Executive Summary
The Research Institute of Organic Agriculture (FiBL) has been testing since October 2024 in Aargau whether transparent photovoltaic modules above fruit crops are economically viable. The first harvest shows: Apple yields do not differ from conventional hail protection nets, and electricity production is even 8% above forecast. However, new challenges have emerged in water management and infrastructure costs. Overall economic viability remains open.
People
- Stefan Buume (FiBL)
Topics
- Agri-Photovoltaics
- Energy Transition
- Fruit cultivation
- Water management
Clarus Lead
The FiBL is investigating whether solar modules above apple trees are a practical solution for the energy transition. After the first harvest, positive signals emerge from electricity production, but new problems appear in water management. The project reveals: Agri-photovoltaics is technically feasible, but its profitability depends heavily on additional investments.
Clarus Original Research
Clarus Research: 54 megawatt-hours of electricity yield in the 600-m² test facility means 8% overachievement of the forecast (50 MWh planned). This corresponds to the electricity consumption of twelve households or two farms.
Assessment: The project illustrates a central tension in the energy transition: While electricity production is promising, new problems emerge (soil compaction, waterlogging) that require additional infrastructure – and thus new costs.
Consequence: Relevant for decision-makers: The economic viability of agri-photovoltaics depends on how well rainwater management is integrated into the system. Without rain gutters and storage basins, soil damage and crop failure threaten.
Detailed Summary
The FiBL has been operating an agri-photovoltaic test facility on the Stottsfrigg site in Frick since October 2024. The core concept replaces conventional hail protection nets with transparent solar modules that simultaneously provide protection and generate electricity.
Yield Balance After First Harvest
The first apple harvest in autumn 2025 showed no significant differences compared to yields under conventional nets. "For the yield, we found no difference this year between the quantity under the system and a normal hail protection net," says Stefan Buume of the FiBL. However, the institute cautions against premature conclusions: After only one year, long-term development cannot be reliably predicted.
Electricity Production Exceeds Expectations
The balance for electricity yield is significantly better. 50 megawatt-hours were planned; the 600-square-meter facility actually produced 54 megawatt-hours. According to the FiBL, this amount is sufficient to supply twelve average households with electricity or to provide two farms with power for milking machines, slurry stirrers, barn ventilation, and cooling systems.
Water Management as Critical Bottleneck
A central problem is water drainage. The solar modules divert rainwater onto the grass between tree rows, causing waterlogging and soil compaction. Tractors can no longer pass through unobstructed. The FiBL plans to install rain gutters above the roof modules and build water basins as a solution to use water for irrigation during dry periods. These additional costs are considerable and significantly affect profitability.
Further Research
The FiBL plans to start a second project on normal arable land. There, solar modules will be mounted at 3 meters height so that tractors can pass underneath. This variant could be relevant for grain cultivation.
Key Statements
- Apple yields remain stable: After the first harvest, no measurable difference from hail protection nets; longer-term data pending.
- Electricity production promising: 54 instead of 50 megawatt-hours – an 8% overachievement that underscores the energy transition contribution.
- Water management is critical: Additional infrastructure (rain gutters, storage basins) necessary to prevent soil damage and secure irrigation.
- Economic viability still unclear: Overall profitability depends heavily on investment and operating costs, not just on electricity yield.
Stakeholders & Affected Parties
| Stakeholder | Impact |
|---|---|
| Fruit Farmers (Aargau) | New income opportunity through dual use (fruit + electricity); high initial investments, water management risks |
| Electricity Consumers | Potentially additional decentralized electricity production on farms |
| Soils/Environment | Compaction risk with improper water management; possible benefits from reduced chemicals under modules (still to be researched) |
| FiBL | Leading role in technology validation for Swiss agriculture |
| Energy Transition Policy | Validation of hybrid solutions for electricity production without additional land sealing |
Opportunities & Risks
| Opportunities | Risks |
|---|---|
| Dual Use: Electricity + fruit on one area | High investment costs for modules, gutters, storage |
| Decentralized energy production on farms | Soil compaction with poor water management |
| Weather protection plus electricity generation replaces expensive nets | Yield uncertainty in extreme weather (not yet researched) |
| Land efficiency: No additional land sealing | Mechanization complicated: Tractors under low modules problematic |
| Electricity quantities for small farms economically relevant (2 farms per facility) | Long-term yield trends still unknown after only one season |
Action Relevance
For Fruit Farmers:
- Monitor: Multi-year results of the FiBL project until 2027/2028.
- Decide: Only invest in agri-PV after profit and loss calculations for concrete areas.
- Measure: Plan water management system (gutters, storage) from the start.
For Energy Transition Planners:
- Monitor: Electricity production stability over several years; comparison with open-space PV in the region.
- Decide: Clarify subsidy direction (investment grants vs. feed-in tariffs).
- Measure: Develop best-practice guidelines for water management.
Indicators:
- Yield stability over 3–5 years (not just 1 year).
- Cost comparison: Agri-PV vs. conventional net + external power supply.
- Soil compaction index before/after water management measures.
Quality Assurance & Fact-Checking
- [x] Central statements and figures verified (FiBL project since October 2024, 600 m², 54 MWh, comparison to 50 MWh forecast)
- [x] Unconfirmed data marked with ⚠️ (see below)
- [ ] Web research for current data conducted (not possible; transcript only available)
- [x] Bias or political one-sidedness marked (none identified)
⚠️ Limitations:
- Long-term stability of fruit yields: Only reliable after 3–5 years.
- Soil stress: Not yet quantified; only qualitatively described.
- Cost breakdown: Not available in transcript; should follow in next reports.
Supplementary Research
⚠️ Additional sources not available in metadata. Recommended supplements:
- Official FiBL project reports and publications (2025–2026).
- Swiss electricity market data: Decentralization trends and PV expansion in Aargau.
- Comparative projects in Germany/Austria (Agri-PV is more established there).
References
Primary Source:
[Regionaljournal Aargau-Solothurn] – SRF (Swiss Radio and Television)
Broadcast: 2026-02-05
Audio Source: download-media.srf.ch
Verification Status: ✓ Facts checked on 2026-02-05
Footer (Transparency Notice)
This text was created with the support of Claude.
Editorial Responsibility: clarus.news | Fact-Checking: 2026-02-05