Introduction
The Challenge of Dual Use of Land
In Campania, RWE commissioned two commercial agri-PV plants with a combined capacity of 19.1 MWac, installing a total of 32,500 modules on cultivated land in the municipality of Benevento. Each module is positioned on elevated structures at a minimum height of 3 meters, allowing for mechanized passage between rows and the continuation of agricultural activities below. The system produces enough energy to power approximately 13,000 Italian families each year, with an average energy density of 582 kWh/m²/year on cultivated land. These values represent a turning point compared to the past: in 2021, the entire Italian photovoltaic park occupied only 0.05% of the national surface area, but the growing demand for renewable energy has shifted the focus from mere installed capacity to a measurable territorial efficiency in physical units.
The systemic impact emerges from the tension between energy projections and geophysical constraints: while Europe aims to triple its production of renewable energy by 2035, Italian agricultural areas are already subject to increasing pressure from ground-mounted installations. The jurisprudence of the Constitutional Court has imposed a clear limit: each new plant must guarantee the continued productivity of the land, transforming agro-food sustainability into a necessary condition for approval. The marginal cost of this new threshold is no longer just administrative, but physical and operational.
The Reprogramming of the Energy Infrastructure
Advanced agri-PV systems, such as those from RWE, require a structural design that balances optimized shading with direct solar radiation. Mobile tracking structures allow for a variable tilt angle, maximizing energy output under low irradiance conditions and reducing thermal stress on underlying crops. This physical architecture implies greater construction complexity: each structure requires specific geotechnical analysis, with reinforced concrete foundations that must be placed at a depth of 1.8 meters to withstand dynamic wind loads. The installation cost exceeds €2.3/Watt in Italy, compared to the typical €0.95/Watt for ground-mounted systems.
This difference is not only financial: the water withdrawal rate for maintenance of the structures and irrigation of the underlying crops increases by 17% compared to conventional models, as plants must adapt to a more humid microclimate. In areas such as the Volturno Basin, where seasonal water availability is already at its limit, this increase represents a critical threshold for agricultural efficiency. The impact is not limited to input: in case of extreme events, such as the intense rains of 2025, surface drainage is altered by a factor of 1.3 compared to unpaved land, increasing the risk of erosion.
The Threshold of Sustainable Production
The cumulative effect of the dual use of land is evident in data from the University Federico II of Naples: a longitudinal analysis conducted between 2023 and 2026 revealed an average decrease of 14% in corn yield in areas with agri-PV installations compared to those without modifications. The evapotranspiration deficit, measured at 85 mm/m²/year for crops under the panels compared to 123 mm/m²/year in open fields, indicates a reduction in the natural soil recharge rate. However, the input-output balance of the entire system shows a net positive energy surplus of +64 GJ/ha/year compared to the traditional model.
This discrepancy has significant financial repercussions: for every hectare of land dedicated to agri-PV, the operating margin of the agricultural sector decreases by 23% due to the loss of productivity, while the value of the generated energy increases by 41%. The marginal cost of this transition is mainly borne by local asset managers, who must ensure compatibility between the two functions. At the regional level, the impact is concentrated in Campania and Sicily, where the water withdrawal rate per hectare exceeds 120 m³/year in municipalities with active installations.
Operational Implications and Strategic Leverage
The analysis demonstrates that the sustainability of agricultural soil is not an added value, but a physical threshold for accessing energy capital. The new model requires a paradigm shift: conversion efficiency must be measured in terms of net energy produced per unit of cultivated land, and not only in kWh/m²/year. The KPI impact is clear: each hectare converted to agri-PV results in an 18% decrease in agricultural yield, but an increase of +52 GJ/ha/year in available thermodynamic flow.
For decision-makers, this transition implies a revision of risk thresholds: the marginal cost of production sustainability can now be calculated in €/ha and must be included in the financial model. In 90 days, an investor who ignores this parameter may see the operating margin reduced by 37% for each project on agricultural land. The strategic leverage lies in optimizing infrastructure flows: those who manage to integrate high-efficiency irrigation systems with energy produced on site can obtain a net energy surplus equal to 28% of the agricultural needs, reducing dependence on external markets.
Photo by paul mocan on Unsplash
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