Australia’s largest energy companies have criticized Transgrid’s attempt to recover an additional $1.2 billion in costs following a significant budget overrun on Project EnergyConnect, a major high-voltage transmission line linking New South Wales, Victoria, and South Australia.
The Australian Energy Regulator (AER) moved in September to reject Transgrid’s application to pass these extra costs onto consumers, citing concerns over the expenditure’s justification. The proposed cost increase would have raised the annual power bill for a typical household by approximately $18.
Project EnergyConnect, a 900-kilometer transmission line, was initially approved with a capital budget of $2.1 billion. However, Transgrid sought to recover an extra $1.2 billion above that amount after a series of disruptions and financial challenges affected the project’s construction.
The project’s difficulties largely stemmed from the collapse of Clough, a West Australian contractor responsible for building the link. Clough entered voluntary administration in 2022 amid broader financial strain on large infrastructure companies, following several cost overruns and project setbacks. Italian construction group Webuild acquired Clough in 2023 but excluded EnergyConnect from the takeover deal.
Transgrid attributed the cost blowout to multiple factors, including Clough’s collapse, COVID-19-related supply chain delays, labour shortages, inflation, flooding, and geopolitical disruptions. The transmission company argued these circumstances justified the additional capital expenditure, which it sought to recover from consumers.
However, AGL Energy sharply rejected Transgrid’s position, accusing the transmission operator of inadequate oversight over its contractor. In a submission to the AER, AGL stated that Transgrid’s increased costs were not caused by unforeseen contractual failures beyond its control, but rather by the company’s failure to manage the contractor effectively or act prudently in enforcing contractual obligations.
AGL highlighted that prior to the collapse, warning signs were evident: flooding incidents, Clough’s voluntary administration, productivity declines, escalation claims, and material losses were all observable. The company contended that a reasonable transmission operator should have anticipated the risk of contractor distress given these circumstances and taken steps to mitigate exposure under the fixed-price contract.
The dispute comes amid heightened scrutiny of Australia’s energy infrastructure projects. For example, the Snowy Hydro 2.0 electricity storage project recently doubled its cost estimate to $25 billion, stirring further debate over the management of major energy investments.
The AER had earlier outlined that Transgrid failed to meet at least two of seven mandatory criteria required for cost recovery under the National Electricity Rules. The regulator’s final decision on the application is pending, but its preliminary stance signals skepticism toward the transmission company’s justification for passing the cost overruns onto consumers.
As energy infrastructure costs rise, the disagreement highlights ongoing tensions between network operators and energy retailers over who should bear financial risks from project execution challenges and cost escalations.