Utility Inspection Companies: What to Look For

Most people searching for utility inspection companies are trying to work out who to engage, not what a drone is. So this piece is written as an evaluation guide: the questions worth asking any aerial provider, what a good answer sounds like, and where the honest limits of aerial inspection sit. It should be useful even if you end up engaging someone else.

The short version. Aerial inspection is a fast, low-risk way to capture condition evidence on assets that are elevated, energised or spread over kilometres — powerlines, poles, towers, substations, tanks, bridges, culverts. What you are buying is data capture and delivery. The condition assessment belongs to a qualified engineer, linesman or asset specialist, and any provider who blurs that line is worth a second look.

What to look for when evaluating utility inspection companies

CASA certification, and the specific approvals your job needs

Start here, because it is the easiest thing to verify and the most commonly fudged. Commercial drone operations in Australia sit under CASA. A provider should hold a remote pilot licence, and for commercial work beyond the sub-2kg excluded category, operate under a Remotely Piloted Aircraft Operator’s Certificate (ReOC). Ask for the certificate number and the name it is issued to.

Then get specific about your job, because a general licence is not the same as approval for the flight you need:

• Controlled airspace. Many substations, depots and water assets sit near an aerodrome or under controlled airspace. That needs an approval or coordination arrangement, not just a licence.
• Close proximity to structures and people. Standard operating conditions include separation distances from people not involved in the operation. A pole on a suburban nature strip, or a tower in an operating yard, usually means managing the area or operating beyond standard conditions under an ReOC.
• Beyond standard operating conditions. Night flight, extended visual line of sight and operating above the standard height limit each require their own approval. If a provider shrugs at this, that is your answer.
• Asset owner requirements. Separate from CASA — see below.

Ask them to describe how they will handle your site’s specific constraint. A capable operator answers with a process. A vague one answers with reassurance.

Insurance and public liability

Ask for a certificate of currency for public liability, and check the sum insured suits the assets you are putting them near. A drone striking a conductor, a transformer or a moving vehicle is a low-probability, high-consequence event, and that is what the cover is for. Confirm it extends to third-party property damage and to any consequential loss the asset owner requires. Many network operators and councils set their own minimum, so check yours before you shortlist.

Documented flight planning and risk assessment

This is the difference between an operator and a bloke with a drone. Expect a site-specific plan before anyone flies: airspace check, hazard identification, exclusion zones, weather minimums, emergency and lost-link procedures, and an agreed abort trigger. For utility work it should also cover conductor clearance, electromagnetic interference near high-voltage infrastructure, and what happens if the aircraft loses positioning near a structure.

You do not have to read every page. You do have to confirm it exists in writing — it is the document that gets asked for after an incident, and the one your own safety team will want on file.

Is the imagery georeferenced, and can the capture be repeated?

For a one-off look at a single defect this matters less. For asset management it matters enormously. Georeferenced imagery means every frame carries a position, so a fault is not “somewhere on the third span” but a coordinate you can hand to a crew. Repeatable capture means the same flight path, altitude and camera settings can be flown again in twelve months, so this year’s images compare honestly with last year’s.

Ask directly: will each image carry positional metadata, will that metadata survive delivery, and can you fly this again the same way? Compressed, stripped or renamed files are a common and quiet failure.

Do you get the raw data, or only a PDF?

Ask this before you sign anything. A PDF report is a summary; the underlying imagery is the evidence. If your engineer later wants to zoom into a fitting, re-check a thermal reading, or hand the file to an insurer, a flattened export will not do it.

What you want on delivery: full-resolution stills with metadata intact, radiometric thermal files where thermal was captured (not just colourised JPEGs — radiometric files retain per-pixel temperature data your specialist can re-analyse), a manifest of what was captured, and a methodology note recording date, time, conditions and equipment. Confirm you own the data outright and can pass it to third parties, and how long they retain a copy.

Which utility and infrastructure assets suit aerial inspection

• Powerline, pole and conductor visual inspection. Drone powerline inspection captures pole-top hardware, insulators, cross-arms, conductor condition, vegetation encroachment and span clearance from angles the ground cannot reach. Linear assets are where aerial pulls furthest ahead of a truck and a pair of binoculars.
• Substation and switchyard thermal. Loose or corroded terminations, unbalanced phases and failing joints run hot under load. Thermal from above covers a whole yard without anyone entering an exclusion zone. Equipment must be under meaningful load at capture or a fault will not show.
• Communication towers. Antenna alignment and mounting condition, structural fittings, corrosion, lightning protection, cable and waveguide runs — captured without a climb.
• Water infrastructure. Tank and reservoir roofs, external shell condition, treatment plant assets, weirs and open channels — otherwise a rope or platform job.
• Bridges and culverts. Deck, soffit, abutment, headwall and scour condition, including approaches and waterway obstruction after a flood event.
• Council and general infrastructure. Depots, drainage assets, retaining structures, hardstand and lighting columns, captured as a dated record for the asset register.

The safety and cost argument, plainly

The comparison is not aerial inspection versus doing nothing. It is aerial inspection versus the method you would otherwise use.

No elevated work platform. No tower climb. No working-at-height permit for a first look. No traffic management to get a boom into position on a live road. And for a purely visual inspection, no line shutdown — nothing enters the exclusion zone.

The cost argument follows from that. The drone is rarely the expensive part of an inspection; the access is. Removing the platform, the crew, the permit and the outage removes most of the cost, and the coverage rate on linear assets means kilometres in a day rather than spans in an hour. Where aerial does not save money is on assets that need to be touched — a torque check, a test, or hands on the fitting still needs a person there.

Working near live electrical infrastructure

This has rules beyond CASA. Asset owners and network operators set their own requirements for work near live conductors: minimum approach distances, permits, induction, notification, safety observers and sometimes an escort. Those requirements vary by network, by voltage and by asset class, and they are not negotiable by the drone operator.

The practical implication: confirm early who grants access, what they require, and how long approval takes. That approval, not the flight, is usually the longest lead item.

Where our work ends

We capture and deliver inspection-grade imagery and thermal data, with faults located and mapped, metadata intact, and the capture conditions recorded. A qualified engineer, linesman or asset specialist makes the condition assessment and any rectification decision.

We do not perform electrical testing, structural assessment or certification. The division is deliberate: it keeps each side inside its own competence, and it is why asset teams engage us as the data layer underneath their report rather than as a competitor to it.

Frequently asked questions

What should I ask utility inspection companies before engaging one?

Ask for their CASA remote pilot licence and ReOC details, a public liability certificate of currency, and the specific approvals your site needs — controlled airspace, close proximity, or beyond standard operating conditions. Then ask what you receive on delivery: full-resolution georeferenced imagery and radiometric thermal files, or only a PDF summary.

Can a drone inspect powerlines without shutting off the power?

For a visual or thermal inspection, generally yes — the aircraft stays outside the approach distance and nothing enters the exclusion zone. Thermal inspection actually requires the equipment to be energised and under load to reveal hot connections. Access approvals still come from the asset owner or network operator, whose requirements vary.

Is drone powerline inspection accurate enough to replace a ground inspection?

It complements rather than replaces. Aerial capture gives angles and coverage a ground inspection cannot, particularly pole-top hardware and conductor spans. Anything requiring physical contact — a torque check, an electrical test, a fitting replacement — still needs a crew on site. Aerial narrows where they need to go.

Do I get the raw imagery or just a report?

Confirm this in writing before engaging anyone. We deliver full-resolution stills with metadata intact and radiometric thermal files where thermal is captured, plus a manifest and methodology record. A flattened PDF cannot be re-analysed later, which matters when your engineer or insurer wants another look.

Do you assess the condition of the asset?

No. We capture and map the evidence — faults located, imagery georeferenced, conditions documented. The condition assessment, defect classification and rectification decision are made by a qualified engineer, linesman or asset specialist. We do not perform electrical testing, structural assessment or certification.