Every transmission tower begins with a foundation designed to perform for decades. While the towers will become the visible landmarks of the HumeLink West Transmission Line Project, it’s the engineering beneath the surface that will quietly support Australia’s electricity network for generations.Working alongside UGL, Australian Piling Group (APG) is delivering the specialist piling works that underpin one of Australia’s largest energy infrastructure projects. Stretching hundreds of kilometres across regional New South Wales, HumeLink West presents a different challenge at almost every tower location. Ground conditions change, access varies and every foundation has its own design requirements, meaning the approach used on one tower may not be suitable for the next.That’s why planning starts well before drilling begins.
As Lead Estimator Ajay Mohan explains:
“The ground always has the final say. You can investigate as much as you like, but the real conditions only reveal themselves once drilling begins.”
Rather than reacting to changing conditions, the team prepares for them. Multiple drilling strategies are developed before work begins, ensuring the right piling rigs, tooling, casings and personnel are available as conditions evolve. Where hard rock has been encountered, pilot drilling, specialised roller-bit tooling and larger-capacity piling rigs have enabled construction to continue while maintaining programme.
Across the project, APG is constructing 1050mm to 2400mm diameter bored piles, using both vertical and raked pile configurations to suit the loading requirements of each transmission tower. Permanent and temporary steel casings are used across varying ground conditions, while purpose-built formwork systems and rigorous survey control ensure every pile head and transmission tower stub is positioned accurately before concrete placement.
As Project Engineer Chrish explains:”Every day starts with planning for multiple scenarios. If you’re reacting to changing ground conditions, you’re already behind.”
As the project has evolved, so has APG’s involvement. What began with two piling rigs operating from Wagga Wagga has grown to seven rigs working simultaneously across multiple work fronts. Supported by specialised rock-drilling equipment, cranes, concrete pumps and experienced crews, the team has continued to adapt while maintaining quality, productivity and programme.
Reflecting on the project’s growth, Project Manager Mirwiss Amiri says:
“As the project evolved, the client asked whether we could increase our resources to help maintain programme. We had the capability to scale up quickly, so that’s exactly what we did.”
Projects like HumeLink West show that successful foundation construction is about more than installing piles. It comes from understanding the ground, planning for change and having the experience to adapt as the project evolves.
Because while the transmission towers will become the visible symbol of HumeLink West, it’s the engineering below ground that will quietly underpin Australia’s energy future.
