C-DRONE GUIDE · 20 AUGUST 2026
Green hydrogen production site drone inspection: electrolysers, storage, ATEX, price
Electrolysers, high-pressure storage racks, compressors, distribution stations: the green hydrogen sector is multiplying sites across France, driven by the national decarbonised-hydrogen strategy and the France 2030 investment plan. These are also environmentally classified installations (ICPE), operating in an explosive atmosphere, where a fatigued weld or a loosened flange carries a fire or explosion risk that regulation frames strictly. Sending a technician up close to every at-risk component for a visual check is neither fast nor always advisable. The drone documents most of that inspection from a safety distance agreed with the HSE department, never entering zone 0 or zone 1. Here is what it inspects, the ATEX framework to respect, and the prices (excl. VAT) observed in 2026.
Published on 20 August 2026, reviewed on 20 August 2026 — regulations in force as of August 2026.
A site to document without getting close
Gaseous hydrogen ignites across an exceptionally wide concentration range in air - roughly 4 to 75% by volume, against 5 to 15% for methane - with a very low minimum ignition energy and a flame that is nearly invisible in daylight. On a production site, this reactivity combines with equipment under heavy pressure: 350 to 700 bar for storage and distribution, against a few dozen bar for a conventional natural-gas network. The risk is not theoretical: a study by Kun Tian and co-authors, published in 2026 in a specialised journal, ran the first systematic modelling of accident scenarios at a large-scale hydrogen refuelling station and showed that lethal thermal radiation can extend up to 25 metres and explosion overpressure up to 104 metres in the most severe scenarios (see the study on Google Scholar).
These magnitudes justify a simple rule: keep the time people spend right next to electrolyser skids, storage racks and high-pressure valving to the strict minimum. The drone answers exactly that need: within a few minutes of flight it covers the whole visible envelope of an installation - casings, elevated piping, the electrolyser building's roof, vents - without a technician having to approach for a simple visual check. It is the same stand-off logic as refinery flare-stack inspection or hydrocarbon storage-tank inspection, applied to a sector whose number of sites is growing fast in France.
What the drone documents: electrolysers, storage, piping
The typical mission combines three layers. First, a high-definition visual survey of electrolyser skids, storage tube racks, compressors and their supports: corrosion, condition of the anti-corrosion coating, loosened bolting, leak traces at flanges and nozzles. Then a thermal pass, useful for spotting abnormal heating on a compressor, an insulation defect on a nearby cryogenic line, or a coolant leak on the electrolysers' cooling circuit - the same technique used in our industrial drone thermal imaging missions. Finally, on the largest sites, a photogrammetric survey produces a georeferenced 3D model of the installation, comparable over time and directly usable to document ATEX zones on a plan - a digital twin built with the same method as our drone surveying and photogrammetry service.
Onboard leak detection is progressing fast for industrial gases: a study by Tassielli, Cananà and Spalatro, published in 2025 in Sustainability, developed and field-validated a tunable laser spectrometry system carried by a drone to quantify methane leaks from several controlled flow rates (see the study on Google Scholar). The same sensor architecture is starting to be adapted for hydrogen: an onboard gas-detection payload is, today, still a specialised option, to be reserved for missions where it is explicitly requested - but it shows the direction aerial inspection of these sites is heading.
Flying in a hydrogen ATEX zone: the ICPE framework and operational practice
A hydrogen production or storage installation falls under the French nomenclature of environmentally classified installations (ICPE): heading 4715 for gaseous hydrogen storage above certain thresholds, heading 1416 for a distribution station, with general requirements set by the orders of 26 November 2015 and 22 October 2018, updated by decree no. 2024-667 of 2 July 2024. The site is also divided into ATEX zones (0, 1, 2 for gas risk) under EU directives 1999/92/EC and 2014/34/EU, which determine where equipment must be certified so as not to become an ignition source itself.
The flight is organised accordingly, in direct coordination with the site's HSE department and operator: the flyable zones and the safety distance to vents, purges and potential leak points are defined beforehand, the site's work-permit regime is respected, and the slot is chosen outside any unloading or purging operation. As with a hydrocarbon depot, the aircraft remains an electric aircraft kept at a distance from any emission source; it neither flies over nor hovers above a venting outlet. The surrounding airspace is checked on Géoportail, as these installations sometimes neighbour industrial zones with a specific status - the same vigilance detailed in our guide to gas transport pipeline monitoring. For a project under development, this same georeferenced aerial coverage also underpins the technical due diligence carried out before acquiring or financing a hydrogen production asset.
Prices observed in 2026 (excl. VAT)
Ranges observed in France in 2026, for a standard-size hydrogen production or distribution site:
- External visual inspection (skids, storage, electrolyser building roof, geolocated photo report): €1,200 to €2,800.
- Visual inspection + thermal imaging (compressors, piping, cooling circuits): €1,800 to €3,800.
- Full file - visual, thermal, photogrammetric 3D model for the hazard study and ATEX plan: €3,000 to €7,000.
- Onboard gas-detection option (specialised payload): on quote.
- Periodic multi-site monitoring programme (operator running several stations): on quote, with a campaign discount.
The price spread mostly reflects the site's size, the number of components to cover and the ATEX preparation required with the HSE department - never simple flight time. To scope a mission, the most effective step is to request a quote stating the type of installation (electrolysis, storage, distribution station), its ICPE classification, the area to cover and the goal (one-off check, hazard-study support, periodic monitoring).
Frequently asked questions
Can a standard drone fly inside a classified ATEX zone on a hydrogen site?
In practice, no - unless the aircraft is specifically ATEX-certified, which remains rare on the commercial drone market. The flight is prepared with the operator's HSE department: the aircraft stays out of zone 0 and zone 1, or works in zone 2 at an agreed safety distance, covering at-risk components with optical and thermal zoom rather than a direct approach.
Does the drone replace a hydrogen site's statutory hazard study?
No. It feeds the hazard study (HAZOP, quantitative risk assessment) and the prevention plan with imagery and a precise 3D model of the installation, but it does not substitute for the operator's own risk calculations or for the statutory checks on pressure equipment required under the PED directive.