After a little over a week away, I’m striving to skim and scan many different data sources with respect to the ‘what did I miss?’ question – and the following late afternoon weakness in system frequency (on Sunday 30th November 2025) jumped out at me:
At some point in future we might be able to look into:
The extent to which under-performance of VRE was a factor:
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.
Having already noted the ‘Weakness in frequency stability on Thursday afternoon 16th October 2025’, we take a look at the causes – for the four high-profile dispatch intervals.
Extracted our high(er) speed readings highlights that the mainland frequency exceeded the NOFB for a period of the morning on Tuesday 11th November 2025.
Earlier today we trended the incidence of large Aggregate Raw Off-Target across all Semi-Scheduled units. In this updated tabulated list, we list each of the largest instances from January 2024 to June 2025.
A short note with this snapshot of a 6-hour long frequency trace on Friday afternoon 31st October 2025, to capture what looks like another VRE-induced frequency wobble earlier this afternoon.
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