Snowy 2.0 price tag soars to $25b, 10 times initial estimate - AFR

The cost of Snowy Hydro 2.0, the 26-year-old proposal to pump water between existing reservoirs for energy storage, has blown out to $25 billion. This is roughly ten times the initial estimate from the early 2000s. The project, now under construction, is a pumped-hydro scheme designed to store renewable energy and dispatch it when the sun and wind are not generating. No completion date was given in the reporting.

Where this fits

Snowy 2.0 is the linchpin of Australia's plan to firm a renewables-heavy grid without nuclear power. The tenfold cost overrun is a live case study in how whole-system costs for a renewables-only transition are being chronically underestimated at the outset. Pumped hydro is firm, dispatchable storage, the thing a weather-dependent grid needs, but the capital cost per megawatt-hour of storage is now revealed as far steeper than early modelling suggested. This is not a renewable-technology failure; it is an infrastructure-complexity and project-delivery failure that affects the sums.

What it means

Australia is betting its grid stability on storage infrastructure that costs vastly more than budgeted, with no firm timeline for completion. Every year of delay means a larger share of the grid is renewable and weather-dependent, forcing continued reliance on gas peaking plants to keep the lights on. The alternative, firm, energy-dense nuclear power, with no storage tail and no weather dependency, remains legislatively banned, even as the true cost of the renewable-storage pathway climbs into view.