With this extracted trend of mainland NEM system frequency (measured at 0.1 second cadence) it appears that there was some large(ish) trip in demand somewhere on the Queensland network, given the spike in frequency at ~07:28 on Tuesday 14th October 2025:
Given that this is a 4-hour trend of frequency that includes some ~75 minutes prior to sunrise in Brisbane, it’s useful to highlight the difference in the ‘pre-sunrise’ pattern in frequency. We are increasingly seeing a marked difference.
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.
At 23:05 on Saturday 9th March AEMO advised that the Millmerran power station units 1 and 2 tripped simultaneously at 22:07 (58 minutes prior) – for reasons still unknown.
A first look at a frequency spike (outside the NOFB) focused in the 10:30 (excursion) and 10:35 (recovery) dispatch intervals NEM time on Friday 10th April 2026.
A first after-the-fact review of the price volatility seen in QLD and NSW on Tuesday evening, 2nd May 2022. What were some of the causal factors?
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