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Bowen Basin Index

PCL Joins 2.5GW Bulli Creek Energy Park as 1,700MWh Battery Takes Centre Stage

By Bowen Basin Index

Project Watch ECI Agreement Strategy Reset Solar + BESS Millmerran · Queensland
Hybrid redesign · pre-FID delivery watch

1,700MWh changes the project.
PCL is back — but this is not the same Bulli Creek.

Genex Power has executed a new Early Contractor Involvement agreement with PCL Construction for Bulli Creek 1, the first stage of the broader up to 2.5GW Bulli Creek Clean Energy Park about 45 kilometres south-west of Millmerran.

The important part is not simply that PCL has returned. The project PCL is helping to optimise is materially different from the earlier Bulli Creek Stage 1. What was previously a 775MW standalone solar proposal is now a hybrid first stage comprising 300MW solar PV plus a 425MW / 1,700MWh four-hour battery energy storage system.

Genex says the ECI phase will focus on design optimisation, delivery methodology, construction planning and commercial readiness, helping position BC1 for a targeted final investment decision and construction commencement in CY2028.

Bulli Creek has not simply “added a battery.” Stage 1 has been commercially and technically reset — and the 1,700MWh storage block now changes the contractor mix, the grid strategy and the road to FID.
BBI Project Watch editorial artwork for Bulli Creek 1 showing 300MW solar, 425MW 1700MWh BESS, PCL early contractor involvement and the wider 2.5GW clean energy park
BBI Project Watch editorial artwork — the current milestone is an Early Contractor Involvement agreement, not a final EPC award or construction authorisation.
Current project position
Revised hybrid configuration endorsed · PCL ECI executed · grid process progressing · FID and construction targeted for CY2028
Fresh development · late Aug / early Sep 2026
Project Pulse BBI’s read: storage has moved from supporting role to centre stage. That changes which contractors matter, when they matter and what needs to be solved before FID.
2.5GWBroader Energy Park
300MWStage 1 Solar
425MWBESS Power
1,700MWhBESS Energy
2028Target FID / Build
BBI Strategy Flip The same site. A very different Stage 1 commercial and engineering proposition.
Earlier Stage 1 775MW standalone solar

PCL had previously been positioned as preferred EPC contractor for the older solar-heavy configuration. The delivery story centred on large-scale solar generation and its associated civil, module, tracker and electrical systems.

→ Strategy reset
Current BC1 300MW solar + 425MW / 1,700MWh BESS

The solar component is smaller, but the four-hour battery introduces a much larger storage, HV, controls, fire-safety, fixed-equipment and commissioning layer.

The number that changes the delivery story is 1,700MWh

BBI 4-Hour Battery Explainer 425MW is the power rating. 1,700MWh is the energy capacity. Together they describe roughly four hours of rated discharge.
425MW × 4h = 1,700MWh
Hour 1 425MWh One hour at 425MW rated output represents about one quarter of the stated energy capacity.
Hour 2 425MWh The second hour takes cumulative theoretical discharge to roughly 850MWh.
Hour 3 425MWh By hour three the illustrative cumulative energy reaches about 1,275MWh.
Hour 4 425MWh Four hours at rated power corresponds to the announced 1,700MWh storage figure.
Simplified rating explanation only. Actual dispatch, usable state-of-charge window, efficiency, degradation, operating reserve and grid-service behaviour will depend on the final BESS design and operating strategy.
BBI strategy comparison artwork showing Bulli Creek Stage 1 changing from 775MW standalone solar to 300MW solar plus 425MW 1700MWh four-hour battery storage
BBI strategy artwork — the first-stage architecture has shifted from solar-heavy generation to a hybrid solar-and-storage project.
Why the reset matters

The new configuration changes economics, grid behaviour and construction complexity at the same time

Genex says BC1 was reconfigured to better align with changing Queensland market conditions and reduce project risk. The revised configuration received formal endorsement in April 2026.

The battery adds the ability to store renewable energy and dispatch it later, rather than relying only on real-time solar output. Genex also says the project is intended to provide system-strength capability to the grid.

For BBI readers, that is the commercial reason the contractor market should look at Bulli Creek differently: the project is now as much about electrical infrastructure, storage integration and grid performance as it is about building a solar field.

Open the Bulli Creek switchboard

Interactive · Project Switchboard Choose the lens that matters to your business
Strategy reset BC1 is a redesigned project, not simply an updated contractor appointment.

The earlier 775MW standalone solar concept has been replaced by 300MW solar plus a 425MW / 1,700MWh BESS. Genex says the shift is intended to better match changed Queensland market conditions and lower project risk.

Less standalone solarStage 1 solar reduces from the earlier 775MW concept to 300MW.
Much more storageA four-hour 1,700MWh battery becomes a central asset rather than an optional add-on.
New development pathThe revised configuration required the grid process to restart and shifted the target construction window.
Early Contractor Involvement PCL is helping shape how BC1 could be built — but the announcement is not yet the final EPC award.

Genex says PCL will work collaboratively on project design, delivery methodology, construction planning and commercial readiness. PCL’s previous work on the older Bulli Creek configuration gives it existing knowledge of site conditions and earlier delivery planning.

DesignConstructability and hybrid-layout optimisation before FID.
MethodologyHow solar, BESS, HV and logistics interfaces are physically sequenced.
Commercial readinessImproving cost, risk and package clarity before the investment decision.
Scope multiplier The battery adds major packages that would barely exist in a solar-only build.

A 425MW / 1,700MWh BESS introduces fixed-equipment foundations, container or enclosure systems, power conversion, transformers, switchgear, controls, communications, fire systems, thermal management, protection and integrated commissioning.

Heavy electricalPCS, transformers, switchgear, cables, protection and HV interfaces.
Safety systemsFire detection, suppression, emergency controls, spacing and access.
CommissioningBattery, solar and grid systems must ultimately operate as one coordinated plant.
Pre-FID constraint Genex says the revised configuration required the grid process to restart.

That is a major reason the construction target shifted to CY2028. The project may have land and existing approvals in place, but the revised hybrid configuration still needs to advance through grid, design, commercial and investment gates before full construction mobilisation.

Connection studiesRevised generation and storage behaviour must fit the network and connection requirements.
Commercial bankabilityRevenue, equipment, capex and delivery risk need to support FID.
Package maturityFinal scope division and major equipment strategy remain critical future signals.
Supplier lens The useful question is not “are all tenders open?” — it is “which capabilities should get visible before FID?”

Genex’s project page states that BC1 will prioritise local content during construction and operations. For regional firms, the pre-FID window is therefore relevant for capability registration, head-contractor engagement and positioning ahead of package release.

Regional servicesPlant hire, fuel, fencing, security, waste, accommodation, catering and site support.
Construction tradesCivil, concrete, electrical, cabling, mechanical, cranes, logistics and testing capability.
SpecialistsBESS fire, controls, protection, HV commissioning and grid-integration support.

PCL’s ECI sits in the middle of a much bigger gate sequence

BBI Gate Map This is the sequence contractors should follow — because each gate increases package certainty
Done
Project resetRevised hybrid configuration endorsed
BC1 is now formally being advanced as 300MW solar plus 425MW / 1,700MWh BESS.
Now
Delivery definitionPCL Early Contractor Involvement
Design, constructability, methodology, sequencing and commercial readiness are being developed before FID.
Now
NetworkRestarted grid process
The revised configuration must progress through a new grid-development pathway before the project reaches construction readiness.
InvestmentFinal Investment Decision
FID is the major commercial trigger separating today’s development work from committed construction expenditure.
Future
ExecutionConstruction mobilisation
Genex currently targets commencement of construction in CY2028, subject to the project reaching the required grid and commercial milestones.
Contractor watch

The 1,700MWh BESS is where Bulli Creek broadens beyond the traditional solar contractor market

Solar still carries a substantial construction footprint: earthworks, access roads, piling, tracker systems, modules, DC collection, inverters, MV reticulation and field commissioning.

But the BESS creates a second construction ecosystem around battery foundations, power-conversion systems, transformers, high-voltage switchgear, protection, SCADA, fire systems, communications, heavy logistics and integrated commissioning.

That means BC1 can ultimately touch a much wider supplier base than the earlier standalone-solar configuration — particularly electrical, controls, grid, safety and specialist energy-storage firms.

BBI contractor opportunity artwork for Bulli Creek 1 showing solar civil works, BESS foundations, HV electrical, transformers, controls, fire systems, logistics and commissioning
BBI contractor-watch artwork — the hybrid configuration brings battery, HV, controls and commissioning disciplines into a project that was previously dominated by solar delivery.

Where is the contractor signal strongest today?

BBI Procurement Timing Matrix Now, pre-FID and post-FID — a practical read of where capability matters
Capability area
ECI / development now
Pre-FID definition
Post-FID delivery
Engineering / constructability
High relevance
Continues
Lower
Civil / earthworks / roads
Planning
Package definition
Major delivery
Solar modules / trackers
Watch
Selection / procurement
Installation
BESS integrator / battery system
Design input
Critical selection
Delivery + integration
Transformers / HV equipment
Design input
Long-lead watch
Install + energise
Controls / SCADA / protection
Architecture
Detailed integration
Commissioning
Regional services / workforce
Engagement
Mobilisation planning
High demand

Capability areas worth watching as BC1 matures

CivilBulk earthworksSite preparation, cut/fill, drainage, grading and pads across solar and BESS areas.
AccessRoads + heavy transportInternal access, culverts, laydowns and routes for battery containers, transformers and construction traffic.
SolarPiling + tracker systemsSolar foundations, tracker erection, module-field civil interfaces and installation.
ElectricalSolar DC + MV collectionDC cabling, combiner systems, inverters, MV reticulation and field electrical commissioning.
BESSBattery foundations + blocksEquipment pads, separation, drainage, cable interfaces and BESS installation support.
Power conversionPCS + transformersPower conversion, transformers, auxiliary systems and connection into the HV architecture.
HVSubstation + switchgearProtection, switchgear, power transformers, bus systems, cabling and grid interface works.
ControlsSCADA + communicationsPlant control, BESS management, protection, communications and dispatch interfaces.
SafetyFire + emergency systemsBESS detection, suppression, emergency response and associated safety infrastructure.
LogisticsHeavy haul + cranesBattery blocks, transformers, lifting, oversized transport and laydown support.
TestingEnergisation + commissioningElectrical testing, protection checks, functional testing and integrated solar/BESS commissioning.
RegionalSite services + local contentAccommodation, fuel, plant hire, fencing, security, waste, catering and regional support.

Stage 1 is only the first move in a much larger precinct

BBI Precinct View BC1 matters on its own — but it also sets a possible template for later development across the broader Bulli Creek Clean Energy Park.
Stage 1 · Current focus BC1 — 300MW solar + 425MW / 1,700MWh BESS This is the configuration currently being advanced toward FID and targeted CY2028 construction.
Future stage Stage 2 Genex’s May 2026 presentation indicated later stages may follow a similar hybrid solar-and-storage approach. Final configuration is not yet confirmed.
Future stage Stage 3 Part of the broader development pathway toward the Energy Park’s up-to-2.5GW planned capacity.
Future stage Stage 4 Longer-term precinct buildout remains subject to future market, grid, commercial and project-development decisions.
Regional contractor lens

The local-content story should be watched before construction, not after it starts

Genex’s current BC1 project page states that the project will prioritise local content during construction and operations. Genex is also committing up to $500,000 toward redevelopment of Domville Place in Millmerran as part of its wider community-benefits program.

For businesses across Millmerran, Toowoomba, the Western Downs and southern Queensland, the practical opportunity is to become visible to the project and its delivery partners while design and package strategy are still being refined.

Construction supportPlant, fuel, traffic, fencing, waste, accommodation, catering, security and general site services.
Trade capabilityCivil, concrete, electrical, mechanical, cranes, logistics, testing and specialist installation support.
Long-term servicesOperations, electrical maintenance, vegetation, site services and asset-support opportunities once commissioned.
BBI development pathway artwork for Bulli Creek 1 showing revised hybrid design, PCL ECI, grid process, FID and targeted 2028 construction
BBI delivery-watch artwork — ECI and grid progression sit between the 2026 strategy reset and the targeted 2028 construction start.
What does 2028 really mean?

The next 12–24 months are more likely to be defined by decisions than excavators

Genex says the revised project configuration required the grid process to restart, which moved the target construction start to CY2028.

That means the near-term signals BBI would watch are grid milestones, design maturity, BESS integrator selection, HV equipment strategy, commercial structure, final package boundaries and FID.

For suppliers, those decisions matter because they determine who buys what, how early long-lead equipment is ordered, whether PCL converts from ECI into the final delivery model and when downstream subcontracting can realistically accelerate.

What is confirmed — and what should not be overstated?

Confirmed / announced
  • Bulli Creek Clean Energy Park has planned / approved capacity of up to 2.5GW on the current project page.
  • BC1 is proposed as 300MW solar plus 425MW / 1,700MWh BESS.
  • The BESS is approximately four hours in duration based on the announced power and energy ratings.
  • The project is approximately 45km south-west of Millmerran.
  • Genex says land tenure arrangements and existing local and Commonwealth approvals are in place.
  • PCL Construction has entered a new Early Contractor Involvement agreement for BC1.
  • PCL had previously been positioned as EPC contractor for the older 775MW solar configuration.
  • Genex and PCL will work on design, delivery methodology, construction planning and commercial readiness.
  • The revised configuration required the grid process to restart.
  • Genex is targeting FID and construction commencement in CY2028.
  • Genex says BC1 will prioritise local content during construction and operations.
Still to watch
  • Grid-connection progress for the revised hybrid configuration.
  • FID timing and final financing / commercial structure.
  • Whether PCL converts from ECI into the final EPC or another principal delivery role.
  • Final BESS technology and system-integrator selection.
  • Transformer, inverter, PCS and HV equipment strategy.
  • Fire-safety and battery-block design.
  • Construction package breakdown and subcontracting sequence.
  • Long-lead procurement timing.
  • Updated offtake / revenue arrangements for the redesigned hybrid project.
  • Local procurement and regional workforce strategy.
  • Final design and sequencing of Stages 2–4 across the wider precinct.
BBI Project Watch Assessment

The ECI is the milestone. The storage-led redesign is the real story.

Bulli Creek 1 is one of those projects where the number attached to the battery tells you more than the solar capacity. A 1,700MWh storage block is large enough to materially alter the project’s electrical architecture, equipment strategy, commissioning complexity and grid value.

The move from 775MW standalone solar to 300MW solar + 425MW / 1,700MWh BESS therefore changes far more than the headline capacity. It changes how energy is dispatched, which long-lead assets matter, which specialist contractors are needed and what has to be proven before the project is bankable.

PCL’s return under ECI is commercially important because it provides construction input during that redesign phase. But BBI would still separate ECI participation from a final construction award. The contractor market should watch for the next progression: design maturity, equipment selections, grid milestones, FID and then confirmed package releases.

For suppliers, the opportunity is not “1,700MWh of batteries” in isolation. It is the full system that has to be built around them.

Industry question If Bulli Creek 1 reaches FID in its current form, which package becomes the hardest to secure: BESS integration, high-voltage equipment, civil delivery, grid commissioning — or skilled regional labour?

The answer says a lot about where the real construction bottleneck may sit in a four-hour solar-and-storage project of this scale.

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Sources

  1. Genex Power — Bulli Creek 1 Project: current 300MW solar + 425MW / 1,700MWh BESS configuration, location, approvals, local content and CY2028 target
  2. Genex Power — Powering Local Progress / Bulli Creek strategy update, 14 May 2026
  3. Genex Power — May 2026 Bulli Creek community presentation: revised hybrid configuration and grid-process restart
  4. Genex Power — announcement of PCL Construction Early Contractor Involvement agreement
  5. Industry Queensland — PCL onboard for Bulli Creek Stage 1 development, 31 August 2026
  6. pv magazine Australia — Bulli Creek Stage 1 ECI and revised project configuration, 2 September 2026
Disclaimer: Bowen Basin Index provides project, procurement, construction and industry information based on publicly available information. Bulli Creek 1 is currently described by Genex Power as a proposed 300MW solar PV project combined with a 425MW / 1,700MWh battery energy storage system within the broader Bulli Creek Clean Energy Park, which the current project page describes as having planned capacity of up to 2.5GW. PCL Construction’s current involvement is an Early Contractor Involvement agreement and should not be interpreted as confirmation of a final EPC award, final contract value, committed construction notice to proceed or complete procurement strategy. Genex is targeting final investment decision and commencement of construction in CY2028; that target remains subject to grid, commercial, financing, design, equipment, market, approval and project-development outcomes. The 1,700MWh figure describes energy storage capacity, while 425MW describes the BESS power rating. The simplified four-hour graphic is an explanatory calculation based on nominal ratings only and is not an operating forecast. Historical references to the earlier 775MW Bulli Creek Stage 1 solar concept are included solely to explain the project’s redesign. Genex’s May 2026 presentation indicated that later stages may follow a similar hybrid configuration, but BBI does not treat Stages 2–4 design as final or confirmed. References to civil, solar, BESS, HV, fire, controls, logistics, testing, commissioning and regional-service scopes are BBI editorial analysis of likely capability areas associated with the announced hybrid configuration and should not be interpreted as confirmation that a specific tender or subcontract is open. The BBI Project Switchboard, Gate Map, Procurement Timing Matrix and Precinct View are editorial tools designed to help readers understand project-development logic and are not official procurement schedules, grid studies, engineering layouts or construction programs. BBI editorial artworks are illustrative only and should not be relied upon as official project photographs, battery layouts, electrical drawings, grid diagrams, construction schedules or tender documents.

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