Drone inspection is the career path that gets advertised least and moves the most annual contracts. It does not show up in viral videos because its end product is a report, not a pretty image. But it is where a trained pilot stops charging for one-off jobs and starts having a season.
The reason is easy to understand: what the drone replaces here is not a camera, it is a person sixty metres up, a hired elevating platform or a production stoppage. When the client compares the cost of one against the other, the decision makes itself.
This article explains what work there really is in Spain, what gets delivered in each case, which sensor rules and what training the sector demands. It is aimed at someone choosing a specialisation, not at someone looking to hire an inspection.
The inspection season is booked now
Photovoltaic thermography, wind turbine shutdowns and post-storm surveys are planned months ahead. Whoever arrives trained at the start of the season gets into the round of bids.
The five jobs that hold the sector up
Solar farms
This is the largest volume today and the one that has grown most with the solar rollout in Spain. The plant is flown with a thermal camera and the modules running at anomalous temperatures are located: hot spots, activated bypass diodes, entire strings down. What used to be a technician walking hectares with a handheld camera is now resolved in a morning of flying.
The deliverable is not the thermal video: it is the list of faulty modules with their exact position within the field, so the maintenance crew goes straight to them.
Wind turbines
Blade inspection looking for leading-edge erosion, delamination, cracks and lightning damage. It is the best paid job on the list and also the most demanding: you have to fly close to an enormous structure, in wind, with the machine stopped, which means every minute of inspection costs the client production.
Flying skill genuinely matters here.
Power lines
Checking pylons, insulators, clamps and conductors, plus monitoring the vegetation corridor beneath the line. These are kilometres, not points: the job looks more like a corridor than an object. When the stretch is long, the work pushes towards flight beyond visual line of sight, and that changes the legal regime completely.
Civil works: bridges, dams, viaducts
Inspecting elements you cannot reach without expensive auxiliary means. The drone documents the state of the concrete, joints, bearings and the underside of the deck. The job often arrives combined with a survey, because the client wants the condition and the geometry.
Roofs and buildings
The most accessible job to start with, and the one with the most volume in number of clients even if less in billing per job: residents’ associations, industry, insurers. Damp detection by thermography, checking roofs without climbing onto them, assessing damage after a storm. We explain it in more detail in drone roof inspections.
The sensor matters more than the drone
In inspection, the aircraft is a mount. What defines the job is what hangs off it:
- Radiometric thermal camera. The key to photovoltaics and to damp. Radiometric means every pixel stores its temperature, and that is what lets you issue a defensible report instead of a picture with colours in it.
- Visual camera with optical zoom. Essential on wind turbines and power lines: it lets you see the detail without bringing the drone close to the structure.
- Multispectral. Less common here, more typical of agriculture, though it shows up in vegetation control beneath power lines.
And there is a practical consequence worth taking on board before spending money: thermography has capture conditions. A photovoltaic inspection requires a minimum irradiance threshold, clear skies and a temperature and wind range. Flying outside those conditions does not give you a worse report, it gives you an invalid one. Knowing how to say «we are not flying today» is part of the trade.
The product is not the flight, it is the report
This is the fundamental difference with film work and it is worth being clear about before choosing this branch: nobody here pays you for the images. They pay you for a conclusion that a maintenance decision can be based on.
An inspection report the client can actually use has, as a minimum:
- Unambiguous identification of each defect: which element it is, exactly where it is —row and position in the solar field, pylon number, blade and distance from the root— and how to get to it.
- Severity classification, so the client knows what to fix this week and what can wait for the next shutdown.
- Evidence: the thermal and the visual image of the same point, with the capture data.
- Inspection conditions: date, time, ambient temperature, wind and, for photovoltaics, irradiance. Without those, a thermal measurement is not defensible.
- Comparison with the previous inspection where one exists. That is what turns a one-off service into an annual contract.
That last point explains the entire business model. The first inspection is sold on price; the second sells itself, because the client wants to know whether the defect flagged last year has got worse. Whoever delivers comparable reports keeps the account.
How it gets contracted
Rarely by flight hour. The norm is a price per unit inspected —per megawatt of plant, per wind turbine, per kilometre of line, per square metre of roof— with the season agreed in advance. That has two consequences: you need to estimate daily throughput well so the quote does not lose you money, and you need the capacity to repeat visits if the weather forces you to abort a day.
What the legal side requires
Practically no serious inspection fits in the open category. The reasons repeat themselves: you have to approach structures, overfly installations with people working, cover long distances or fly in industrial environments. That is specific category.
The usual route is the operational declaration under a European standard scenario, with the caveat this year brought: since 1 January 2026, declarations under the national STS-ES scenarios are no longer valid. That leaves STS-01, for flight within visual line of sight over a controlled area in a populated environment with a C5 class drone, and STS-02, for flight beyond visual line of sight with observers in a sparsely populated environment with a C6 class. In both cases the pilot needs the STS theoretical knowledge certificate from AESA.
For long power lines, where BVLOS flight is almost unavoidable, the scenario gets more complicated and many operations end up requiring an operational authorisation with a risk assessment rather than a declaration. That is where UAS permit management stops being an extra and becomes the bottleneck of the project.
Add the usual: registration as a UAS operator —set out in how to register as a UAS operator— and civil liability insurance.
And something that is not aeronautical but will be demanded of you
Industrial clients have their own access rules. Coordination of business activities, occupational risk prevention training, protective equipment, internal work permits, sometimes sector-specific accreditations for electrical work. AESA asks for none of that: the client does, and without it you do not get into the plant even with every aeronautical paper in order.
It is the point that most surprises people coming from film work, and it explains why in this sector the client relationship takes longer to open and then lasts for years.
What gets paid for is the report, not the flight
Interpreting a thermal image and writing something that holds up against a claim is the part that separates an inspector from a pilot. It is the core of the course.
What training you need
Three layers, in this order.
The aeronautical one. Open category base and, above all, the STS certificate. Without it, most of the jobs on this list are legally out of your reach. It is covered in the professional drone pilot course and in the STS certifications course.
The sensor and report one. Interpreting a thermal image, understanding emissivity and reflection, knowing which pattern corresponds to which fault, and writing a report that holds up against a claim. This layer is what really separates an inspector from a pilot, and it is the core of the technical inspections course.
The flying-near-structures one. Flying within metres of a blade or a pylon, with magnetic interference, shifting wind and no reliable GPS at some points. That is learned with practice, not theory.
Why September is a good moment to decide
The inspection calendar has its own seasonality. Photovoltaic thermography campaigns concentrate in the months with good irradiance; wind campaigns take advantage of low-wind windows and scheduled shutdowns; roof work spikes after storms. Whoever arrives trained at the start of the season gets into the round of bids; whoever arrives halfway through waits for next year.
If you are not sure whether this specialisation is yours or another fits you better, in which drone course you need depending on what you want to do all ten are compared. And if you come from industrial maintenance, energy or occupational risk prevention, tell us: half the training you already have, and the route changes.
If you come from maintenance, energy or risk prevention, the route changes
- ✓Training approved by AESA
- ✓Real flight practice, not just theory
- ✓In-person classes in Madrid
- ✓We tell you which route fits you, no strings attached
Would you rather we guided you first? Tell us your goal
