In the Arizona desert, a row of cherry tomato plants sits in the shade of elevated solar panels, soaking up filtered light while the modules above them feed electricity to the grid. Those shaded plants produced roughly twice the fruit of identical plants growing under open sky, according to a peer-reviewed field experiment led by Greg Barron-Gafford at the University of Arizona’s Biosphere 2 facility. They also used less water. As of May 2026, that finding remains one of the most striking results to emerge from the growing field of agrivoltaics, the practice of co-locating crops and solar panels on the same land.
The concept is simple: instead of forcing farmers to choose between food production and renewable energy, design solar installations that allow both. For tomatoes, a crop that wilts under extreme heat and drinks heavily in dry climates, the partial shade from photovoltaic panels turns out to be more help than hindrance.
The field evidence
“We were surprised that theichili peppers and cherry tomatoes growing in the agrivoltaic system actually had dramatically higher yields,” Barron-Gafford told the University of Arizona news service when the study was published. His team, publishing in Nature Sustainability in 2019, measured specific microclimate shifts beneath the panels at Biosphere 2: cooler daytime air temperatures, warmer nights, and lower vapor pressure deficit. Together, those changes reduced heat stress on the tomato plants and slowed soil evaporation. The cherry tomatoes did not just survive in the shade. They thrived, producing about double the fruit of their sun-exposed counterparts while requiring less irrigation.
A separate single-site study on the tomato variety Solanum lycopersicon var. Legend, published in the MDPI journal Sustainability in 2021, tested how water productivity shifted depending on where plants sat relative to a solar array: directly beneath panels, between panel rows, or in full sun. The results showed measurable differences in irrigation efficiency and crop output at each position, reinforcing a key point for anyone designing these systems. Panel placement is an engineering variable that directly shapes what the crop produces. Because this was a single-site experiment published in a journal whose titles vary in peer-review rigor, the findings are best treated as indicative rather than definitive until replicated elsewhere.
Work at the National Renewable Energy Laboratory has pushed the idea further. In controlled experiments, NREL researchers grew tomatoes under spectrally selective panels, modules engineered to filter sunlight and pass through the wavelengths plants use most efficiently for photosynthesis. According to descriptions in NREL’s multi-state InSPIRE program materials, the tomatoes showed improved growth compared to controls, though the specific study underlying that claim has not been published as a standalone peer-reviewed paper accessible to the public as of April 2026. That distinction matters: the result suggests that the optical properties of the panel material itself can be tuned to benefit the crop below, but until a full publication with methods and data is available, the finding should be considered preliminary.
More recently, an independent study published in Scientific Reports, a peer-reviewed journal in the Nature portfolio, evaluated tomatoes grown under an Agri-PV installation and reported that the plants maintained or improved yield metrics and physiological performance, including fruit count and biomass, under panel-induced shading while the same land generated electricity. The researchers framed their findings around dual land use and profitability, concluding that the economic value of combined crop and energy output exceeded that of either use alone. The study adds a newer, separate line of evidence to the case that agrivoltaic tomatoes are more than a laboratory curiosity, though its specific site conditions and panel configuration may not generalize to all growing regions.
What we still do not know
The most honest reading of the research is that it proves a concept without yet proving a business model.
Most published agrivoltaic tomato trials cover one growing season, or at most a few. No long-term, multi-year dataset has been released confirming whether the yield gains hold up across different weather years or as panels age and lose efficiency. Short-term results are promising, but farming is a long game.
Commercial-scale economics are another gap. Published studies discuss profitability in general terms, but none in the current body of evidence include detailed cost-benefit modeling from working farms. How much does it cost per acre to install elevated solar structures over a tomato field? What is the maintenance overhead? Does a “solar-grown” tomato command any price premium at market? These are questions growers need answered before writing checks, and the peer-reviewed literature has not answered them yet.
“We need farmers involved in the design process from the start,” Barron-Gafford has noted in public presentations, emphasizing that research-station results do not automatically translate to commercial operations where equipment access, labor costs, and crop insurance all factor into decisions.
Panel design introduces its own complexity. Research on processing tomatoes under multiple shading regimes, including dynamic and vertical panel positioning with different ground-coverage ratios, shows that yield and fruit quality shift depending on how much shade reaches the crop. A poorly configured array could starve plants of light. An optimized layout could boost both energy capture and fruit output. The optimal balance almost certainly differs by latitude, climate, and tomato variety, and no single design standard has emerged.
Practical farm management questions also linger. Elevated solar structures can complicate the use of large machinery, alter pest and disease dynamics, and change labor requirements for pruning and harvest. Researchers acknowledge these trade-offs, but they have not been quantified in a way that lets a grower compare agrivoltaic production with conventional farming on a whole-operation basis.
And then there is nutrition. Whether growing tomatoes under partial shade changes their lycopene content or other health-relevant compounds has not been directly measured in published primary research. Plant biology suggests it is plausible, but plausible is not the same as proven.
What this means for growers and policymakers
The core finding, that cherry tomato yields can double under solar panels in a hot, arid climate while water use drops, rests on solid peer-reviewed data from a university research station. Readers can treat it as reliable for the specific conditions tested: southern Arizona, standard photovoltaic panels, cherry tomato plants. Generalizing those numbers to other regions, climates, or tomato varieties requires caution.
NREL’s spectrally selective panel work is a different kind of evidence. It was conducted under controlled conditions rather than open-field farming, and the underlying data have not been published in a standalone peer-reviewed paper available as of April 2026. That means it demonstrates biological potential, not farm-ready performance. Translating those results to commercial agriculture requires field validation that is still underway through the InSPIRE program.
For farmers weighing whether to invest, the studies comparing tomato responses at different positions relative to a solar array offer the most practical guidance. They show that outcomes depend heavily on system design. A grower considering agrivoltaics should focus less on headline yield numbers and more on the specific panel height, spacing, orientation, and ground-coverage ratio that produced those numbers, then match those parameters to local conditions.
The first concrete step for anyone interested is checking whether state solar incentives and federal crop insurance programs accommodate dual-use installations. Regulatory and financial frameworks vary widely, and a system that pencils out in Arizona may not in Ohio. Regional agricultural extension offices and NREL’s InSPIRE database are the best starting points for site-specific guidance.
What the research establishes clearly is that the relationship between solar panels and tomato plants is not a zero-sum trade-off between shade and sunlight. Under the right conditions, partial shading relieves heat and water stress enough to offset reduced direct light, and sometimes to push total fruit production higher than full-sun growing. Tomatoes can be part of a viable agrivoltaic strategy. But turning that potential into a reliable production model will take longer-term field trials, transparent cost data, and the kind of design standards that only come from years of real-world use.
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*This article was researched with the help of AI, with human editors creating the final content.
