Agrivoltaics: Solar Panels on Farms Could Be a Win-Win

A dual-use solar array in Massachusetts.

The photo voltaic panels within the fields on the College of Massachusetts Crop Analysis and Schooling Middle don’t seem like what most of us have come to anticipate. As an alternative of hunkering near the earth, they’re mounted seven ft off the bottom, with ample room for farmers or cows to wander beneath. Panels are separated by two- and three-foot gaps, as an alternative of clustering tightly collectively. Mild streams via these areas and, beneath, rows of leafy kale and Brussels sprouts exchange the standard naked earth or grass.

This uncommon association is among the first examples of a dual-use photo voltaic set up—typically referred to as agrivoltaics. It’s a photovoltaic array that’s raised far sufficient off the bottom and spaced in such a approach that some crops can nonetheless develop round and beneath the panels. The aim is to assist farmers diversify their revenue via renewable power era, whereas holding land in agricultural use and decreasing greenhouse fuel emissions.

“This would appear like an excellent factor—you get to farm and use the identical actual area to generate cash from photo voltaic manufacturing,” stated Brad Mitchell, deputy government director of the Massachusetts Farm Bureau Federation. “Nevertheless it’s nonetheless within the early levels.”

The thought of manufacturing photo voltaic power and rising crops on the identical land has been round for some time. Remoted demonstration and analysis installations are in place or deliberate in Arizona, Japan, and France. In recent times, nevertheless, the idea has develop into extra engaging, as the worth of photovoltaic panels has plummeted, curiosity in renewable power has risen, and monetary pressures on small farmers have grown. And since photo voltaic arrays typically displace agriculture, inflicting rigidity between the 2 land makes use of, agrivoltaics is being seen as a possible win-win.

A dual-use photo voltaic array in Massachusetts.

Massachusetts is on the forefront of the push. The state’s formidable renewable power objectives—present targets name for three,600 megawatts of wind and photo voltaic capability by the top of 2020, doubling the state’s present output of 1,800 megawatts—have created a surge of curiosity in creating photo voltaic tasks, however the state’s excessive inhabitants density signifies that out there land is scarce.

Moreover, many native meals advocates argue that an insufficient portion of the meals consumed in Massachusetts is grown there. The brief rising season together with excessive prices for labor and land could make farming in Massachusetts a financially precarious proposition. Some advocates say that dual-use photo voltaic installations have the potential to ease a variety of these issues directly.

Historically, when photo voltaic builders flip to farmland for his or her tasks, the property is leased or bought to the developer, the topsoil is stripped, and the panels are mounted on concrete footings embedded within the land. Whereas the shift boosts renewable power era, it weakens the native meals provide. Some counties have even began prohibiting large-scale photo voltaic developments on agricultural property as a approach to protect the land.

Twin-use developments are notably suited to Massachusetts’ wants, and the state is seizing the chance. The UMass set up, a partnership between personal photo voltaic firm Hyperion Techniques and the college, is residence to a singular analysis venture aimed toward calculating precisely nicely how totally different crops fare when grown beneath raised panels. And the state’s new photo voltaic incentive program, often known as Photo voltaic Massachusetts Renewable Goal (SMART), provides additional compensation for dual-use tasks.

“To our information, no place else is doing what we’re doing,” stated Michael Lehan, an advisor to Hyperion Methods.

Agrivoltaics’ Origin Story

The story of dual-use tasks in Massachusetts dates to 2008, when development firm proprietor Dave Marley put in a photo voltaic array on the roof of his headquarters in Amherst and shortly determined he needed to generate much more power. As he began contemplating farmland as a location, Marley turned decided to discover a approach to keep away from interrupting the land’s agricultural use.

“He stored emphasizing, ‘I need to maintain the land alive and nicely. I don’t need to cowl up the land,’” stated Gerald Palano, renewable power coordinator for the Massachusetts Division of Agricultural Assets.

In 2009, Marley related with researchers at UMass and in 2010 his imaginative and prescient turned a actuality with the development of a 70-panel array at a analysis farm in South Deerfield, Massachusetts. The next yr, Marley shaped Hyperion Photo voltaic to pursue this new strategy to renewable power. Marley died in 2013, and his son James has taken over the enterprise.

Immediately, the dual-use set up Dave Marley envisioned stays in place, advancing his objectives. The decrease ends of the panels are raised seven ft off the bottom and rise to 15 ft within the air. They’re spaced far sufficient aside to permit daylight to move via to the sector under and might be shifted horizontally to regulate the hole. The panels are supported by vertical poles embedded 10 ft into the bottom. No concrete is used, so the injury to the soil is restricted and utterly reversible.

“What farmers actually care about is the land,” Lehan stated. “And there’s minimal soil disruption.”

Installing the poles to mount a solar array.

Putting in the poles to mount a photo voltaic array.

Because the array got here on-line in 2011, Stephen Herbert, professor of agronomy at UMass, has been learning the impression of the panels on crop progress. His outcomes have been encouraging.

When he cultivated grass and different forage crops to help grazing cows, the land beneath the panels yielded greater than 90 % as a lot quantity as land that acquired direct solar. For beef or dairy farmers, agrivoltaic arrays are a “no-brainer,” Hebert stated, between bites of a recent Brussels sprout he plucked from a stalk beneath a panel.

Can Agrivoltaics Work?

Early outcomes recommend that, when grown beneath the panels, greens comparable to peppers, broccoli, and Swiss chard can produce about 60 % of the quantity they might in full solar. On the similar time, a dual-use system provides about half the power-generation capability per acre of a standard set up, and the prices are greater.

Nevertheless, whereas these techniques supply much less power era and decrease crop productiveness than photo voltaic panels or agriculture alone, the mixture usually pays off.

“Completely,” Lehan, Palano, and James Marley stated, almost in unison.

Hyperion estimates that its dual-use installations pay for themselves in about eight years, beneath common circumstances. State and federal grants can shorten that timeline.

To assist speed up the adoption of this new strategy, Massachusetts is placing some cash on the road. In November, the state launched the SMART program, which pays photo voltaic house owners a hard and fast base price for each kilowatt-hour of power they generate. The quantity they earn is then deducted from the price of the electrical energy they draw from the grid when the panels aren’t producing sufficient energy. If an proprietor produces extra power than they use, they will apply these credit to future payments.

The underside of a dual-use solar array. The hardware used to mount the panels make it easy to reposition each panel to maximize the light needed to grow crops underneath.

The underside of a dual-use photo voltaic array. The hardware used to mount the panels make it straightforward to reposition every panel to maximise the sunshine wanted to develop crops beneath.

Base charges for these photo voltaic installations vary from 15 cents to 39 cents per kilowatt-hour, relying on the dimensions and site of the event. Tasks that mix photo voltaic panels with farming earn an additional 6 cents per kilowatt-hour. In sensible phrases, that signifies that a 1-megawatt system on agricultural land, with photo voltaic panels in fastened positions which might produce round 1.2 million kilowatt-hours of power in a yr, would earn an additional $72,000 towards an electrical invoice.

Within the first six weeks of SMART, 5 purposes proposed dual-use tasks and one other two have submitted pre-determination requests, an earlier step within the course of. A number of extra builders have inquired about potential developments, Palano stated. The proposed tasks vary from 249 kilowatts to 1.6 megawatts.

“We expect the extent of curiosity is there from large-scale builders and others however the idea is new, so they’re needing to take a position extra time to raised perceive,” he stated. “We’re comfortable to see the curiosity up to now.”

Not each agricultural space will profit from agrivoltaics. The added prices and energy won’t make sense in a area that already has loads of open, non-agricultural area to host photo voltaic arrays, for instance.

In locations like Massachusetts, nevertheless, Palano stated the know-how is just going to get higher and extra useful. He’s already seeing curiosity in panels that transfer to comply with the solar, maximizing their power era. He additionally expects rising curiosity in storage, primarily giant batteries that may acquire energy and reserve it to be used when the solar isn’t shining. The longer term might even embrace translucent panels that might let extra mild by way of to crops rising under, he added.

“We’re saying, ‘let’s see if we will get this to the subsequent degree,’” stated Palano. “We’re wanting ahead to the innovation.”

Prime photograph: Tomatoes rising beneath photo voltaic panels on the College of Massachusetts. (All photographs courtesy of Hyperion Techniques.)

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