A ~50-day view of rising spurts of volatility in the LOWER1SEC FCAS market in South Australia

Earlier, we wrote about ‘Network outage on Tailem Bend – Tungkillo 275kV line ended Tue 19th Aug, but Administered Pricing Continues into Wed 20th Aug (part 3)’.

But it’s worth separately (and explicitly) calling out the building pressure we’ve been observing in the LOWER1SEC FCAS (i.e. FFR) market in South Australia across the past ~50 days, illustrated quite well in this trend of Cumulative Price for that commodity in South Australia:

2025-08-20-at-08-15-ez2view-Trend-SA-L1SEC-Price

This trend chart was produced in the ‘Trends Engine’ within ez2view, and we might revisit it next week when the ‘S-TBTU’ constraint set (reflecting the next outage on the Tailem Bend – Tungkillo 275kV line) returns.


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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