Case study: Agrivoltaics & dual-use farmland — a city or utility pilot and the results so far

In 2022, the French commune of Tresserre in the Pyrenees-Orientales department launched a 2.4 MWp agrivoltaic installation across 4.5 hectares of vineyard, becoming one of Europe's first municipality-led dual-use solar pilots to reach full operational status. By the end of 2025, the pilot had generated 3,200 MWh of electricity annually while maintaining grape yields within 5% of pre-installation baselines, and during the record 2023 heatwave the shaded vines showed 20 to 30% lower water stress compared to unshaded control plots. The Tresserre project, developed in partnership with Sun'Agri and EDF Renouvelables, demonstrates how European cities and utilities are turning agrivoltaics from a research concept into a scalable land-use strategy that generates revenue, protects crops, and advances municipal climate targets simultaneously.

Why It Matters

Europe faces a land-use tension that is intensifying each year. The European Commission's REPowerEU plan calls for 600 GW of installed solar capacity by 2030, roughly triple the 2023 installed base. Simultaneously, the Common Agricultural Policy (CAP) mandates preservation of productive agricultural land, and the EU's Farm to Fork Strategy sets targets for 25% organic farming by 2030. These objectives compete directly for the same land. Germany's Fraunhofer ISE estimates that dedicating just 5% of Europe's arable land to agrivoltaics could generate over 700 GW of solar capacity without removing a single hectare from food production (Fraunhofer ISE, 2024).

The financial case is equally compelling. Conventional ground-mounted solar generates lease payments of EUR 1,500 to EUR 3,000 per hectare annually for landowners, but removes the land from agricultural production entirely. Agrivoltaic systems, when properly designed, allow farmers to collect both crop revenue and energy income, with combined returns of EUR 4,000 to EUR 8,000 per hectare per year depending on crop type and local electricity prices. For municipalities, agrivoltaics offer a pathway to meeting renewable energy targets without the political friction of converting farmland, a dynamic that has stalled or blocked conventional solar projects across southern France, Italy, and Spain.

The EU's revised Renewable Energy Directive (RED III) now explicitly recognizes agrivoltaics as a distinct category eligible for accelerated permitting under the designation of "renewable acceleration areas." France's 2024 agrivoltaic decree establishes specific technical requirements: panels must be at least 1.1 meters above ground for row crops and 2.1 meters for livestock grazing, and the system must demonstrate that agricultural production remains the primary land use. These regulatory frameworks are transforming agrivoltaics from a niche experiment into a defined asset class.

Key Concepts

Agrivoltaic system configurations: The three primary designs used in European pilots are elevated fixed-tilt structures (panels mounted 2 to 5 meters above ground on steel or aluminum frames), dynamic tracking systems (panels that rotate to optimize the balance between crop light needs and energy generation), and vertical bifacial arrays (east-west oriented panels installed between crop rows). Sun'Agri's dynamic system at Tresserre uses algorithms that adjust panel angles every 15 minutes based on real-time solar radiation, soil moisture, and crop phenological stage data.

Light management: Crops require different quantities and spectra of photosynthetically active radiation (PAR) at different growth stages. Shade-tolerant crops such as lettuce, spinach, berries, and certain grape varieties can maintain or even increase yields under 20 to 40% shade conditions, particularly in hot climates where excess solar radiation causes photoinhibition and heat stress. The Tresserre pilot measured PAR transmission of 60 to 75% depending on panel angle, which proved optimal for the Grenache and Syrah grape varieties grown on site.

Dual revenue modeling: The economic viability of agrivoltaics depends on stacking multiple revenue streams. These include electricity sales (either through feed-in tariffs, power purchase agreements, or self-consumption), crop revenue, carbon credits from avoided land conversion, and in some jurisdictions, specific agrivoltaic subsidies. France's CRE (Commission de Regulation de l'Energie) introduced a dedicated agrivoltaic tariff in 2024 at EUR 0.085 per kWh for systems under 3 MWp, approximately 15% above the standard ground-mount tariff, reflecting the higher structural costs.

What's Working

The Tresserre vineyard pilot has produced three years of operational data that validate the dual-use model under real agricultural conditions. Grape yields averaged 6.2 tonnes per hectare across the 2023 to 2025 growing seasons, compared to 6.5 tonnes per hectare on adjacent unshaded parcels, representing a yield reduction of less than 5%. During the July 2023 heatwave, when temperatures exceeded 42 degrees Celsius for six consecutive days, the shaded vines maintained leaf water potential of -1.0 to -1.2 MPa versus -1.5 to -1.8 MPa on unshaded vines, indicating significantly lower drought stress. Irrigation water consumption on the agrivoltaic parcels was 15 to 20% lower than on control plots during the same period (Sun'Agri, 2025).

Germany's APV-RESOLA project at Lake Constance, operated by Fraunhofer ISE, has demonstrated similar crop protection effects at a 194 kWp pilot installation over organic wheat, potatoes, celery, and clover-grass. Winter wheat yields under the elevated panels were 82 to 97% of control plot yields depending on the year, but in the drought-affected 2022 season, agrivoltaic wheat yields were actually 3% higher than unshaded wheat due to reduced evapotranspiration (Fraunhofer ISE, 2024). The project's 5-meter mounting height allows combine harvester access beneath the panels, addressing one of the primary concerns about mechanized farming compatibility.

In Italy, the utility Enel Green Power launched its first agrivoltaic project near Catania, Sicily, in 2023, combining a 7 MWp tracking system with citrus and olive cultivation across 14 hectares. Initial results from the 2024 growing season show that orange yields on the shaded parcels matched or exceeded unshaded controls, which Enel attributes to reduced heat stress during Sicily's extreme summer temperatures. The project generates electricity at a levelized cost of EUR 0.045 to 0.055 per kWh, competitive with conventional ground-mount installations despite 15 to 20% higher structural costs (Enel Green Power, 2025).

Austria's Guntramsdorf pilot, led by Wien Energie, Vienna's municipal utility, deployed a 1.1 MWp agrivoltaic system above potato and soybean fields in 2023. Wien Energie reports that the system produces approximately 1,100 MWh per year while agricultural yields remain within normal variance ranges. The utility uses the project to supply renewable electricity to 350 households in the municipality, directly linking local food production to local energy production in a model it calls "Energie vom Feld" (energy from the field).

What's Not Working

Structural costs remain the primary economic challenge. Agrivoltaic mounting structures cost EUR 0.15 to EUR 0.30 per watt more than conventional ground-mount racking due to higher clearance requirements, heavier steel framing for agricultural equipment loads, and more complex foundation engineering. For a 5 MWp installation, this translates to EUR 750,000 to EUR 1.5 million in additional capital costs. Several French developers have reported that projects under 1 MWp struggle to achieve bankable returns without subsidy support, limiting the technology's accessibility for smaller farming operations (ADEME, 2025).

Crop selection limitations narrow the addressable market. High-light-demand crops such as maize, sunflower, and sugar beet show yield reductions of 15 to 30% under agrivoltaic shade conditions, making them economically unviable for dual-use systems at current electricity prices. The commercially proven crop list remains relatively short: vineyards, berry fruits, leafy greens, medicinal herbs, and some tree crops. Fraunhofer ISE estimates that only about 25 to 30% of European agricultural land area grows crops compatible with agrivoltaic shading, though research into shade-adapted crop varieties could expand this over time.

Permitting complexity has slowed deployment in several EU member states. In Spain, agrivoltaic projects must satisfy both energy and agricultural regulators, with overlapping and sometimes contradictory requirements. A 2024 survey by SolarPower Europe found that average permitting timelines for agrivoltaic projects were 18 to 24 months, roughly 6 to 9 months longer than conventional ground-mount solar, due to the additional requirement for agronomic impact assessments. Italy requires a minimum 70% agricultural land use maintenance ratio but has not yet published standardized assessment methodologies, leaving project developers to negotiate requirements on a case-by-case basis with regional authorities (SolarPower Europe, 2024).

Maintenance access creates operational friction. Panel cleaning, inverter servicing, and electrical inspections must be coordinated with farming activities including planting, spraying, harvesting, and livestock movements. The Tresserre project experienced two incidents in 2024 where vineyard tractor movements damaged cable conduits running between panel rows, requiring repairs costing EUR 8,000 to EUR 12,000 per incident. Developers are now routing all cabling through elevated trays or buried conduits at minimum 1-meter depth to prevent recurrence.

Insurance and financing structures remain underdeveloped. Most agricultural insurers do not have standardized products for agrivoltaic operations, and many exclude damage to solar equipment from standard farm policies. Similarly, solar project lenders are unfamiliar with agricultural revenue risk, while agricultural lenders do not typically assess energy project economics. This financing gap forces developers to structure agrivoltaic projects as either primarily solar (sacrificing agricultural optimization) or primarily agricultural (undersizing the energy component), rather than optimizing both uses simultaneously.

Key Players

Established Companies

• Sun'Agri (France): Pioneer in dynamic agrivoltaic systems with algorithm-driven panel tracking; operates 15+ pilot sites across France covering vineyards, orchards, and market gardens
• Enel Green Power (Italy): Deploying agrivoltaic capacity across southern Italy and Spain as part of its broader 12 GW European solar pipeline
• BayWa r.e. (Germany): Developer of the Heggelbach agrivoltaic research farm in partnership with Fraunhofer ISE; expanding into commercial-scale projects in Germany and the Netherlands
• EDF Renouvelables (France): Co-developer of the Tresserre pilot and multiple 5 to 20 MWp agrivoltaic projects in Occitanie and Provence regions

Startups and Innovators

• Next2Sun (Germany): Specializes in vertical bifacial agrivoltaic systems for grassland and livestock operations; installed 50+ MWp across Germany and Austria
• Ombrea (France): Develops smart shade structures for high-value crops using movable louvers; raised EUR 10 million in Series A funding in 2024
• Insolight (Switzerland): Produces translucent solar panels that transmit specific light wavelengths for crop photosynthesis while capturing the remainder for electricity generation

Investors and Public Funders

• European Innovation Council (EIC): Funded multiple agrivoltaic research projects through the Horizon Europe program totaling EUR 45 million between 2022 and 2025
• ADEME (France): Provides capital grants covering 20 to 40% of agrivoltaic system costs for qualifying projects under the France 2030 investment plan
• KfW (Germany): Offers concessional financing for agrivoltaic installations through its renewable energy program at rates 1 to 2% below market

Action Checklist

• Conduct a crop-solar compatibility assessment for existing agricultural operations, prioritizing shade-tolerant crops (vineyards, berries, leafy greens, medicinal herbs) that maintain >85% yield under 25 to 40% shade
• Commission a site-specific irradiance and shading simulation using tools such as PVsyst or Fraunhofer's APV simulation model to optimize panel height, spacing, and tilt angle for the target crop
• Engage both energy and agricultural regulators early in project development to identify permitting requirements and timelines, particularly the agronomic impact assessment methodology accepted by the local authority
• Structure the project to stack revenue streams: electricity sales (PPA or feed-in tariff), maintained crop revenue, potential carbon credits, and applicable agrivoltaic subsidies
• Design mounting structures with minimum clearance of 2.1 meters for livestock or tractor access, and route all electrical cabling through elevated trays or buried conduits at minimum 1-meter depth
• Establish baseline agricultural productivity data for at least 2 growing seasons before installation to enable credible before-and-after yield comparisons
• Negotiate integrated insurance coverage that addresses both solar equipment risk and agricultural production risk under a single policy framework
• Install soil moisture sensors, PAR sensors, and microclimate monitoring stations to generate the agronomic data required for regulatory compliance and ongoing system optimization

FAQ

Q: What is the minimum viable project size for an agrivoltaic installation to be economically viable without subsidies? A: Based on current European cost structures, projects above 3 to 5 MWp can achieve unsubsidized returns in the range of 6 to 9% IRR when sited on high-value crops such as vineyards or berry fruits in regions with strong irradiance (>1,400 kWh/m2/yr) and electricity prices above EUR 0.06 per kWh. Below 3 MWp, the fixed costs of grid connection, permitting, and specialized mounting structures typically require subsidy support of 15 to 25% of capital cost to achieve bankable returns. France's dedicated agrivoltaic tariff and Germany's EEG bonus for agri-PV systems are currently the most significant subsidy mechanisms in Europe.

Q: How do agrivoltaic systems perform during extreme weather events? A: Heatwave performance is the strongest documented benefit: shaded crops consistently show 15 to 30% lower water stress and 10 to 20% reduction in irrigation requirements during heat events. Hail protection is a secondary benefit, with agrivoltaic structures serving as physical barriers that have prevented crop damage in documented events in France and Italy. However, wind loading is a design concern: elevated structures must be engineered for regional wind speeds (typically 120 to 150 km/h design load in southern Europe), and several early installations experienced panel detachment during mistral wind events due to insufficient structural margins. Snow loading in northern European installations requires steeper panel tilt angles (35 to 45 degrees) to enable snow shedding, which reduces agricultural land coverage efficiency.

Q: Can agrivoltaic systems be installed on existing solar farms to add agricultural use, or must they be purpose-built? A: Retrofitting conventional ground-mount solar farms for agricultural use is technically possible but rarely economical. Conventional racking systems have panel heights of 0.5 to 1.5 meters, far too low for most crops or livestock access. Raising panels requires complete racking replacement at costs similar to new installation. Purpose-built agrivoltaic systems designed from the outset for dual use are the practical approach. However, some conventional solar farms have successfully introduced sheep grazing beneath existing low-mounted panels without structural modification, generating modest additional revenue of EUR 200 to EUR 500 per hectare annually from grazing lease payments.

Q: What agronomic monitoring data do European regulators typically require? A: France's 2024 agrivoltaic decree is the most detailed regulatory framework and requires: annual reporting of crop yields compared to a reference parcel or historical baseline, soil moisture and quality monitoring, documentation that the agricultural activity remains the "primary use" of the land (typically interpreted as >80% of pre-installation crop revenue maintained), and PAR measurements confirming that crops receive sufficient light. Germany's requirements are less prescriptive but the EEG agri-PV bonus requires proof of continued agricultural use. Italy requires maintenance of 70% of the agricultural production capacity but standardized assessment protocols are still under development at the regional level. Projects should plan for annual third-party agronomic audits costing EUR 5,000 to EUR 15,000 per site.

Sources

• Fraunhofer ISE. (2024). Agrivoltaics: Opportunities for Agriculture and the Energy Transition. Freiburg: Fraunhofer Institute for Solar Energy Systems.
• Sun'Agri. (2025). Dynamic Agrivoltaics: Three-Year Performance Report from the Tresserre Vineyard Pilot. Montpellier: Sun'Agri SAS.
• Enel Green Power. (2025). Agrivoltaics in Southern Europe: First Operational Results from Sicily and Andalusia. Rome: Enel Green Power S.p.A.
• SolarPower Europe. (2024). Agrisolar Best Practices Guidelines: Version 2.0. Brussels: SolarPower Europe.
• ADEME. (2025). Agrivoltaisme en France: Bilan des Projets Pilotes et Perspectives de Deploiement. Paris: Agence de la Transition Ecologique.
• European Commission. (2024). REPowerEU Progress Report: Solar Energy Deployment and Land Use Assessment. Brussels: European Commission Directorate-General for Energy.
• Wien Energie. (2024). Energie vom Feld: Agri-PV Pilotprojekt Guntramsdorf Jahresbericht. Vienna: Wien Energie GmbH.