Like clockwork, just prior to 17:00 the AEMO released its preliminary report into some of the things that happened on Tuesday last week, 25th May 2021:
We’ll review this with interest, and incorporate the information contained within it into subsequent articles on WattClarity.
Paul was one of the founders of Global-Roam in February 2000. He is currently the CEO of the company and the principal author of WattClarity. Writing for WattClarity has become a natural extension of his work in understanding the electricity market, enabling him to lead the team in developing better software for clients.
Before co-founding the company, Paul worked as a Mechanical Engineer for the Queensland Electricity Commission in the early 1990s. He also gained international experience in Japan, the United States, Canada, the UK, and Argentina as part of his ES Cornwall Memorial Scholarship.
Still trying to make sense of what did and didn’t happen in QLD last night, Dan Lee provides some context to how yesterday’s record-breaking demand compares to similar historical events.
A quick record of unit trip at CPP3, and associated frequency drop, on Friday 4th April 2025.
1 Commenton "AEMO releases Preliminary Report: Trip of multiple generators and lines in Queensland and associated under-frequency load shedding on 25 May 2021"
Two statements which stand out to me as defining the event.
“At 1334 hrs on 25 May 2021, Callide C4 stopped generating but did not disconnect from the power system.”
“At 1340 hrs, CS informed AEMO of a possible turbine hall fire at Callide C.”
Two statements which stand out to me as defining the event.
“At 1334 hrs on 25 May 2021, Callide C4 stopped generating but did not disconnect from the power system.”
“At 1340 hrs, CS informed AEMO of a possible turbine hall fire at Callide C.”