As something we might refer back to later, here’s a 4-hour trend of NEM Mainland Grid Frequency on Sunday 12th October 2025 – from 09:00 to 13:00 (NEM time):
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.
Various authors have shared articles about frequency, frequency control and Regulation FCAS in recent times (including 6 from Linton). Here’s three things that jumped out to me in these pieces of analysis.
Not seeing any obvious blip in system frequency (at the time BW02 came offline on Sat 4th Oct 2025) we also looked at the similar outage on Sun 5th Oct 2025.
To further understand the frequency drop we delve into the 4-second data (used for regulation FCAS contribution calculations) in this Part 2, looking at generating units (including BDUs).
Second quick article about 13th February 2024 … with mainland power system frequency dropping through the floor in this ‘Significant power system event’ in Victoria.
1 Commenton "Four hours of Mainland Grid Frequency, on Sunday 12th October 2025"
Clouds.