At ~14:15 we posted ‘Drop in System Frequency on the Mainland on Thursday 5th September 2024’ so it’s worth now posting an updated trend to 14:53:
About the Author
Paul McArdle
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.
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Paul McArdle Sun 5th October 2025
Difficult to see any fluctuation in Mainland Frequency on Saturday morning 4th October 2025, with BW02 offline (two-shifting)
I was keen to see if there was any noticeable blip in System Frequency resulting from the BW02 unit coming offline on Saturday 4th October 2025 for the brief (two-shift) outage.
Linton Corbet Wed 3rd September 2025
Instances of system frequency outside the normal operating band
How common is it that mainland frequency deviates outside the NOFB (normal operating frequency band)?
Paul McArdle Tue 13th February 2024
Mainland System Frequency drops through the floor with ‘Significant Power System Event’ on Tue 13th Feb 2024
Second quick article about 13th February 2024 … with mainland power system frequency dropping through the floor in this ‘Significant power system event’ in Victoria.
Linton Corbet Tue 27th May 2025
Drop in mainland system frequency on 26 May 2025
The measurements indicated frequency ducked just below the NOFB briefly, reaching 49.843 Hz.

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