Fourth article today in this growing category about what happened with the coincident trip of ER01 and ER02 today was this second snapshot taken from our internal monitoring of mainland frequency in the NEM:
This second snapshot (which follows the first here) shows that:
1) Per MN115944 the trips occurred at ~13:22 (NEM time) on Wednesday 3rd April 2024; and
2) With a 7-8 minute recovery time, this means frequency back up to ~50Hz by ~13:30 (NEM time), roughly speaking.
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.
Investing some time over the weekend with a some higher-speed data on output of rooftop solar PV systems across VIC and SA reveals some interesting observations about what happened on Friday 31st January 2020 in conjunction with the transmission damage and Heywood trip.
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.
Following a reminder in a phone call today, I’ve updated the date range in a NEMreview trend previously used in February to look at percentage of Underlying Demand in NSW supplied for each half hour over the 5 day period Monday 6th May 2024 to Friday 10th May 2024 (which includes 3 volatile periods leading to Administered Pricing).
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