Weakness in frequency stability on Thursday afternoon 16th October 2025

Posted by Paul McArdleFriday 17th October 2025  8:20 AM   Topic: 2025-10-16

There’s already been a handful of articles relating to Thursday 16th October 2025.  Particularly relevant here:

 

But it turns out that the trips of YWPS3 and YWPS4 were not the primary drivers of the worst periods of frequency performance across the day.

 

Instead, as the following 8-hour trend puts in context with the larger frequency disruptions, they looks more like the typical pattern caused by challenges in forecasting/dispatching VRE later in the day:

2025-10-16-GridFrequency-8hours

 

As time permits, we’ll look in more detail …

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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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3 Trackbacks & Pingbacks

  1. Peeling the second layer of the onion, with respect to the (SemiSched-induced) frequency weakness on Thursday 16th October 2025 - WattClarity
  2. Taking a first focused look at the 16:50 dispatch interval on Thursday 16th October 2025 (with frequency dropped below NOFB) ... Part 3 - WattClarity
  3. Selected 4-second data relating to the (SemiSched-induced) frequency weakness on Thursday 16th October 2025 (i.e. Part 4) - WattClarity

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