Snowy Hydro has confirmed another significant cost overrun for the Snowy 2.0 pumped hydro project, pushing the estimated total expenditure to $13.8 billion. The figure represents an escalation from the $11.6 billion forecast in late 2022 and a stark contrast to the initial estimate of $2 billion when the project was announced in 2018. The national energy company attributed the latest increase to prolonged underground works, including tunnelling, and ongoing supply chain pressures impacting crucial equipment.
The expanded budget has drawn sharp criticism from industry analysts and opposition parties, who argue the project’s spiralling costs raise questions about its economic viability and the government’s oversight. The increase means the project now sits at least seven times over its original budget, a scale of overrun rarely seen in Australian infrastructure projects of this nature. Snowy Hydro chief executive Dennis Smith acknowledged the challenges, stating, 'We remain committed to delivering this critical piece of energy infrastructure. The complexities of tunnelling more than 200 metres underground are substantial, and we are navigating them as efficiently as possible while ensuring safety remains paramount.'
Delays in Tunnelling and Equipment Procurement
A key driver behind the latest cost blowouts has been the extended timeframe for excavation and tunnelling works, particularly the construction of the 27-kilometre-long main access tunnel linking Tantangara and Talbingo dams. Technical challenges encountered during the excavation process have led to slower progress than initially projected. Furthermore, global supply chain disruptions have continued to impact the procurement of specialised plant and equipment, including turbine generators, contributing to both delays and increased material costs.
Workers monitoring excavation progress within the Snowy 2.0 tunnelling site. Credit: Snowy Hydro
Dr. Eleanor Vance, an energy infrastructure analyst at the Sydney Institute for Economic Research, expressed concern over the repeated cost escalations. 'This project was always ambitious, but the scale of these overruns is deeply concerning. It diverts significant public funds and raises doubts about the ability of government-owned corporations to manage mega-projects effectively in the current economic climate. We need greater transparency on the specific cost drivers and more rigorous independent oversight moving forward.'
Acknowledging Project Complexities
Snowy Hydro has emphasised the project's strategic importance in providing reliable, dispatchable renewable energy to the National Electricity Market, particularly its role in firming up intermittent solar and wind generation. The company stated that extensive geological surveys and expert assessments were integral to the project's design, but the reality of underground works often presents unforeseen conditions. Federal Minister for Climate Change and Energy, Mark Butler, reiterated the government's support for Snowy 2.0, stating that 'while these cost increases are regrettable, the project remains vital for our transition to net-zero emissions and ensuring energy security for all Australians.'
However, the escalating costs continue to fuel debate. Local residents in areas near the construction sites, such as Talbingo, have expressed mixed feelings. 'We see the work happening, and we understand it’s a big project,' said local farmer, Bruce Mitchell. 'But the constant talk of more money being needed makes you wonder if it’ll ever be finished, and what the final price will really be. We just hope it brings the benefits they keep talking about.' Snowy Hydro maintains it is implementing stringent cost-control measures and is working closely with contractors to mitigate further delays and expense.