I was keen to see if there was any noticeable blip in System Frequency resulting from the unit coming offline on Saturday 4th October 2025, so quickly extracted a 3-hour run of data from one of our higher speed (i.e. at 0.1 second cadence) monitors in Brisbane:
It’s difficult to see any downwards blip at all, in the 5-minutes prior to 08:06 yesterday morning … and that’s a good thing!
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.
As time has permitted, I’ve invested some time to prepare this first stage of a review of what went on during the period from 31st Jan 2020 to 17th Feb 2020 – a period during which the South Australian region formed its own frequency island following the transmission line damage. A period we’ve called an ‘accelerated accidental experiment’.
The East Coast power system of Australia has the worst frequency regulation in the developed world. This puts the system at risk whenever an event occurs which requires the generators to respond quickly – they can’t respond quickly if they have to wait for the system frequency to go outside its control system dead band.
The multi-region islanding event on Saturday 25th August was a very rare event – perhaps the only one’s that occurred in the history of the NEM. It has generated plenty of questions – and driven our analysis further. We share some more observations here, and keenly await the draft AEMO report.
At 10:42 (NEM time) this morning the AEMO published MN124235 pertaining to tomorrow (Friday 7th February 2024) for forecast LOR2 in NSW. So we take a quick look…
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