C-DRONE GUIDE · 25 JULY 2026
Agrivoltaics: drone monitoring of crops and panels, method and price
Agrivoltaics — photovoltaic panels installed above crops or pasture, without replacing them — now has a strict legal framework in France: the APER law of 10 March 2023 defined it, and its implementing decree of 8 April 2024 requires agricultural production to remain the plot's main activity, with notably a coverage rate capped at 40% for unproven technologies and farm yield maintained against a control zone. In other words: the operator of an agrivoltaic plant must now prove, year after year, that the crops under the panels are producing. This dual monitoring — panel condition on one side, crop vigour on the other — is a mission made for drones, which carry both required sensors in a single flight. Here is how it works and what it costs in 2026.
Published on 25 July 2026, reviewed on 2 August 2026 — regulations in force as of August 2026.
An obligation of proof born of the 2023 law
Before 2023, nothing legally distinguished a ground-mounted plant sitting on grassland from a genuine agrivoltaic project. France's renewable energy acceleration law (APER) settled it: to qualify as agrivoltaic — and benefit from the associated regime — an installation must provide a service to the plot (protection against weather hazards, improved agronomic potential, animal welfare…) and guarantee significant agricultural production with a sustainable income for the farmer. The decree of 8 April 2024 quantified the requirement: yield maintained against a panel-free control zone (with limited tolerance), capped ground coverage, end-of-life dismantling, and periodic controls whose findings can go as far as revoking the authorisation.
The concept itself comes from agronomic research: the founding study published in 2011 in Renewable Energy by Dupraz, Marrou, Talbot, Dufour, Nogier and Ferard — the Montpellier INRA team that coined the term "agrivoltaic" — modelled the combination of panels and crops and showed that proper sizing could raise the plot's overall productivity by 35 to 73% compared with separating the two uses (see the study on Google Scholar). Fifteen years on, verifying that balance has become a regulatory obligation.
One flight, two monitoring tasks: crops and panels
On the crop side, the multispectral drone maps vigour (NDVI and related indices) under and between the panel rows, and above all compares it with the control zone required by the decree: same sensor, same flight, same date — a methodologically clean comparison. The techniques are those of precision agriculture: stress zone detection, emergence heterogeneity, localised shading effects the operator can correct (tracker steering, species choice). For livestock schemes, the flight complements herd monitoring under the panel canopies.
On the panel side, the same flight (or a second pass with a thermal camera) applies the standard methods of solar farm thermography: hot spots, disconnected strings, soiling — with one constraint specific to agrivoltaics, the height of the structures and the possible presence of animals, which demand a careful flight plan. The combined deliverable (vigour map + thermal report) feeds both the regulatory agronomic report and the plant's maintenance.
Who orders the monitoring, and under what flight rules
Three parties may order the work: the energy company, responsible for the periodic reports sent to the authorities; the farmer, who wants objective data on the panels' effect on yields (and documentation for any dispute); and control bodies (chambers of agriculture, agencies, mandated consultancies). In all three cases, identical flight data serves different readings — hence the value of contracting a stable protocol: same key dates in the crop cycle, same flight plans, same indices computed, year after year.
On the aviation side, an equipped farm plot remains ordinary rural terrain: open-category flights most of the time, operator registered on AlphaTango, a check of restricted zones — many large installations sit next to aerodromes or low-altitude military training areas. Consent from both the farmer and the energy company is essential, the structures being private assets under surveillance.
The price of drone agrivoltaic monitoring in 2026
Pricing is built per hectare for the multispectral part and per installation for the thermal part. Orders of magnitude observed in France in 2026:
| Service | Observed price (excl. VAT) |
|---|---|
| Multispectral mapping (crops + control zone) | €10 to €20/ha, mission minimum €500 to €800 |
| Panel thermography (same visit) | +€400 to €900 depending on installed capacity |
| Typical combined campaign (20 to 50 ha, 2 sensors) | €1,200 to €2,500 per visit |
| Annual protocol (3 to 4 visits at key growth stages) | €3,000 to €7,000/year |
| Equipped zone / control zone comparative report | included to +€600 depending on analysis depth |
Set against the stakes — an authorisation that can be challenged if farm production drops, and a plant where every faulty string produces less — drone monitoring remains marginal in an agrivoltaic installation's operating account. For upkeep, our guide on drone panel cleaning completes the picture.
Frequently asked questions about agrivoltaic monitoring
Is the drone enough to prove farm yield is maintained? No: the regulatory proof rests on harvested yields and agronomic reports. The drone makes the in-season comparison with the control zone objective and documents the file.
Can you fly over panels with animals underneath? Yes, with a flight plan that limits direct overflight and disturbance — the same precautions as livestock monitoring.
At what stages should an agrivoltaic plot be flown? Typically emergence, full vegetative growth and pre-harvest, plus a thermal pass over the panels during a high-sun period.
Does NDVI measure the panels' cast shadow? Indirectly: it reveals the effects of the panels' micro-climate on vigour, which helps adjust tracker steering or crop choice.