$90 million.
One generating unit. Around 500 additional specialist contractors.
Stanwell has started a major statutory overhaul of Tarong Power Station Unit 3, launching a $90 million maintenance program that will run through spring and mobilise a substantial specialist workforce into the South Burnett.
The 350MW generating unit is offline while teams undertake detailed inspections, maintenance, refurbishment and replacement of plant and equipment.
For Queensland’s industrial contractor market, the distinction is important:
this is active work already inside its outage window.
BBI Project Watch graphic. Stanwell commenced the $90M Unit 3 overhaul on 21 August 2026.
Overhaul Wire
$90M active overhaul21 August to 6 November 2026350MW Unit 3Around 500 additional contractors$10M South Burnett contributionElectriciansBoilermakersRiggersFittersWelders$90M active overhaul21 August to 6 November 2026350MW Unit 3Around 500 additional contractors$10M South Burnett contributionElectriciansBoilermakersRiggersFittersWelders
Overhaul Pulse
Active work, compressed schedule and hundreds of specialist maintenance tasks.
$90MOverhaul Program
350MWGenerating Unit
~500Additional Contractors
~$10MRegional Contribution
Why this matters to industry
A major generating-unit overhaul compresses inspection, repair, replacement and commissioning into a tightly controlled outage — concentrating specialist labour and industrial services in one active workfront.
Unit 3 is offline — and the overhaul clock has started
Stanwell commenced the planned Unit 3 overhaul on 21 August 2026.
The company’s published maintenance schedule identifies a statutory outage window running through to 6 November 2026.
Tarong Power Station contains four 350MW generating units.
Stanwell says each unit at the Tarong power stations undergoes a major overhaul approximately every four years as part of the planned maintenance regime used to maintain safety, performance and long-term reliability.
Unit 3 follows the completion of the Unit 1 overhaul earlier in 2026.
What the $90M represents:
the figure is Stanwell’s overall planned investment in the Unit 3 overhaul.
It is not the value of one construction contract or one subcontract package.
Stanwell describes the program as including detailed inspections, maintenance, refurbishment and replacement of plant and equipment.
The outage window is measured in weeks, not years
Major power-station overhauls differ from conventional capital projects because substantial volumes of work need to be completed while the generating unit is deliberately offline.
That puts pressure on sequencing.
Access has to be established.
Plant has to be isolated and opened.
Internal components need to be inspected.
Repair decisions have to be made quickly.
Equipment then has to be reassembled, tested and safely returned to service.
Unit 3 statutory outage
21 August → 6 November 2026
Planned overhaul window
01 — IsolateUnit shutdown, permits, plant isolation and safe work access.
02 — InspectEquipment opened, measured, tested and condition assessed.
03 — ExecuteMaintenance, repair, refurbishment and component replacement.
04 — ReassemblePlant reinstatement, equipment alignment and system restoration.
05 — ReturnTesting, commissioning and controlled return to service.
Once the unit is opened, inspection can change the worklist
BBI editorial illustration of major generating-unit overhaul activity. It is not presented as verified current site photography.
Inspection drives scope
What is found after equipment is opened matters
Statutory overhauls create access to plant and internal components that cannot be fully inspected during normal operation.
Findings can determine whether individual components are returned to service, repaired, refurbished or replaced.
This is one reason outage schedules depend heavily on inspection quality, engineering decisions, parts availability and disciplined coordination between trades.
Which part of the overhaul market does your business serve?
Large generating-unit maintenance brings several specialist disciplines together at once.
Select a workstream below to see where each capability fits into the overhaul cycle.
Mechanical maintenance
Open, inspect, repair, rebuild and return major plant to service
Fitters, boilermakers, welders and specialist mechanical teams can support maintenance across rotating equipment, pressure systems, piping, valves and other plant requiring inspection, repair or refurbishment during the outage.
Electrical & controls
Maintain the systems that power, monitor and control the unit
Electrical equipment, motors, field instrumentation, control systems, protection, cabling, testing and calibration can all form part of the wider maintenance and return-to-service effort.
Access & lifting
Specialist maintenance cannot happen if crews cannot safely reach the plant
Scaffolding, rigging, cranes, lifting equipment and insulation removal can become critical enabling services around large equipment, confined workfronts and components requiring removal or replacement.
Asset integrity
Inspection supports the decision to repair, monitor or replace
NDT, weld inspection, dimensional inspection, pressure-equipment assessment and other condition checks can provide the evidence needed before plant is cleared for another operating cycle.
Twelve specialist workfronts behind a major power-station overhaul
01
Mechanical maintenancePlant inspection, overhaul, repair and refurbishment.
02
Turbine & generatorSpecialist rotating-equipment inspection and maintenance where required.
03
Pressure equipmentCondition assessment, inspection and maintenance of pressure-containing plant.
04
Valves & pipingRemoval, inspection, refurbishment, replacement and reinstatement.
05
Electrical maintenanceEquipment inspection, motors, cabling, distribution and testing.
06
InstrumentationField instruments, controls, calibration and functional testing.
07
NDT & inspectionWeld inspection, condition assessment and material testing.
08
ScaffoldingTemporary access around inspection, maintenance and repair workfronts.
09
InsulationRemoval and reinstatement around plant requiring maintenance access.
10
Rigging & cranesMajor equipment movement, lifting and maintenance access.
11
Welding & fabricationRepairs, replacement components and maintenance modifications.
12
Testing & commissioningVerification and controlled return of maintained plant to service.
Contractor-market context:
these capability areas describe disciplines associated with major power-station overhauls and the types of inspection, maintenance, refurbishment and replacement work confirmed by Stanwell.
They should not be interpreted as confirmation that every listed scope is currently available as an open Tarong tender.
Around 500 additional specialists show the real scale of the outage
~500
Additional tradespeople and technical contractors
The temporary workforce expands substantially during a major overhaul
Stanwell says around 500 additional tradespeople and technical contractors are needed during each Tarong overhaul.
The publicly identified workforce includes electricians, boilermakers, riggers, fitters and welders working alongside the existing Tarong team.
ElectriciansBoilermakersRiggersFittersWelders
The scale of that mobilisation is commercially important.
Major outages do not simply add labour.
They also increase demand for tooling, lifting equipment, transport, accommodation, consumables, supervision, inspection and supporting services.
The overhaul also becomes a South Burnett economic event
~$10M
Estimated regional contribution
Contractor mobilisation reaches beyond the power-station gate
Stanwell estimates each major Tarong overhaul contributes around $10 million to the local economy.
The company identifies local procurement and increased spending across accommodation, hospitality, transport and other services as key channels for that regional activity.
ContractorsSpecialist maintenance and technical services.
TransportPeople, freight, tooling and materials need to move.
Local businessHospitality and other regional spending increases.
Why major overhauls keep returning every four years
Stanwell describes major overhauls as a planned and essential part of operating the Tarong power stations safely and reliably.
The work is also statutory, with the generating units required to undergo major maintenance within defined timeframes.
Safety
Inspect plant that cannot remain indefinitely in service without major intervention
Planned outages provide controlled access to equipment and systems requiring detailed assessment.
Reliability
Address defects before they become operating failures
Repair and refurbishment work supports future availability and performance of the generating unit.
Asset life
Reset major equipment for its next operating cycle
Components can be repaired, refurbished or replaced before the unit returns to service.
That is why the commercial profile is different from routine maintenance:
more plant is opened, more specialists are mobilised and more work is compressed into one defined window.
BBI Project Watch Assessment
Active maintenance can be more valuable to contractors than a much larger conceptual project
$90 million may look modest beside billion-dollar infrastructure announcements.
The important difference is timing.
Unit 3 is already offline.
The overhaul has started.
Hundreds of additional specialists are required through the maintenance program.
Inspection, repair, refurbishment and replacement activity is being delivered inside a statutory outage window ending in November.
For industrial contractors, that can make an active $90 million overhaul far more commercially relevant than a much larger proposal still waiting years for approvals or investment.
The strongest exposure sits around mechanical maintenance, electrical work, access, rigging, inspection, welding and return-to-service activity.
The second-order impact then reaches accommodation, transport, hospitality and regional procurement throughout the South Burnett.
What industry should watch through the overhaul
Major inspection findings
Additional repair scope
Rotating-equipment maintenance
Pressure-equipment repairs
Valve refurbishment
Piping repairs
Electrical work
Instrumentation work
Scaffolding demand
Rigging and crane activity
NDT and QA/QC
Welding requirements
Reassembly milestones
Commissioning
Unit 3 return to service
South Burnett regional spend
Contractor question
On a major generating-unit overhaul, which workfront usually becomes the biggest schedule pressure point?
Disclaimer:
Bowen Basin Index provides project, maintenance, procurement and industry information based on publicly available information current at the date of publication.
Stanwell announced on 21 August 2026 that a planned $90 million major overhaul of Tarong Power Station Unit 3 had commenced.
Stanwell’s published maintenance schedule identifies the planned major statutory overhaul period for Unit 3 as 21 August to 6 November 2026.
Tarong Power Station comprises four 350MW generating units.
The $90 million figure represents Stanwell’s overall planned investment in the Unit 3 overhaul and should not be interpreted as the value of a single contractor award, subcontract package or open tender.
Stanwell states that the overhaul includes detailed inspection, maintenance, refurbishment and replacement of plant and equipment to support the safe, efficient and reliable operation of Unit 3.
Stanwell states that around 500 additional tradespeople and technical contractors are needed during each Tarong overhaul, including electricians, boilermakers, riggers, fitters and welders.
The approximately 500-person figure should not be interpreted as 500 currently advertised vacancies or guaranteed new recruitment positions. Personnel may be supplied through existing contractors, service providers and established commercial arrangements.
Stanwell estimates that each major Tarong overhaul contributes approximately $10 million to the South Burnett economy through local procurement and increased spending across accommodation, hospitality, transport and other services.
The approximately $10 million figure is an estimated broader regional economic contribution and should not be interpreted as a dedicated local-contracting fund or procurement pool.
References in this article to turbine and generator work, pressure equipment, valves, piping, electrical systems, instrumentation, NDT, scaffolding, insulation, rigging, cranes, welding, fabrication and commissioning describe capability areas associated with major generating-unit maintenance and the types of inspection, maintenance, refurbishment and replacement activities described by Stanwell.
Bowen Basin Index is not stating that every listed workstream is presently available as an open Tarong tender or subcontract package.
Actual workfronts, scope boundaries, package values, contractor appointments, procurement methods, prequalification requirements and supplier opportunities should be confirmed directly with Stanwell or the relevant appointed contractors.
Major-overhaul schedules and return-to-service dates may change in response to inspection findings, additional maintenance requirements, safety considerations or operational conditions.
BBI editorial graphics used in this article are illustrative unless specifically identified as official project photography.
The opening and overhaul graphics should not be interpreted as verified photography of the current Unit 3 outage, final engineering documentation or confirmation that any company logo, worker uniform, equipment supplier or contractor depicted in an illustrative image is participating in the current Tarong Unit 3 overhaul.
Project information reviewed against Stanwell’s 21 August 2026 overhaul announcement and current Tarong Power Station maintenance schedule — 23 August 2026.
