Agrivoltaics: the expert guide to combining farming and solar generation
Agrivoltaics is rewriting the relationship between energy and farming. Codified by France's APER law of March 2023 and the implementing decree of 8 April 2024, it lets farmers generate solar electricity while improving — not displacing — their agricultural output. This guide covers the regulatory definition, technology families (raised fixed canopies, single-axis trackers, retractable greenhouses), economics, CDPENAF procedures, and VoltWatt's field experience on vineyards, livestock farms and arable land.
1. The legal definition of agrivoltaics in France
Agrivoltaics differs sharply from conventional ground-mounted PV. Article L. 314-36 of the Energy Code, introduced by the 2023 APER law, requires the installation to ‘sustainably contribute to the establishment, maintenance or development of agricultural production' and to deliver at least one of four agronomic services prescribed by decree.
The implementing Decree 2024-318 closed a long-running debate: pure ground-mounted solar on farmland no longer qualifies for support schemes, while agrivoltaics becomes a fully fledged legal status, supervised by the CDPENAF (Departmental Commissions for the Preservation of Natural, Agricultural and Forestry Spaces).
The distinction is not cosmetic. It governs eligibility for the feed-in premium, planning permission and grid connection. A plant that fails the agricultural-yield threshold over two consecutive years can have its tariff suspended.
The four mandatory agronomic services
To qualify, the project must deliver at least one main service — climate adaptation, hazard protection, animal welfare — or improve the underlying soil potential. These services must be quantifiable, monitored over the lifetime of the plant, and reversible upon decommissioning.
- Climate adaptation: thermal shading in Mediterranean zones, evapotranspiration control, temperature smoothing under tunnels.
- Hazard protection: hail, late frost, wind, excessive irradiance (orchards, market gardens, vineyards).
- Animal welfare: shelter for sheep, cattle and poultry, protection from heavy rain, thermal protection in feedlots.
- Soil potential: restoration of degraded land, prairie revival, trials supervised by a recognised technical institute (INRAE, ITAB, CTIFL).
Coverage ratio, height, spacing
The decree caps ground coverage at 40%. Above that, the project reverts to conventional ground PV with stricter planning rules. ‘Proven' technologies — recognised by decree after CDPENAF review — may exceed the cap if the developer demonstrates yield maintenance and machinery compatibility.
Minimum clearance is 2.5 m above ground for arable land and 4 m for tall vineyards or cattle farms. Inter-row spacing must allow the main agricultural machinery (tractor, harvester, livestock truck) to pass.
2. Technology families: from raised fixed structures to dynamic AVPV
Three technology families coexist on the French market, each fitting a specific agricultural use case. The choice drives sizing, performance and eligibility for support.
Raised fixed canopies
The most mature and lowest-cost option. Bifacial modules on hot-dip galvanised steel structures at 4–5 m height, fixed tilt, south or east-west orientation. Power-to-area ratio: 0.7–1.0 MWp/ha. Best fit for extensive sheep grazing, apple orchards and tall vineyards.
- CAPEX: €850–1,050/kWp.
- Performance ratio: 81–84%.
- Yield: 1,200–1,380 kWh/kWp/year in southern France.
- Service life: 30–35 years with a dedicated O&M contract.
Louvers and single-axis trackers (HSAT)
Ideal for vineyards, orchards and open-field market gardening. Modules are mounted on a horizontal rotating axis with –50° to +50° tilt. Agronomic control: the tracker can flatten during flowering to let light through, close to protect against heatwaves, and tilt to slow runoff after a storm.
This technology powered the agrivoltaic conversion of several AOC vineyards in Languedoc and Bordeaux. Decree 2024 explicitly recognises agronomic-driven control as an eligible service when sensors (soil moisture, temperature, lux) drive the orientation.
Two-axis trackers and retractable structures
For very high-value crops (exotic orchards, nurseries, intensive greenhouse market gardening), dual-axis or retractable structures finely modulate shading. Higher CAPEX (€1,300–1,600/kWp) is offset by 8–14% extra yield and premium agronomic protection. These technologies require dedicated CDPENAF instructions.
3. Project economics: revenue, sharing and returns
Agrivoltaics generates three distinct cash flows: occupancy royalty paid by the developer, agronomic gain (yield, water savings, fewer claims), and any electricity-value sharing under collective self-consumption or an agricultural PPA.
VoltWatt structures contracts on a 30-year horizon with an indexed floor rent and production-linked upside. Depending on the configuration, the farmer receives €1,800–4,200/ha/year, before agronomic gains. The range depends on irradiation zone (1 to 4), tariff secured (open window vs CRE auction), and construction complexity.
From the developer's perspective, the LCOE of a well-designed AVPV project sits between €58–72/MWh (7–9% pre-leverage IRR), well above bare ground (€45–55/MWh) but eligible for higher reference tariffs. The single most important bankability factor is the stability of the long-term emphyteutic lease or commodatum agreement.
4. Permitting timeline
A typical agrivoltaic project takes 18 to 36 months from land contract to grid connection. The critical path runs through five gates: agronomic baseline study, planning permission, CDPENAF clearance, Enedis or RTE connection, and commissioning with monitoring plan validation.
Planning permission is reviewed in parallel with the CDPENAF opinion. Decree 2024 clarified the deadlines: the commission has two months to issue a reasoned opinion; silence equals tacit consent. Pre-filing remains recommended to avoid late refusals on a missing piece.
- Months 0–6: land due diligence, agronomic baseline, technology choice.
- Months 6–12: environmental impact study, four-season ecology survey, CDPENAF memo.
- Months 12–18: planning permit, CRE auction filing or open window, financing.
- Months 18–30: grid connection, construction, agricultural footprint restoration.
- Month 30+: commissioning, annual yield monitoring, revenue sharing.
5. Field cases: VoltWatt on the ground
Agrivoltaics is not a lab concept. Across the 30+ projects VoltWatt has accompanied since 2021, three patterns dominate.
AOC vineyard in Languedoc — hail and heatwave protection
On 18 hectares of Royat-trained Grenache Noir, controllable louvers at 4.2 m delivered a 23% reduction in leaf temperature during the 2022 heatwave, and 14% irrigation savings over three seasons. The 200-metre control plot lost 12% yield while the AVPV plot held its volume. The grower receives €2,850/ha/year with a vintage-risk-sharing clause.
Dairy sheep farming in Aveyron
Across a 32-hectare paddock (220 Lacaune ewes), a fixed canopy at 4.5 m delivers 18% average shading, lowers thermal stress and increases pasture growth by 9% in dry season. The plant produces 26 GWh/year and stabilises the farm's gross margin via an indexed floor rent.
Mixed market gardening in Drôme
A 1.8-hectare retractable PV greenhouse covers a mixed crop (tomatoes, courgettes, lettuce). Agronomic control driven by soil moisture and lux extended the season by 22 days and cut antifungal treatments by 30%. Higher CAPEX is offset by dual revenue (direct sales + solar tariff), with an 11-year payback for the grower.
6. Six diligence points before signing
A poorly drafted promise of lease can stall a project for years. These are the six points VoltWatt systematically checks with the farmer's notary before any commitment.
- Planning compatibility (local PLU, national RNU, communal map) — a modified PLU stays opposable for seven years.
- CAP register status: keep CAP entitlements if the soil remains eligible.
- Tenancy regime: a rural lease requires the tenant's consent; emphyteutic lease or commodatum is preferable.
- Decommissioning commitment with financial guarantee (5% of CAPEX held in escrow).
- Sharing clauses on resale: VoltWatt grants a right of first refusal to the operator.
- Insurance for crop damage caused by the installation (snow load, excessive shading).
Frequently asked questions about agrivoltaics
- What is the difference between ground-mounted PV and agrivoltaics?
- Ground-mounted PV is built to produce electricity. Agrivoltaics is built first to serve farming (yield, animal welfare, hazard protection), with electricity as a co-benefit. The 2024 decree mandates annual yield monitoring against a control plot and a maintenance threshold; this monitoring does not exist for ground PV.
- How much does an agrivoltaic hectare pay the farmer?
- Between €1,800 and €4,200/ha/year of royalty paid by the developer, on top of the farming income kept by the operator. The range depends on tariff, irradiation zone and technology. Agronomic gains (protected harvest, water savings) and any electricity-sharing under collective self-consumption add to that.
- How long is the lease with VoltWatt?
- Thirty years, matching the economic life of a modern agrivoltaic plant (premium bifacial modules with 30-year warranties, 35-year structures). Decommissioning and land restoration are financially backed by an escrowed reserve from the day of commissioning.
- Are CAP subsidies preserved?
- Yes, provided farming actually continues and the project complies with the 2024 decree. A well-designed project keeps eligibility for the basic payment, the eco-scheme and the coupled livestock support. VoltWatt builds the file with the local Chamber of Agriculture to lock this in at feasibility stage.
- Can I undo the project if it does not work?
- Decree 2024 mandates full decommissioning and soil restoration at the end of the lease. The decommissioning reserve is ring-fenced from day one. During the lease, an amicable termination is possible subject to contractual compensation; VoltWatt always includes a 10-year review clause to adjust based on observed agronomic outcomes.
- How is the control plot computed?
- The control plot must share the same agronomic conditions (soil, exposure, cropping) and lie within 5 km. Annual monitoring compares yield in quintals/ha (crops) or kilograms of meat/ha (livestock). If the equipped plot drops below 90% of the control for two consecutive years, the farmer must adjust the cropping pattern or the operator must adjust the control logic.
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