CIMIC’s UGL to deliver Stage 3 of Neoen’s Western Downs Battery, following early completion of Stage 2

UGL will prepare the site and install 312 Tesla Megapack 2XL units, along with high-voltage infrastructure, control and switchroom facilities, earthworks and footings. UGL will also provide testing and commissioning support to ensure seamless integration with the grid.

The award builds on UGL’s successful delivery of Stage 1 and the recent early completion of Stage 2 (270 MW / 540 MWh) in November 2025. Together, Stages 1 and 2 provide 540 MW / 1,080 MWh of storage capacity. Once Stage 3 becomes operational – expected in the Australian summer of 2027/28 – the Western Downs Battery will offer a combined total of 845 MW / 2.3 GWh, strengthening grid stability and supporting Australia’s clean energy transition.

ACS Group and HOCHTIEF Chief Executive Officer and CIMIC Group Executive Chairman Juan Santamaría said:

“Stage 3 of the Western Downs Battery will add 305 MW / 1,220 MWh of storage capacity to Queensland’s energy network, building on the success of Stages 1 and 2 delivered by UGL. This expansion strengthens grid reliability and supports the integration of renewable generation in one of Australia’s most important energy corridors. Our team’s role in installing 312 Tesla Megapack units and associated high-voltage infrastructure demonstrates the depth of capability we bring to complex storage projects and our commitment to delivering them safely, efficiently and ahead of schedule.”

UGL Managing Director Doug Moss said:

“UGL is pleased to extend our relationship with Neoen and Tesla, global leaders in renewable energy generation and storage. Western Downs Battery Stage 3 will be our tenth battery installation project and our seventh in partnership with Neoen and Tesla. As a leader in constructing and commissioning renewable energy assets and connecting them to the grid, we are helping to accelerate Australia’s energy transition.”

UGL has delivered 20 major renewable generation and storage projects across Australia, including six flagship big batteries for Neoen: Victorian Big Battery, Western Downs Battery 1 and 2, Collie Battery 1 and 2, and is currently constructing batteries in Muchea, WA.

Construction on Western Downs Battery Stage 3 will commence in February 2026.

CIMIC Group is an engineering-led services, construction and natural resources leader with a history dating back to 1899. Powered by 39,000 people, and pioneering technology and engineering, we deliver high-value and sustainable solutions across the lifecycle of assets, infrastructure and resources projects in around 20 countries. CIMIC Group comprises our engineering and construction businesses CPB Contractors and Leighton Asia, our integrated solutions providers UGL and Sedgman, our natural resources company Thiess (60% ownership), and our development and investment arm Pacific Partnerships – all supported by our in-house engineering consultancy EIC Activities. Our mission is to generate sustainable returns by delivering innovative and competitive solutions for clients and safe, fulfilling careers for our people. We strive to be known for our principles of Integrity, Accountability, Innovation and Delivery, underpinned by Safety.

Ms Fiona Tyndall, Communications, T+61 429 370 414