Source-based case25 MAY 2021
Callide C4 and Queensland under-frequency load shedding
Loss of auxiliary supplies at Callide C4 preceded a major Queensland disturbance involving multiple generator and line trips and under-frequency load shedding.
Permanent case linkYour task
Distinguish equipment failure, plant response and wider-system consequence; prioritise assurance actions without hindsight bias.
PrepareIncident timeline + barrier analysis + 90-day assurance plan
Your role
Generation operations and asset-assurance adviser
Related topics 7
Sources & evidence
AEMO incident report, unit sequence, frequency trace, protection response, auxiliary systems and restoration actions
AEMO power-system incident reportsReview your response
- Distinguish sourced facts from assumptions and synthetic inputs.
- Show how the physical system and commercial decision connect.
- Check the calculation and test an alternative explanation.
- State an action, its owner and what would change your recommendation.
This checklist supports self-review. No tutor marking or independent credential is included.