our arid western landscapes, highlighting the potential synergy between carbon-free energy production, rangeland management, and water conservation (Figure 3). Our group continues to investigate these plant and soil responses to array placement at two solar sites on the Central Coast of California and looks forward to opportunities to collaborate with others.

Figure 3. Sheep grazing within one of our solar array study sites. Note the shift in vegetation greenness beyond the array area.

References

Tscharntke, T., Y. Clough, T. C. Wanger, L. Jackson, I. Motzke, I. Perfecto, J. Vandermeer, and A. Whitbread. 2012. Global food security, biodiversity conservation and the future of agricultural intensification. Biological Conservation 151:53–59.

Wright, H. L., I. R. Lake, and P. M. Dolman. 2012. Agriculture-a key element for conservation in the developing world. Conservation Letters 5:11–19.

AgriSolar News Roundup: Pastureland, Australian Grazing Quality, Regenerative Energy

Pastureland: Solar Panels and Sheep 

“Grazing by sheep and other livestock joins other dual uses: planting groundcover to benefit pollinators, growing marketable plants such as cherry tomatoes and lavender under the panels, installing beehives, and maximizing soil health practices to improve the land for later ag use. The use of solar sites for livestock grazing is still in its infancy, but flocks of sheep are already grazing contentedly under and around glass panels in Pennsylvania, Virginia, Maryland, and New York. By welcoming the grazers, solar operators save money on land maintenance. After the cost of leasing the land, vegetation management is often their top expense.” – Bay Journal 

Solar Panels Increase Australian Grazing Quality During Drought 

“Two agrivoltaic installations in New South Wales, Australia, are being credited with increasing the quantity and quality of fleece in sheep grazing at the facilities during a drought. Research has indicated that the partial shade offered by solar panels creates a microclimate that reduces evaporation and significantly boosts the production of vegetation in arid climates. Researchers found that areas that were partially or fully covered by solar panels increased their biomass production by 90%.” – PV Magazine 

Silicon Ranch’s Regenerative Energy Program  

“Silicon Ranch founded a branch of its company dedicated to regenerative land management practices nearly four years ago and has found that a forward-looking, natural approach to solar project planning is proving fruitful in the long term. To address degraded soils and topsoil regeneration, Regenerative Energy gathers a seed mix of grasses native to that respective region and re-seeds the site. Given the length of the solar development process, seeds are ideally sown at least one year ahead of construction. Newly rooted plants will reintroduce stability to that soil.” – Solar Power World 

Tasting the Fruits and Vegetables Grown Under Solar Panels

By: Mariah Rogers, Graduate Student, University of Arizona

Do plants taste different under solar panels? Do they taste better? At the Biosphere 2 Agrivoltaics Learning Lab, we studied just that.

Why Should We Use Agrivoltaics?

Agrivoltaics—the production of agriculture and solar photovoltaic energy on the same parcel of land—is gaining attention as farmers are facing new struggles amid the climate crisis. With agrivoltaics, farmers can reduce water consumption, produce renewable energy, and continue to cultivate their land. However, there is skepticism toward growing crops under solar panels, as farmers may have to change the types of plants that are more shade tolerant.

The Biosphere 2 Agrivoltaics Learning Lab

At the Biosphere 2 Agrivoltaics Learning Lab (B2AVSLL), we study the microclimate—that localized environment under the solar panels— and how plant adaptations occur in the shade of the agrivoltaic system. Some of the adaptations that plants make in the agrivoltaic microclimates include differences in yield, changes to plant morphology (leaf size, fruit shape and color), and alterations in metabolites. These adaptations may cause differences in how people perceive these crops. To study these differences, we grow a slew of different crops underneath solar panels.

We grow tomatoes, basil, potatoes, beans, squash, and lavender, just to name a few. While some of the plants grown at B2AVSLL are heat tolerant, crops grown in this region of the U.S. still require a lot of water. With agrivoltaics, we can reduce water consumption and still have a good yield. So, it is in our best interest to figure out if they would be successful both for the environment and in the market.

The Study Goals

To understand how these crops would do in the market, we conducted a consumer sensory study at the University of Arizona. The three goals of the study were to: (1) to understand if people perceived a difference between agrivoltaic-grown crops vs. crops grown in full sunlight (control); (2) determine if people preferred agrivoltaic-grown crops compared to control; and (3) discover if people were willing to pay more for crops grown in agrivoltaic conditions.

A total of 105 people participated in the study. Panelists were subjected to different conditions and samples, based on the site and the day they were tasting samples. Tomato and basil, potato and bean, and potato and squash were tasted by panelists.

Does Agrivoltaics Change the Flavor of Plants?

To understand if there was a difference between agrivoltaic- and control-grown samples, we used a triangle test where participants were given three samples with a random three-digit code; two of the samples were the same and one was different. We then asked the participants to pick which sample was the “odd one out.”

So, did agrivoltaics change the flavor of the crops? Yes and no. Tomato, bean, and squash samples (all fruits) were perceived as different by tasters. Basil and potato samples were not perceived as significantly different by tasters.

Does Agrivoltaics Make Plants Taste Better?

To understand if there was a preference between samples from the two growth conditions, we then conducted a paired preference test. We gave tasters two samples with random three-digit codes and asked if they preferred one sample more than another, or if they preferred neither sample.

Unsurprisingly, the results were mixed. People significantly preferred beans grown in the control setting over those grown in agrivoltaics. In addition, agrivoltaic-grown basil, potato, and squash samples were preferred by tasters.

Are People Willing to Pay More for Agrivoltaic-grown Produce?

After the triangle and preference tests, we asked participants if they would be willing to pay more or less for their favorite samples. Overall, we found that participants were willing to pay the same or more for all samples after they knew that their favorite samples were grown in agrivoltaic systems.

What Does This Mean for Farmers and Investors?

Because consumers can’t tell a significant difference in vegetable samples, and they preferred basil, potato, and squash, it may be in farmers’ best interest to grow these crops, especially in the desert. By marketing the produce as grown under solar arrays, and educating consumers about agrivoltaics, farmers may be able to sell their produce for slightly more at farmers markets.

What Does This Mean for You as a Consumers?

Buying for foods that are grown using agrivoltaics means supporting solar energy generation through purchasing fruits or vegetables. If you already go to the farmers market to buy fruits and vegetables, you may want to consider buying agrivoltaic-grown produce. If you want something that tastes like what you already buy from the farmers market, then you may want to buy vegetables. If you are looking for a different tasting product, you may want to buy fruits grown under agrivoltaics. You can be the judge whether you prefer one growth condition over another.