Western Australia targets 75% renewables share for main grid

Western Australia has set a target of 75% renewables on its main grid by 2030-2031, coinciding with the planned retirement of its coal-fired power stations. The state has not announced a replacement dispatchable power source to manage the variability of wind and solar output or to firm the grid during low-generation periods.

Where this fits

This target bears directly on the reliability and firming cost question. A 75% renewables share requires the remaining 25% of generation to do two jobs at once: supply firm baseload power and provide the ramping and reserve capacity that weather-dependent sources cannot. Western Australia will need either a substantial gas fleet running at low capacity factors, or battery storage built to unprecedented scales. Neither has been costed in detail. The sovereign alternative, nuclear power, which has the lowest lifecycle emissions of any generation source and requires no Chinese supply chain, remains banned by law. This target is being set without naming what will fill the firm-power gap, which is how whole-system costs stay hidden.

What it means

The retirement of coal plants by end-decade leaves the state with one decade to build, permit and commission either massive new gas infrastructure or battery capacity that does not yet exist at scale. This is a national security question: any grid that cannot meet demand in real time becomes vulnerable to disruption, and any supply chain dependent on manufactured goods from geopolitically contested sources narrows Australia's options during a strategic crisis. The honest cost of this path includes not only the renewables hardware, but the firming plant, transmission overbuild, and China-sourced battery and inverter dependence that the 75% figure does not express.