Horticulture-Voltaic: The Earth's Solar Horticulture Turns Every Ray into Food and Power - A Comprehensive Review
Abstract
Horticulture-voltaic systems - the co-location of photovoltaic (PV) electricity generation with horticultural crop production on the same land - are emerging as a central strategy for climate-resilient horticulture. This in-depth review examines the technology, engineering, intercultural operations and empirical evidence for horticulture-voltaics applied to fruit, vegetable and flower crops. We cover solar panel technologies, system architectures, the full design-component and engineering stack (mounting heights of 2.5-5 m, panel spacing and tilt, deep-buried armoured cables, structural safety under ASCE-7-16 wind loads, smart irrigation integration), the electrical architecture (module/string voltage, inverter, battery, transformer, grid connection), and intercultural operations adapted for sub-array horticulture. Empirical evidence shows that shade relieves heat and drought stress, with grape +277% (Mediterranean, LER 3.54), tomato and chiltepin doubled or tripled (Arizona), and partial shade increasing floral abundance in flowers. Shading must stay below ~30% for fruit crops and 20-40% for most vegetables and flower crops. With continued research and engineering, horticulture-voltaics can deliver climate-adaptive, resource-efficient and energy-positive horticultural systems.
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Introduction
Horticulture-voltaic systems - the co-location of photovoltaic (PV) electricity generation with horticultural crop production on the same land - are emerging as a central strategy for climate-resilient horticulture. The concept of agrivoltaics (agri-PV, or AV) was first proposed by Goetzberger and Zastrow (1982) and has since grown from a niche idea into a rapidly expanding global field of research and commercial deployment [1,2]. The core proposition is dual land use: solar panels generate electricity while the shade they cast moderates the microclimate beneath, reducing heat and drought stress, lowering evaporative demand and, in hot dry regions, often improving crop performance and water-use efficiency [3,4].
The rationale is compelling. Global food demand is projected to rise by 35-56% by 2050 while agricultural land is finite, and the transition to renewable energy requires large land areas; co-locating the two uses avoids the land-use conflict between food and energy [4,5]. Empirical studies report that agri-voltaic arrays can raise land-use efficiency above 180% - producing electricity and crops on the same hectare - while cooling panels (improving their electrical efficiency) and cooling the crops and soil beneath [4,6].
For horticulture the stakes are especially high. Perennial fruit crops (apple, grape, citrus, fig, olive, pomegranate), high-value vegetables (tomato, chilli, brinjal, leafy greens) and flower crops (rose, gerbera, marigold, chrysanthemum, tuberose) are increasingly exposed to heat waves, drought, salinity and erratic weather. The shade, cooler soil and conserved soil moisture under PV arrays offer a measurable resilience benefit [7,8]. At the same time the same shade can reduce yield and quality if it exceeds crop-specific thresholds: for fruit crops, shading above roughly 30% risks substantial declines [9,10].
This review provides an in-depth, engineering-oriented account of horticulture-voltaic systems, restricted to horticultural crops - fruits, vegetables and flower crops. It covers the solar technology models, system architectures, mounting designs, electrical architecture, infrastructure and installation components, engineering design parameters, intercultural operations adapted for sub-array cropping, and empirical evidence and ongoing research supporting the technology, with four labelled diagrams for systems engineering, design components, intercultural operations, and electrical schematics.
Conclusion
Horticulture-voltaic systems offer a compelling route to climate-resilient horticulture by producing renewable electricity and protecting fruit, vegetable and flower crops on the same land. The shade, cooler soil and conserved moisture under PV arrays relieve heat and drought stress: grape yield rose by 277% under a Mediterranean array, tomato and chiltepin production doubled or tripled in Arizona, and partial shade increased floral abundance in flower crops. The engineering - panel type, mounting height and tilt, structural safety under wind loads, deep-buried armoured cables, smart irrigation and inverter-battery grid architecture - must be tailored to each crop's height and shade tolerance, with shading kept below ~30% for fruit crops and 20-40% for most vegetables and flower crops. Intercultural operations (weeding, mulching, training, pruning, thinning, staking, plant protection) integrate with the array's geometry and microclimate: the AV site is at once an energy plant, a horticultural field and a managed agro-ecosystem.
Limitations of the Review: This review is based on a narrative synthesis of published literature rather than a formal systematic review. The examples are selected to illustrate the diversity of approaches and should not be considered exhaustive. The focus is primarily on peer-reviewed studies from 2019 onwards, but may not capture all relevant research, particularly from non-English sources or grey literature. The economic and policy analyses are based on general observations rather than comprehensive regional assessments. Future work should include systematic reviews, meta-analyses of crop responses, and region-specific economic assessments.
Key Recommendations:
- For Researchers: Conduct systematic meta-analyses of crop responses to shading; develop crop-specific shading threshold models; investigate cultivar variability in shade tolerance; and establish standardised data collection protocols across sites.
- For Engineers: Develop cost-effective elevated mounting structures; optimise panel configurations for crop light requirements; and improve wind-load design codes for tall agri-voltaic structures.
- For Policymakers: Establish clear regulatory frameworks for agrivoltaics; provide subsidies and incentives for dual-use systems; and support research and demonstration projects.
- For Farmers: Start with pilot projects on small areas; select shade-tolerant crops; and seek technical advice on system design and operation.
With continued research, standardised data and capacity building, horticulture-voltaics can deliver climate-adaptive, resource-efficient and energy-positive horticultural systems worldwide.
References
- Goetzberger, A., & Zastrow, A. (1982). On the coexistence of solar-energy conversion and plant cultivation. International Journal of Solar Energy, *1*(1), 55-69.
- Dupraz, C., Marrou, H., Talbot, G., et al. (2011). Combining solar photovoltaic panels and food crops for optimising land use: Towards new agrivoltaic schemes. Renewable Energy, *36*(10), 2725-2732.
- Pacheco-Ruiz, P., et al. (2025). From data to decisions: A paradigm shift in fruit agriculture through the integration of multi-omics, modern phenotyping and bioinformatic tools. Frontiers in Plant Science, *16*, 1707289.
- Barron-Gafford, G. A., Pavao-Zuckerman, M. A., Minor, R. L., et al. (2019). Agrivoltaics provide mutual benefits across the food-energy-water nexus in drylands. Nature Sustainability, *2*(9), 848-855.
- van Dijk, M., Morley, T., Rau, M. L., & Saghai, Y. (2021). A meta-analysis of projected global food demand and population at risk of hunger for the period 2010-2050. Nature Food, *1*(7), 494-501.
- Fraunhofer ISE. (2019). Agrophotovoltaics: High-harvesting yield in hot summer of 2018 [Press release]. Fraunhofer Institute for Solar Energy Systems. https://www.ise.fraunhofer.de/en/press-media/press-releases/2019/agrophotovoltaics-hight-harvesting-yield-in-hot-summer-of-2018.html
- Widmer, J., et al. (2024). Agrivoltaics: A review of the current state of research and implementation. Renewable and Sustainable Energy Reviews. https://www.sciencedirect.com/science/article/pii/S1364032123011358
- International Energy Agency (IEA). (2023). Agrivoltaics: Solar and farming can co-exist (PVPS Task 13 report).
- Magarelli, A., Mazzeo, A., & Ferrara, G. (2025). Agrivoltaics in a Mediterranean vineyard: Soil moisture, microclimate, yield and land equivalent ratio. Horticulturae, *11*(2), 160. https://www.mdpi.com/2311-7524/11/2/160
- Ferrara, G., Magarelli, A., & Mazzeo, A. (2024). Agrivoltaics for fruit crops: Shading thresholds and resilience [Review]. University of Bari Aldo Moro.
- Hussain, S. N., et al. (2024). Bifacial photovoltaic modules in agrivoltaic systems: Performance and benefits. Solar Energy. https://www.sciencedirect.com/science/article/pii/S0038092X24007977
- The Innovation Energy. (2025). Agrivoltaic greenhouses: Electricity above, crop below. https://www.the-innovation.org/article/doi/10.59717/j.xinn-energy.2025.100124
- PVcase. (n.d.). Agrivoltaics: The technical guide to design and implementation.
- Solar Racks. (2026). Agrivoltaics mounting: Dual-use design guide. https://www.solaracks.com/agrivoltaics-mounting-structures-design-guide-for-dual-use-solar-and-agriculture/
- Applied Energy. (2025). Design parameters of agrivoltaic systems: Ground coverage ratio, clearance height and tracking. https://www.sciencedirect.com/science/article/pii/S0306261925004805
- Energies. (2025). Fixed-tilt versus tracking in agrivoltaic systems. Energies, *18*(10), 2553.
- pv magazine. (2024-2026). Agrivoltaics in Italy: Laterza and Scalea projects (Vigna Agrivoltaica di Comunita, Le Greenhouse). https://www.pv-magazine.com
- Renewable Energy. (2023). Interspersed bifacial agrivoltaic systems: Fixed vertical versus dynamic single-axis tracking in Belgium. https://www.sciencedirect.com/science/article/abs/pii/S0960148123010960
- Carrasco-Astudillo, N., et al. (2026). Rooftop agrivoltaic systems integrating urban agriculture and photovoltaic generation. https://www.sciencedirect.com/science/article/pii/S0360132326005718
- OpenEI / NREL. (2024). InSPIRE Design & Configurations Guide (Agrivoltaics Technical Guide). https://docs.nlr.gov/docs/fy25osti/91672.pdf
- Gautam, S., et al. (2024). Impact of solar panel spacing on wind load in an elevated solar panel structure. https://link.springer.com/article/10.1007/s44245-024-00081-4
- Sentnet Engineering. (2026). Vertical agrivoltaic wind loads: 15 months of AgriPV field data.
- Leonics. (n.d.). Sizing of PV systems: Module, string and inverter specifications. https://www.leonics.com/support/article2_12j/articles2_12j_en.php
- AIP Conference Proceedings. (2024). Smart irrigation integration with PV systems for water-energy-food nexus.
- Mayfield Energy. (2023). How to calculate PV string size: Maximum system voltage (1000/1500 Vdc). https://www.mayfield.energy/technical-articles/2023-update-how-to-calculate-pv-string-size/
- ASCE 7-16. (2016). Minimum design loads and associated criteria for buildings and other structures. American Society of Civil Engineers.
- Special Cultural Operations in Vegetable Production for Enhanced Yield and Quality. (2024). ResearchGate. https://www.researchgate.net/publication/381915259
- AgriScan. (2025). Inter-cultural operations in crop production. https://agriscan.in/inter-cultural-operations-in-crop-production/
- Juillion, P., et al. (2022). Shading effect of photovoltaic panels on apple fruit quality and alternate bearing. Scientia Horticulturae. https://www.sciencedirect.com/science/article/abs/pii/S0304423822005544
- Oregon State University. (2023). Partial shade from solar panels increases abundance of flowers in late summer. https://news.oregonstate.edu/news/partial-shade-solar-panels-increase-abundance-flowers-late-summer
- OpenEI. (n.d.). Tracking optimization in agrivoltaic systems: A comparative study for apple orchards. https://openei.org/wiki/Tracking_Optimization_in_Agrivoltaic_Systems:_A_Comparative_Study_for_Apple_Orchards
- Hosseini, E., & Bou-Zeid, E. (2024). Modeling the microclimate and crop response of agrivoltaic systems: A tomato field case study. Journal of Advances in Modeling Earth Systems.
- NCAT. (n.d.). Crops uniquely suited to growth in agrivoltaic settings. https://www.ncat.org/blog/crops-uniquely-suited-to-growth-in-agrivoltaic-settings/.