Frequency drop with unit trip at Eraring Unit 2 on Sunday 26th July 2026

Posted by Paul McArdleSunday 26th July 2026  8:30 AM   Topic: 2026-07-26

I can’t recall when we last saw a trip as large as the 620MW trip that occurred just prior to 08:05 on Sunday morning 26th July 2026:

2026-07-26-at-08-08-ez2view-AppAlerts

 

Here’s the frequency trace – showing a pronounced drop (though does not appear to have been outside the NOFB), followed by a recovery over ~10 minutes:

2017-07-26-at-08-13-NEM-Mainland-Frequency

 

The recovery, in particular, is a reminder that last week we were pleased to be able to host a series of four articles by Dave Scott about the workings of PFR and FPP:

1)  It’s an excellent series, and well worth a read, if you’re operating assets in the NEM

2)  Part 4 was published on Thursday 23rd July as ‘FPP-Reg-FCAS Recovery: to what extent has it succeeded, and could it be improved?’, and that links to the first 3.

It will have been Primary Frequency Response (generally dominated by batteries and coal units) that will have acted in concert to Regulation FCAS to deliver the recovery.

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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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