Grid-forming BESS has demonstrated the ability to support voltage waveform stability, one component of system strength that has historically required synchronous machines. What it has not yet been confirmed to deliver at scale is protection-quality fault current, the higher standard required to meet minimum system strength levels under the National Electricity Rules. The scale of the system strength challengeThe GPSRR’s analysis of the system strength risk is detailed and scenario-specific. The findings for New South Wales are relatively encouraging, provided synchronous condensers and transmission augmentations are delivered on schedule. The GPSRR frames those incidents as evidence that low-probability events of this type are not hypothetical, thereby directly informing the urgency of system strength delivery timelines.