Eraring BESS OHTL – Stage 2 Transmission Foundations

Enerven / Energy Infrastructure / Deep bored pier foundations for OHTL towers & gantry supports

The Challenge

As part of Origin Energy’s major Battery Energy Storage System (BESS) project at Eraring, IFS & the Milleen Group was engaged to construct the Overhead Transmission Line (OHTL) tower and gantry foundations linking the BESS Switching Station to Transgrid’s infrastructure.

Stage 2 presented new complexities:

Poor ground conditions, unsuited to standard bored piling
Requirement for depths up to 22m
Need for tight integration with project timelines and zero tolerance for delays

“Tight tolerance, challenging ground, no subs — IFS owned it from start to finish.” —Project Supervisor

The IFS Solution

To address geotechnical challenges, IFS implemented a double-wall temporary casing method, allowing us to maintain shaft integrity to full depth and mitigate groundwater ingress and soil instability.

Critically, this entire process was managed completely in-house — with no reliance on external subcontractors. That meant:

Greater control over timeline and quality
Streamlined environmental compliance
Faster mobilisation and delivery

The Outcome

All foundations were delivered to spec, safely and efficiently, within the compressed project schedule. Our in-house delivery model proved its value by reducing coordination risks and improving responsiveness to site conditions.