Second SIPS testing completed at Waratah Super Battery on Friday afternoon 11th September 2026

Waratah Super Battery completed its second full System Integrity Protection Services (SIPS) test on Friday 11 September 2026, holding 700 MW of discharge for roughly two hours in the early afternoon, then charging at close to its full 850 MW capacity in the late afternoon. This follows a first SIPS test earlier in the week. The unit is now demonstrating both its full discharge and charge capability, suggesting it may be moving toward commercial operation.

Where this fits

Battery storage is not firm power. It is a load-leveler that can hold charge for hours, but it cannot run continuously and it cannot run when the sun is not shining and the wind is not blowing. A grid relying on storage to firm a renewables fleet must oversize the generation capacity (to charge the batteries), oversize the batteries themselves (to bridge multi-day weather events), and still carry gas plant in reserve for the longest calm, dark periods. Waratah's readiness to dispatch 700 MW for two hours is a reliability feature, not a reliability solution. It absorbs afternoon solar gluts and supplies evening demand, but it does not replace firm, dispatchable generation that runs on demand regardless of weather.

What it means

Battery storage is an essential component of a high-renewables grid, and Waratah's successful SIPS tests show the hardware is capable. However, the whole-system cost of a renewables-plus-storage grid, transmission overbuild, generation overbuild, gas firming, battery overbuild, and China supply-chain dependence for the batteries and inverters themselves, remains substantially higher than a grid anchored on firm, energy-dense nuclear plant. Australia's energy security rests on the cost and speed of the path chosen.