When farmer Trent Gerlach found out a solar farm would be built on the land he had long worked in northwestern Illinois, he was disappointed. 

“As a farmer, seeing that land taken out of production is difficult, when you farmed it for many years, you’ve been stewards to that land, fertilized that land, taken care of it as if it was your own,” he said. 

Gerlach’s family had been raising corn, soybeans and livestock since 1968, and like many farmers, they leased farmland in addition to working their own land. And when the owner of one of those leased parcels decided to work with Acciona Energia to help site its High Point wind and solar farm, Gerlach initially was not enthusiastic. 

“The thought of taking productive farm ground out of production with solar panels was not, in my personal opinion, ideal,” he said. 

But Gerlach was determined to make the best of the situation.

Ultimately, that meant a win-win arrangement, where Acciona pays him to manage vegetation around the 100 MW array of solar panels that went online in early 2024. Gerlach does that with a herd of 500 sheep. 

“We don’t own the land, we don’t get a say — that’s landowners’ rights, and I’m very pro that,” Gerlach recounted. “In U.S. agriculture, the biggest thing that gets farmers in trouble is saying, ‘that’s how we’ve always done it so that’s what we’re going to do.’ Renewable energy is probably not going anywhere, whether you’re for or against it, it’s coming, it’s what’s happening. As an agriculture producer, we’re going to adapt with it.” 

A promising arrangement

Researchers around the country are exploring agrivoltaics, or co-locating solar generation with agriculture in a mutually beneficial way. Projects range from growing tomatoes in California to wild blueberries in Maine, with varying levels of success.

Acciona regional manager Kyle Charpie said that sheep grazing appears an especially promising form of agrivoltaics, and one that the company is likely to continue exploring globally. Solar operators need to keep vegetation controlled, and sheep are a more effective and ecological way to do it than mechanized mowing. Acciona has long had a sheep agrivoltaic operation in Portugal, Charpie noted, and two projects in Texas are underway. 

“It’s incredibly cost-effective — sheep don’t break down like a tractor; if a tractor blows a belt, you’ve lost a whole day of cutting,” he said. “These grasses grow wickedly fast, it’s that constant presence of the sheep that’s been super super effective. It aligns with our sustainability goals.”

“It’s tough to say we’re the greatest renewable company in the world [if] we have a bunch of tractors running up and down our fields belching out CO2,” he continued. 

Another advantage, Charpie said, is that at the end of the solar array’s lifespan, the land beneath it will be restored and refreshed.

“We have all these sheep now who will spend 30-plus years breathing, living, using their hooves to churn up ground, even dying; it’s the circle of life,” he said. “When these farms get turned back to the families, that soil condition will be wonderful.” 

‘He saw an opportunity here’

Gerlach’s family had about 50 ewes when the idea for grazing around the solar panels struck. He “hounded” Acciona, in Charpie’s words, to bring an agrivoltaic deal to fruition.

“He saw an opportunity here, and he has been his own best advocate, banging down the door, checking how close are we, when will we get our sheep here,” Charpie said. 

Gerlach ultimately bought about 500 sheep of two types: Dorper and Katahdin, small breeds that can fit easily under solar panels. 

“The panels create lots of shade — during the heat of the day, they’ll all be underneath the panels for shade,” Gerlach said. “In early mornings, late evenings they’re out grazing aggressively. They don’t bother the panels one bit.”

Gerlach said his family “used to raise livestock like everybody did back in the day,” and his farm has won awards for its cattle, but raising livestock has become less profitable in recent years. Agrivoltaics offer an opportunity to delve back into raising sheep, something Gerlach loves. A commercial sheep operation would only be possible with the payments for vegetation management, he said.

“Raising sheep in the United States is challenging because the market for sheep is not very high,” he said. There’s not much of a domestic wool market, and “the meat side of sheep and lamb never really caught on in the U.S. — we’re a beef, pork, poultry-consuming country.” 

Gerlach sells the bulk of his lambs around the Easter season, and largely for kosher and halal consumption. Since that market is so limited, the ewes largely earn their keep being paid to graze.

“We love providing stewardship to the animals. That’s what U.S. agriculture was built on hundreds of years ago,” Gerlach said. “It marries really well with our crop production” on nearby land. “In agriculture you need diversification. By bringing sheep and livestock production in, we can afford to hire more full-time employees.” 

Sheep are the livestock best suited to agrivoltaics, stakeholders agree. 

“You can’t use cattle because they’re too large, they would rub on the panels and break them,” Gerlach said. “You can’t use goats because goats would climb on the panels, and they’re natural chewers, they would chew on the wires.” 

The High Point solar array is divided up into separate plots with fences, “like perfect little pens for the sheep,” added Charpie. 

In a bigger uninterrupted plot, a farmer would likely need to move water sources for sheep strategically around the area to make sure the animals cover the entire plot. Gerlach’s flock only grazes about a fifth of the Acciona solar array. He’s hoping to expand, though feeding and sheltering sheep during the winter when they can’t graze is costly. 

“I’ve got three young kids. Hopefully we raise them in agriculture. It’s such a good practice for our young people to learn responsibility and stewardship,” Gerlach said. 

“[The animals] come first, they get fed and watered and taken care of before us. Sometimes agriculture gets portrayed in a poor light, especially larger production agriculture. I try to really push that that’s not everybody. Talk to a local farmer, a local person — you generally see that we’re stewards of the land, we want healthy ground and livestock. That can marry in fine with clean energy.”

How a solar development turned from threat to opportunity for an Illinois farmer is an article from Energy News Network, a nonprofit news service covering the clean energy transition. If you would like to support us please make a donation.

Research underway at a Madison County solar farm promises to shed light on how well multi-use farming can work at a large scale. The answers will help shape best practices for future projects, while addressing some concerns raised in ongoing debates over siting large solar projects in rural farm areas.

Spread across more than 1,900 acres, the 180 MW Madison Fields project will be one of North America’s largest test grounds for research into agrivoltaics — essentially farming between the rows on photovoltaic solar projects.

As farmers seek to lease land for solar arrays to diversify their incomes, the practice could help them maximize their income and fend off opposition from critics concerned that solar development will take prime farmland out of production.

Some farmers have also said the revenue from clean energy can help keep their farms operating amid pressure from housing developers. A recent report from the American Farmland Trust says Ohio could lose more than 518,000 acres of farmland to urban sprawl by 2040.

That number dwarfs the roughly 95,000 acres for certified and other projects noted on the Ohio Power Siting Board’s most recent solar case status map. 

Yet solar projects generally deal with big chunks of land at once, while urban sprawl happens bit by bit over time, said Dale Arnold, director of energy policy for the Ohio Farm Bureau. Helping people understand and appreciate that is “absolutely huge,” he said.

Savion, a Shell subsidiary, developed the Madison County project, and it began commercial operation on July 11 with Amazon as the long-term buyer for its energy. Yet work began much earlier this year to set up the site for research by Ohio State University scientists, Savion’s Between the Rows subsidiary, and others.

“People have a lot of questions with regard to energy development going forward in this state,” particularly when it comes to taking land out of use for agricultural production, Arnold said.

Yet today’s industry continues to shift away from coal to a diversified portfolio of natural gas, nuclear, hydropower, wind energy, solar energy and other types of generation. Forecasts also show there will be growing demand for electricity by mid-century, he said.

“Finding a balance where you can do a number of things on the same ground — in this case energy production as well as agricultural production — is obviously huge,” Arnold said. If agrivoltaics is to become more than a buzzword, though, both farmers and solar project developers need to work out best practices.

One big issue is what crops can work well for large-scale utility projects. Compared to most solar farms projects in Eastern and Piedmont states, utility-scale solar projects in Ohio and other Midwestern states can spread across 1,000 acres or more, Arnold said.

“You hear a lot about produce and specialty crops,” for example, said Sarah Moser, Savion’s director of farm operations and agrivoltaics. But raising them is “hard to do on 1,000 acres.”

Hay, you!

Moser and Ohio State University researchers think forage crops like alfalfa and hay hold promise. Operations can be scaled up for large areas, said Eric Romich, an Ohio State University Extension field specialist for energy development. And the crops wouldn’t grow too tall amid the panels.

“We also wanted something that we felt had the potential to be economical,” Romich said.

Two 2023 reports by Ohio State University Extension researchers found raising hay and alfalfa between rows of solar panels was feasible and that the harvest’s nutritive value was good. But that small-scale work at the Pigtail Farms site in Van Wert County used data from only a few test plots and controls, which is an important limitation, Romich said.

Work at Madison Fields will now test whether similar results can be achieved at large scale. Part of a $1.6 million grant from the Department of Energy will help pay for that work over the course of four years.

Other research will test how well plants do in sun versus shade, Romich said. That matters because some portion of the land among solar panels will always be shaded.

Researchers planted the crops on test fields and control areas this spring, with an eye toward starting to collect data next year. “Forages are quite temperamental in terms of trying to get them established,” said Braden Campbell, an animal scientist at Ohio State University who is also working on the project. The team has found compacted soil around the solar panels, “but we are relieved to see that the seeds that we put into the ground are growing,” he said.

Moser plans to work with other crops, too. Soybeans are one example. They were already used as a cover crop before alfalfa and hay were planted. Soybeans can also work into a crop rotation when forage crops need to be replanted every few years.

“The market is there for it, and it does well” as a hardy crop which can also loosen soil and restore nutrients to it, Moser said, adding that local communities have expressed interest in the crop as well.

Send in the sheep

Other work at Madison Fields will explore complementary grazing. The goal is to harvest the forage crops as efficiently as possible. But there will still be a need for vegetation control under and around panels and other infrastructure, said Campbell. So, after harvesting, sheep will go to work.

“To me, that’s three commodities that we can get off one unit of land,” Campbell said: Solar panels will produce electricity. Hay and alfalfa growing will provide a crop. And the land will help support sheep, which in turn can produce meat, milk and fiber.

Other solar farms already use or plan to use sheep for vegetation control. But “there is a big difference” between using sheep to keep plants under control and relying on that for their nutrition, Campbell said.

Studies will need to test the health of sheep that do complementary grazing, compared to other sheep. Other questions include finding optimal grazing rates of sheep per acre, as well as other logistics. But first, the forage needs to establish good roots so it can withstand the pressure of grazing.

Tractors and more

A third bucket of research questions under the Department of Energy grant will focus on farm equipment. Tractors and other farm vehicles need to fit between the rows with their attachments. There’s been a trend in the agricultural sector toward wider equipment, which can cover more ground quickly but may not fit between rows of solar panels, Moser said.

“But a lot of farmers still have smaller equipment,” Moser continued, because some parcels aren’t appropriate for wider machinery. Maneuvering 15-foot-wide equipment works fairly well, and 17-foot and even 20-foot widths can still work. 

“I could get my 20-foot drill in there,” Moser said. “I just have to be careful.”

Arnold speculated that some companies may develop special equipment whose attachments can fit under solar panel rows more easily. Other possibilities could include raising panels or even feathering them when agricultural equipment is in use, he suggested.

Farm equipment doesn’t just need to go down an alley between two rows of solar panels. It will also have to turn around at the end to go down another one, Arnold said. So, there needs to be an adequate turning radius, without cables blocking farm vehicles’ paths. Poles, stands, and other equipment also can’t block the path of the farm equipment, he said.

The research can help guide the design of future solar projects to be “hay-ready” sites, Romich suggested. At the same time, agricultural operations shouldn’t jeopardize the safe and efficient operation of a solar facility. “It’s an operating power plant,” Romich said.

Arnold has additional questions about infrastructure needs: What facilities will be necessary to dry, bale and store forage? What facilities will other crops need? And how will they be trucked out to markets?

Likewise, what equipment and facilities will be needed for any sheep kept on site?  That includes paddock fencing, water, and so forth. And where will their caretaker live? 

“You’re going to have to have people there full-time,” Arnold said.

Precision agriculture

The Ohio State researchers, Moser, and others also wonder how well precision agriculture can work with solar farms. The term refers to methods that rely on technology and data to guide farmers’ work. The range of technologies includes remote sensing of field conditions with drones, in-ground sensors, automated weeders and more.

The big question is which precision agriculture technologies can work well for crops planted between rows of solar panels as they generate electricity.

It’s unclear what any of the studies will show until data has been collected and analyzed, Romich said. By the end, he feels the work will provide a better understanding of what will or won’t work.

Economics questions about business models, contractual arrangements and more also must eventually be worked out, Arnold said. At the end of the day, farmers will need to make a profit if agriculture is to successfully blend with solar projects.

“The possibilities are limitless, really,” when it comes to business arrangements, Moser said. “My motto is always, ‘farmers figure it out.’ And if we work with them, we’ll figure…out how to do this with best practices.”

Large-scale Ohio research project to explore how solar and farming can co-exist is an article from Energy News Network, a nonprofit news service covering the clean energy transition. If you would like to support us please make a donation.