The question
Our gas-fired power plant only runs at full load on hot summer afternoons, and crews climb the stacks and piping by hand before every peak, so could drones inspect the high equipment between peaks without shutting down?
The short answer
Partly, yes. Drones can survey gas plant stacks and high pipe racks between peaks, giving visual and thermal records without a crew climbing, but they do not replace hands on contact checks or internal inspection. Stack interiors and boiler work still need the unit offline and cooled, and any flight near a running stack needs a planned exclusion zone and a Part 107 certified pilot. Start with a pilot flight on one stack, compare the images with your last climb record, and decide on contact tasks from there.
Key takeaways
- Drones can cut many climbs on stacks and high pipe racks, mostly for visual and thermal records.
- Internal boiler and stack work still needs an offline, cooled unit and a person on the structure.
- Between peaks is often your offline window, so schedule flights there before any work near a running unit.
- Falls remain the leading cause of serious construction injuries, so every climb you remove has real value.
- Part 108 was not final in the latest report we found, so plan around Part 107 rules today.
Can drones inspect gas plant stacks between peaks without a shutdown?
For most gas plants, drones can take over the visual and thermal part of stack and high pipe rack inspection, and they can do it between peaks. They cannot take over every task a climbing crew does today. A drone gives you a repeatable record of the stack shell, flanges, insulation, pipe supports and the top of the stack, without a person on a ladder or a rope. That is the work that puts crews at height and uses up the hours you need when demand spikes.
The question has two parts, and they get different answers. The between peaks part is a scheduling question. According to the U.S. Energy Information Administration, peaking units run infrequently and for short periods to meet peak demand, so there is usually a stretch when the unit is offline or lightly loaded. The without shutting down part depends on what you need to see and how close the drone must fly to hot exhaust. A flight around a running stack is a different job from work inside a stack or boiler.
Treat the drone as a way to get the crew off the structure for most surveys, and keep the climb for work that needs a hand on metal. The simplest first step is one pilot flight on one stack, scheduled in an offline window, with the images compared against what the crew found on the last climb.
What can a drone actually see on a stack and high pipe racks?
Drone surveys are good at visual condition. They show corrosion staining, cracked or missing insulation, damaged supports, loose cladding, debris at the top of the stack, and the general state of pipe racks seen from the side and below. Thermal cameras can show hot spots and gaps in insulation. These are the findings a supervisor uses to decide what to climb for, so the drone can cut the number of climbs even when it cannot remove them all.
Some work has gone further. According to a 2019 vendor report, a drone fitted with an ultrasonic probe measured steel plate thickness on a 160-meter chimney at a thermal plant in Japan, and the report said the method avoided scaffolding and shortened the inspection. It is one job reported by the company that flew it, so treat it as proof that the method can work, not as a benchmark for your stack.
Drones also reach places a crew cannot easily get to. A technical review from a Japanese power equipment maker describes a drone for locating boiler tube leaks without installing scaffolding, and notes that it could suit indoor sites without satellite positioning. That is useful for finding where to work, but a locator points a repair crew at the leak. It does not make the repair.
Which inspections still need a person on the structure?
Contact measurements are the main limit. Plate thickness, weld examination, bolt and support tightness, and some corrosion tests need a probe or hands on metal. A drone can carry a probe only in narrow cases, with a trained operator and the right payload. Plan a crew for every point where the result depends on touch, not only on a picture.
Internal work is the second limit. Stack interiors, boiler flues and tube banks are confined, hot and often without satellite positioning. A Ukrainian utility announcement describes a caged drone with cameras and an infrared sensor, and says internal chimney inspections that once took days now take hours. That is a corporate statement without a published method, so confirm the approach and the outage window before you count on the same savings.
Review time is the hidden cost. A drone produces many images that someone has to check against the last climb record. Name a qualified reviewer, not only a pilot, and agree in advance what counts as a finding that needs a climb. Otherwise the drone saves the climb and adds a pile of images nobody reads.
- Height exposure
Drone
Pilot stays on the ground for stack and rack surveys
Staff
Crew climbs and works at height, with fall protection
- Visual coverage of stack shell and high racks
Drone
Repeatable images from several angles, saved for comparison
Staff
Sees fine detail up close, but coverage depends on the climb plan
- Contact thickness and weld checks
Drone
Limited to narrow cases, needs a probe payload and a trained operator
Staff
Direct, proven method with the probe in hand
- Internal stack and boiler work
Drone
Possible only in narrow cases, often without satellite positioning
Staff
Standard for confined work, once the outage and cooldown are in place
- Work near a hot running stack
Drone
Needs an exclusion zone and a flight path clear of the exhaust
Staff
Also needs controls, but a trained crew can judge conditions on site
- Judgment on odd findings
Drone
Flags anomalies, but a reviewer must decide what they mean
Staff
Can touch, probe and decide on the spot
- Night or poor light
Drone
Thermal and lighting limits, so check the payload before night work
Staff
Needs lighting and fall protection at night
- Records
Drone
Every image time stamped and stored for the next survey
Staff
Notes depend on the crew writing them down
Do you have to shut the unit down first?
It depends on how close the drone flies to the hot part of the plant. A running stack gives off hot exhaust and a plume, and the air around it is turbulent and hot. For surveys of high pipe racks and supports away from the exhaust path, a flight during a low load period may be workable, but that decision belongs to your operations team and the unit's own procedures, not to the drone crew.
Between peaks is usually the easy case. If the unit is offline for the stretch, the drone can fly the stack and racks without changing operations at all. Because peaking units run infrequently and for short periods, many plants have long quiet stretches where this is possible. Schedule the survey early in the first of those stretches, and let the unit cool before any person or drone goes near interior areas.
Scope changes the shutdown question. A visual survey can often fit into a window already set for other work. An internal inspection or a contact test may need its own outage, because access and cooling set the timing. Ask for both windows in the plan before you compare the drone schedule with the crew's timing today.
How much climbing risk does a drone actually remove?
Falls are the main reason supervisors want work moved off structures. According to a U.S. Department of Labor enforcement release reported in November 2024, fatal falls investigated by federal OSHA fell from 234 to 189 in FY2024, a drop of almost 20 percent. The same reporting said falls remain the leading cause of serious construction injuries and deaths.
Those are construction figures, not power generation figures. Our search did not find OSHA or Bureau of Labor Statistics data for power generation workers, so do not read the drop as a plant rate. Use your own incident and near-miss log for the climbs you do now, and compare it again after a full year of drone surveys.
A drone removes exposure for the surveys it replaces, and that is the part you can count. It does not remove the climb for contact work, and it does not remove the staging, ladders and rope access that the remaining climbs still need. Write the new scope so each climb that remains has a named reason on paper.
What are the flight rules at a gas plant?
Under FAA rules, Part 107 and the recreational statute generally do not permit flight over people or moving vehicles. Since April 21, 2021, Part 107 pilots can fly over people under conditions tied to the drone's category. A plant has workers, contractors and vehicles on its roads, so the flight plan needs an exclusion zone, a ground crew role, and a check of who is inside the flight area on the day.
Flights beyond visual line of sight generally still need a waiver. Executive Order 14307 set a 240-day deadline for that rulemaking, which fell about February 1, 2026, and was not met. According to a secondary report dated September 16, 2026, the final Part 108 rule was still under White House review with no publication date, and the FAA said it hopes to publish before year end. Check the Federal Register before you commit, since the status may have changed.
State and local privacy laws can apply even when the federal rules are met. Check your state's rules on recording, especially if the stacks sit near a public road or a neighboring property. Your site security policy may also limit what can be recorded and where, and that policy should be agreed before the first flight.
How should a survey fit around peak season?
Plan the survey as a short project with a fixed window and a clear stop rule. Pick one stack and its nearby racks for the first flight, set the weather and wind limits in your written procedure, and agree with operations on the moment the drone must land if the unit is called to load. A call to bring a unit up on a hot afternoon should end a survey without debate.
Keep new flights out of the forecast peak. Surveys in the weeks before a summer peak can find defects that matter at full load, and the images give the crew a target list for the next climb. Do not schedule drone work on the afternoon of a forecast peak, even if the unit is offline, because the crew and the control room will be busy.
Store every image and note with the time, the unit's load state and the weather. That record lets you compare a survey between peaks with the climb record you keep today, and it shows the next crew which findings have already been checked.
How does a drone survey program start with us?
We are a commercial robot integrator for US businesses, and we are vendor neutral. We pick the right robot for the site across manufacturers, then lease it through financing, deploy and integrate it, train your staff and service it under our maintenance service plan. One partner and one number from site assessment to go live support, so your team does not manage several vendors for one survey route.
For a gas plant, the first step is a free site assessment. We map the stacks, pipe racks, exclusion zones and access points, and check the flight rules that apply to your site. The lease is quoted after that assessment, so you do not commit to a unit before we know the survey fits your stacks. We can begin with one leased unit and a pilot flight, then expand only if the images match your climb records.
After go live, service covers on-site dispatch, remote triage and emergency response nationwide, so a unit that fails between peaks does not leave you without a survey route. Training covers flight procedures, data handling and review, and works alongside your certified pilots. We do not replace your Part 107 certification or your plant's own permits, and the assessment will say so if your site needs another approach.
What evidence is still missing for gas plants?
Most drone evidence comes from vendors and utilities working on chimneys, boilers and substations, and it reports time saved in general terms. Our research did not find a published measure of outage hours saved at a gas plant from drone inspection. Treat any hour figure you hear, including ours, as a claim to test against your own timed trial.
Government data supports the case for fewer climbs and a steady inspection routine. According to the U.S. Energy Information Administration, as reported in trade press, 11 new gas-fired plants with 5.5 GW came online in 2022, so the number of units needing inspection keeps rising. Those figures do not show how much a drone saves at any one plant, but they show the base of units that need a survey routine is growing.
The test that matters is your own. Run one stack for a full season and log four things: the climbs the drone replaces, the climbs it does not, the review time, and any finding a crew caught that the drone missed. Those records will tell you more than any vendor claim.
Frequently asked questions
Want a drone at your gas-fired power plants?
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Sources
- Terra Drone, 2019 chimney inspection at a thermal power plant in Japan
- Mitsubishi Hitachi Power Systems technical review on boiler tube leak drone
- DTEK announcement on drone inspection of chimneys and boilers
- T&D World, EPRI flight tests on drone outage restoration
- Claims Journal, report on U.S. Department of Labor falls enforcement release, November 2024
- U.S. Energy Information Administration, Today in Energy on peaking units
- Power Engineering, EIA on U.S. natural gas-fired plant additions
- UAV Coach, Part 108 status report