But it turns out that there was a major drop in System Frequency (looks to be well south of the NOFB at first glance) that clarifies that something physical also happened:
We don’t know what happened, yet (and strangely there are no Market Notices, either), so we might wait for ‘next day public’ data to know more – just wanted to flag this here this evening so readers don’t think it was ‘just’ a data glitch.
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.
Adding to the list of articles we’ve collated about the frequency disturbance on Tuesday 19th August 2025, we’re copying in what AEMO published in its 2025 Q3 monitoring report about the glitch.
Next layer of the onion, in investigating the eerily similar (and closely related) frequency spikes outside the NOFB on Friday 10th April 2026 and Saturday 11th April 2026.
We noticed yesterday (Saturday 20th September 2025) a large afternoon dip in frequency down towards (but not outside) the limits of the NOFB – and briefly explore here.
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