Can the worlds of agriculture and solar energy be harmonized rather than set against one another? A pioneering study spearheaded by researchers Maddalena Curioni, Nikolas Galli, Giampaolo Manzolini, and Maria Cristina Rulli from the Politecnico di Milano has cast new light on this intriguing question. Published in the respected journal Earth’s Future, their research meticulously explores the potential synergy between photovoltaic (PV) panel installations and agricultural crop cultivation. This innovative concept, known as agrivoltaics, offers a promising pathway to mitigate the escalating land-use conflicts fueled by burgeoning food production demands and the urgent need for renewable energy expansion.
Historically, land use for agriculture and energy production has been viewed as a zero-sum game. The rapid proliferation of ground-mounted solar panels has increasingly encroached upon fertile agricultural land, creating a competition that threatens sustainable land management globally. Current statistics suggest that 13 to 16 percent of these solar installations occupy land formerly dedicated to farming. This overlap intensifies the struggle to balance critical food security objectives against climate-driven energy transitions, raising the stakes for finding integrative solutions.
The concept of agrivoltaics disrupts the binary choice between agricultural and energy land use. This study’s novel spatial agro-hydrological model simulated how 22 different globally relevant rainfed crops respond to varying degrees of solar radiation attenuation caused by PV panels. The research presents compelling evidence that between 22 and 35 percent of rainfed agricultural lands worldwide can support agrivoltaic systems without compromising overall food production capacity substantially. This balance unlocks a revolutionary dual-use approach whereby crops can thrive beneath solar arrays, thereby maximizing land productivity in a mutually beneficial manner.
At the core of this research lies a sophisticated biophysical simulation framework, accounting not only for light reduction but also for complex climate interactions and soil moisture dynamics. By varying radiation constraints—ranging from configurations allowing complete yield maintenance to scenarios permitting up to a 20 percent yield reduction—the model delineated global zones of viable agrivoltaic implementation with unprecedented spatial precision. The triangular bivariate color scheme developed visualizes the overlap between harvested areas and their agrivoltaic convertibility potential, charting a detailed global map for land-use planning.
One of the remarkable insights highlighted by co-author Nikolas Galli, a researcher with the Glob3Science Lab, emphasizes the scalability of agrivoltaics across diverse agroecological contexts. "Agrivoltaics cannot be applied everywhere," Galli acknowledges, "but according to our results, it would be possible to combine cultivation and energy production in many global regions without significant yield penalties." This underscores the tailored, location-specific approach necessary to unlock agrivoltaics’ full potential and avoid a one-size-fits-all mentality often seen in land management policies.
Moreover, Giampaolo Manzolini, a professor in the Department of Energy, elaborates on the synergies from an engineering and energy efficiency perspective. "Utilizing the same land for crops and photovoltaic modules increases the output per surface area and reduces production costs. Additionally, vegetation beneath panels can lower their operating temperature, enhancing photovoltaic efficiency." This thermal regulation effect attests to the intricate eco-technical feedback loops agrivoltaic systems can harness, fostering both agronomic and energy optimization.
Beyond the technical advantages lies a profound environmental and socio-economic significance. Maria Cristina Rulli, the lab coordinator and co-author, stresses its role in promoting sustainability: "This technology has the potential to reduce land competition while improving the sustainability of agricultural and energy systems." Integrating agrivoltaics could lessen pressures on natural ecosystems by reducing the need to convert forests or other high-biodiversity habitats into farmland or solar parks, thereby aligning with global conservation targets.
The study’s comprehensive global mapping opens avenues for policy makers and investors to strategically target agrivoltaic deployment where it is most effective. Such informed decision-making can generate high-impact returns on investment, ensuring renewable energy expansion does not come at the expense of food security. By presenting agrivoltaics as a scalable and scientifically validated land-use strategy, the research supports a paradigm shift from trade-offs toward synergies in land management.
Technically, the integration of photovoltaic systems with crop cultivation necessitates careful engineering design to optimize module spacing, tilt, and height, ensuring sufficient light penetration for photosynthesis. Agrivoltaic arrangements must balance shade patterns, crop type sensitivities, and local climatic conditions. The research’s use of an agro-hydrological model is pivotal in quantifying these variables over diverse environments, advancing the precision with which agrivoltaic projects can be planned and executed.
It is important to note the role of crop selection in agrivoltaics’ success. The 22 crops analyzed include cereals, legumes, and horticultural species with varying radiation tolerance and water requirements, reinforcing that agrivoltaic applicability is crop- and context-dependent. This crop-specific modeling ensures that proposed land-use integrations maintain agronomic viability while supporting energy generation goals.
As global climate systems grow increasingly volatile, strategies like agrivoltaics can enhance resilience by diversifying land functions and buffering against market or climatic shocks. Multipurpose land use smooths risk profiles and contributes to circular economy principles, positioning agrivoltaics as a forward-looking solution with both immediate and long-term benefits.
Ultimately, the research by the Politecnico di Milano team signals a compelling step toward reconciling two of the 21st century’s greatest challenges: sustainable food production and clean energy generation. By scientifically validating the feasibility and benefits of agrivoltaic systems at a global scale, this study paves the way for transformative land policies that harness the latent synergy between sunlight and soil.
Subject of Research: Agrivoltaics and land-use synergy between solar energy and agriculture
Article Title: Global Land-Water Competition and Synergy Between Solar Energy and Agriculture
News Publication Date: 18-Feb-2025
Web References: http://dx.doi.org/10.1029/2024EF005291
Image Credits: Politecnico di Milano
Keywords: Photovoltaics, Solar energy, Crops, Land use, Renewable energy, Energy policy, Climate systems, Sustainable energy, Solar radiation, Crop yields, Sustainable agriculture, Agricultural policy, Crop domestication, Solar power
