Working outdoors during a heat wave has become increasingly common for those who work in agriculture. As temperatures rise and summer drags on, The bodies of farm workers endure a constant heat load which goes far beyond simple tiredness at the end of the day. In this context, the agrivoltaics —solar panels elevated above crops— It is beginning to emerge as a tool that not only produces electricity, but also relieves that physical pressure.
In recent years, several research teams have focused on an aspect that had previously been overlooked: How the shadow cast by solar panels alters the daily experience of those who work the land. From environmental measurementsThrough interviews and direct observation, the results point in the same direction: placing solar panels on crops can clearly reduce heat stress and make agricultural days much more bearable, something especially relevant for Mediterranean territories such as Spain or southern Europe.
Agrivoltaics: crops and energy on the same land
Agrivoltaics is based on a simple but powerful idea: Install elevated photovoltaic systems on agricultural landleaving enough space for crops to grow and for people and light machinery to move around. In this way, the same plot of land produces food and renewable electricity without one activity displacing the other.
To achieve this balance, the panels are placed at a sufficient height and with calculated separations to to let part of the solar radiation that plants needbut filters out excess light and heat during peak hours. This design creates areas of partial and variable shade throughout the day, a kind of movable roof that shifts over the rows of crops.
Until recently, most studies on agrivoltaics focused on the effects on agricultural yield and water: Reduced evaporation, protection against extreme radiation or even retaining some nighttime heat in cold climates. However, new studies are beginning to show that the impact goes far beyond plants; in particular, the studies on agrivoltaics They are now exploring the human dimension of the phenomenon.
In agricultural regions with increasingly long and dry summers, such as large areas of Spain, This combination of photovoltaic structures and crops is emerging as a relevant adaptation strategyIt allows for the production of renewable energy, maintaining agricultural productivity and, at the same time, reducing workers' direct exposure to extreme heat.
A key finding: less direct heat and less heat stress
One of the most cited works on this topic was presented at the 2025 American Geophysical Union (AGU) Annual MeetingThe team, led by researcher Talitha Neesham-McTiernan from the University of Arizona, analyzed for four years a agrivoltaic exploitation In Colorado, Jack's Solar Garden, where the panels are installed high above the farmland.
On this property, photovoltaic structures generate bands of shadow that move throughout the dayThe researchers measured variables such as air temperature, relative humidity, wind speed, and solar radiation both under the panels and in unshaded plots, in addition to calculating heat stress indices such as wet-bulb and globe temperatures, a key reference for assessing the risk of heat stroke. Understanding [the specific conditions of the heat wave] is essential for this type of analysis. How is solar radiation measured? and what instruments are used.
The results showed that, at certain times of day and during the peak summer season, Exposure to heat could be up to 10°C lower than in the open airIn terms of heat stress indices, agrivoltaic areas recorded decreases of up to 5,5°C compared to fields without panels, a difference that, according to the authors, can mark the transition from an extreme risk situation to one in which work can continue with periodic breaks.
In practice, this reduction in thermal load translates into less accumulated fatigue, less sweating, less dehydration, and less strain on the cardiovascular systemFor day laborers who spend long days picking or handling produce under the sun, it means reducing the likelihood of dizziness, heat stroke, and other problems associated with continuous exposure to high temperatures.
How the shadow reorganizes the workday
Beyond the numbers, the study wanted to understand how do people actually move in an agrivoltaic fieldThe research team observed the workers' daily movements and interviewed them to learn about their perception of heat and shade. What they found was a very clear pattern: as the morning progressed and the sun grew stronger, the workers spontaneously reorganized their tasks to take advantage of the shaded areas.
From the early hours of the morning in summer, many farmworkers preferred to work under the panels whenever possible, leaving the less protected areas for other times of the day. This wasn't a decision planned by the farm management, but rather a everyday strategy for surviving the heat which was repeated day after day.
Shade not only reduces direct radiation on the skin; it also lowers the air temperature in the microclimateIt reduces the intensity of the light and alleviates the feeling of glare. According to the testimonials gathered, this translates into less mental exhaustion, better concentration, and less of a feeling of "burning out" as the hours pass.
One detail that the workers themselves highlighted was the possibility of to physically lean on metal structures to briefly rest your back, arms, or legs. These short breaks, added up throughout the day, help reduce muscle strain and the psychological stress associated with working long hours in a hostile environment.
Fresher water and more effective breaks
Among the seemingly minor aspects that the study documented, one stands out for its practical importance: the temperature of the water consumed by the farmworkersWhen bottles are left in the sun in a conventional field, the water reaches high temperatures very quickly, which discourages drinking and does not help to lower body temperature.
In the agrivoltaic farm analyzed, the bottles were placed under the solar panels They stayed fresh for hoursThis difference, which may seem minor, is key to maintaining adequate hydration and reducing the risk of dehydration and heatstroke. Drinking lukewarm or hot water in the middle of a heat wave does not provide the same relief or promote the body's recovery as effectively.
The workers also pointed out that the mere existence of a shady place to go to for a short break It provided them with clear mental relief. Knowing that a protected area is nearby helps them plan breaks better, improves their sense of control over the workday, and reduces the feeling of being constantly exposed.
Taken together, these elements—shade, fresh water, more restorative breaks—create a less stressful work environment for the body. While solar panels are obviously not a health solution, Yes, they alter the physical context in which agricultural work takes place., reducing some of the burden that currently falls on the bodies of the day laborers.
Data versus feelings: measuring heat in the field
The work of Neesham-McTiernan and her team cross-referenced two types of information: on the one hand, quantitative records of temperature, humidity, wind and solar radiationOn the one hand, there were detailed accounts from those who spend the day in the countryside; on the other, detailed testimonies from those who spend the day in the countryside. The intersection of both sources yielded an interesting message: data and feelings don't always coincide exactly, but they complement each other.
At certain times of day, the sensors identified specific areas as the hottest, while the workers indicated other areas as more difficult to bear. Far from diminishing the value of the analysis, This showed that heat stress cannot be explained solely by degrees Celsius.Factors such as accumulated fatigue, the type of task performed, the orientation of the body with respect to the sun, or even the clothing used influence how heat is perceived.
Therefore, the team insists that any policy or infrastructure design to reduce heat in the countryside should take this into account both instrumental data and people's direct experienceIn other words, it's not enough to just place sensors; you have to listen to those who work in the sun and observe their actual movements on the plot.
In terms of occupational health, this combination of objective measurement and human observation can help define More realistic protocols for breaks, hydration, and use of shadeThis is especially urgent in agricultural regions where heat waves are becoming more frequent, such as much of the Mediterranean basin.
Beyond crops: people at the heart of the energy transition
Traditionally, when discussing agrivoltaics or irrigation modernization, the conversation revolves around yield per hectare, water savings and energy efficiencyThe study presented at the AGU introduces a change of focus by placing in the foreground those who sustain the food system with their daily work.
According to the authors, agrivoltaic systems They should not be seen only as a way to optimize resourcesbut also as an opportunity to improve working conditions in a sector particularly vulnerable to climate change. Reducing heat stress, facilitating effective breaks, and ensuring adequate hydration become as important as the number of kilowatt-hours produced or the percentage of water saved.
This opens the door to the possibility that, in European agricultural regions at high risk of extreme heat, The installation of agrivoltaics on crops should also be considered as a public health measure and a measure for the prevention of occupational risks.It's not just about producing renewable energy, but about designing agricultural landscapes that allow for sustainable work for the people who live there.
The researcher herself has announced her intention to expand the analysis to other climates and regions of the world, incorporating physiological data — such as heart rate, perspiration or skin temperature — that allow for further refining the real impact of agrivoltaics on the health of workers.
Potential in Spain and Europe in the face of extreme heat
Although the case analyzed is located in the United States, the conclusions are easily extrapolated to Mediterranean agricultural contexts such as Spain, Italy, Greece or southern Francewhere heat waves are becoming increasingly intense and prolonged. In many of these areas, harvesting coincides with the months of highest solar radiation, increasing the risk of heatstroke in the fields.
The implementation of agrivoltaic systems in vineyard, fruit orchard, vegetable farms or irrigated crops could contribute a double benefit: partial protection of crops and direct reduction of the heat load on peopleFurthermore, generating electricity on the farm itself would allow for the supply of irrigation systems, water pumping, or refrigeration facilities, strengthening the farm's resilience to heat waves and drought.
In the context of European policies on decarbonization and adaptation to climate change, agrivoltaics fits into several priorities: Promotion of renewable energies, maintenance of agricultural activity and improvement of working conditions. However, experts insist that it is not a valid solution for every crop or every situation.It requires prior analysis of each case, specific design of structures and, above all, participation of the farmers and workers themselves in the planning.
With summer temperatures breaking records repeatedly, the debate about adapting agricultural work to extreme heat is no longer theoretical. Agrivoltaic systems are beginning to be seen as concrete tools so that the energy transition also serves to protect the health of those who support the food system, and not just to change the source of electricity.
The experience gained at farms like Jack's Solar Garden shows that, when solar panels are thoughtfully integrated into crops, It's not just the figures for energy production or agricultural yield that changeThey also transform how a workday is experienced under the sun. Less direct heat, cooler water, more restorative breaks, and less heat stress create a scenario where technological innovation translates into less strained bodies, something especially valuable in a world where extreme heat threatens to become the new norm in agriculture.
