Yes, prices do jump this high in the middle of the night, occasionally:
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.
Related Articles
Paul McArdle Thu 8th September 2022
Overnight volatility in South Australia – part 1
A run of volatility in South Australia lasting ~90 minutes triggered a few alerts.
Paul McArdle Thu 6th November 2025
‘Market Demand’ in South Australia drops by 216MW (or 21%) on Thursday afternoon 6th November 2025
Worth recording this other ez2view ‘Notification’ widget alert received at 14:11 (NEM time) on Thursday 6th November 2025 to mark a large-size drop in ‘Market Demand’ in South Australia.
Paul McArdle Tue 9th June 2015
Even the liquid-fuelled plant get a run in SA this evening with Northern offline, demand higher, and wind waning
Some quick notes Tuesday evening about liquid-fuelled peaking generators getting a run in a South Australian region that’s missing Northern station (amongst other factors)
Paul McArdle Wed 17th February 2021
The accelerating rise of Negative Prices in the NEM
A longer-term trend of the incidence of negative prices across each region of the NEM … and, most interestingly, the pattern by time of day.

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