Future of Queensland’s $18b pumped hydro project hangs in the balance - AFR

Queensland's proposed $18 billion Kidman Springs pumped hydro project, a 12-gigawatt facility designed to store renewable energy, faces an uncertain future. The scheme, which would pump water uphill to a reservoir during periods of high renewable generation and release it downhill through turbines when demand peaks, has stalled amid planning delays, cost pressures, and financing hurdles. No final investment decision has been made, and the project's timeline remains unclear.

Where this fits

Pumped hydro is firm, dispatchable power: it solves the core problem of a renewables-only grid, which is that wind and solar output does not match demand. An $18 billion pumped hydro project is not an alternative to renewables; it is the cost of making renewables work reliably. Its delay exposes the hard trade-off between cheap renewables per megawatt-hour and the full system cost of firming capacity, transmission overbuild, and storage. This is the bill that renewable-only pathways must carry.

What it means

Without large-scale dispatchable storage, Australia cannot retire its coal fleet on schedule while maintaining grid stability. The delay to Kidman Springs means either more gas-fired peaking capacity (with higher marginal emissions per megawatt-hour served), or reliance on interstate transmission to borrow capacity from distant renewables, itself expensive, lengthy to build, and exposed to weather correlation across regions. A low-emissions, firm alternative, nuclear, remains prohibited by law, removing a generation source that would bypass the need for massive storage and transmission overbuild. Queensland is discovering that a renewables grid still needs firming; the question is only whether that firming comes via gas, storage, or a firm low-carbon source the law forbids.