From : AEMO
To : NEMITWEB1
Creation Date : 22/10/2025 07:54:07
——————————————————————-
Notice ID : 129902
Notice Type ID : RECLASSIFY CONTINGENCY
Notice Type Description : Reclassify contingency events
Issue Date : 22/10/2025
External Reference : Reclassification of non-credible contingency event due to existence of widespread abnormal conditions – SA region.
——————————————————————-
Reason :
AEMO ELECTRICITY MARKET NOTICE.
AEMO has identified that a non-credible contingency event impacting the power system is more likely to occur and is considered reasonably possible because of the existence of widespread abnormal conditions namely widespread severe weather in the SA region.
AEMO has therefore reclassified the occurrence of a non-credible contingency event involving multiple plant due to these abnormal conditions as credible.
AEMO has taken the following action(s) to maintain power system security at 0800 hrs 22/10/2025. Constraint set(s) invoked: I-VS_250
Duration: 0800 hrs 22/10/2025 until further notice
Need for further measures is being monitored and further measures may be implemented in line with the Power System Security Guidelines (SO_OP_3715).
Manager NEM Real Time Operations
——————————————————————-
END OF REPORT
——————————————————————-’
From : AEMO
To : NEMITWEB1
Creation Date : 22/10/2025 08:01:31
——————————————————————-
Notice ID : 129903
Notice Type ID : RECLASSIFY CONTINGENCY
Notice Type Description : Reclassify contingency events
Issue Date : 22/10/2025
External Reference : Reclassification of non-credible contingency event due to existence of widespread abnormal conditions – Vic region.
——————————————————————-
Reason :
AEMO ELECTRICITY MARKET NOTICE.
AEMO has identified that a non-credible contingency event impacting the power system is more likely to occur and is considered reasonably possible because of the existence of widespread abnormal conditions namely widespread severe weather in the Vic region.
AEMO has therefore reclassified the occurrence of a non-credible contingency event involving multiple plant due to these abnormal conditions as credible.
AEMO has taken the following action(s) to maintain power system security at 0800 hrs 22/10/2025.
Constraint set(s) invoked: I-VS_250
Duration: 0800 hrs 22/10/2025 until further notice
Need for further measures is being monitored and further measures may be implemented in line with the Power System Security Guidelines (SO_OP_3715).
Manager NEM Real Time Operations
——————————————————————-
END OF REPORT
——————————————————————-‘
Notable that AEMO has invoked the same constraint set (i.e. the ‘I-VS_250’ constraint set) to provide backup in both neighbouring regions (i.e. with the assumption seemingly being some contingency is highly unlikely to happen in both regions at the same time).
Those two follow these two earlier ones, with respect to South Australia;
From : AEMO
To : NEMITWEB1
Creation Date : 22/10/2025 07:53:34
——————————————————————-
Notice ID : 129901
Notice Type ID : RECLASSIFY CONTINGENCY
Notice Type Description : Reclassify contingency events
Issue Date : 22/10/2025
External Reference : Reclassification of a Non-Credible Contingency Event: Para-Templers West and Magill-Torrens Island A 275kV lines in SA due to severe weather warning.
——————————————————————-
Reason :
AEMO ELECTRICITY MARKET NOTICE.
Reclassification of a non-credible contingency event as a credible contingency event due to severe weather warning.
AEMO considers the simultaneous trip of the following circuits to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.
Region: SA
Lines: Para-Templers West and Magill-Torrens Island A 275kV lines
Duration: 0745 hrs 22/10/2025 until further notice
Constraint set(s) invoked: Nil
Manager NEM Real Time Operations
——————————————————————-
END OF REPORT
——————————————————————-’
From : AEMO
To : NEMITWEB1
Creation Date : 22/10/2025 07:53:46
——————————————————————-
Notice ID : 129900
Notice Type ID : RECLASSIFY CONTINGENCY
Notice Type Description : Reclassify contingency events
Issue Date : 22/10/2025
External Reference : Reclassification of a Non-Credible Contingency Event: Brinkworth-Davenport, Brinkworth-Templers West and Para-Templers West 275kV lines in SA due to severe weather warning.
——————————————————————-
Reason :
AEMO ELECTRICITY MARKET NOTICE.
Reclassification of a non-credible contingency event as a credible contingency event due to severe weather warning.
AEMO considers the simultaneous trip of the following circuits to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.
Region: SA
Lines: Brinkworth-Davenport, Brinkworth-Templers West and Para-Templers West 275kV lines
Duration: 0745 hrs 22/10/2025 until further notice
Constraint set(s) invoked: Nil
Manager NEM Real Time Operations
——————————————————————-
END OF REPORT
——————————————————————-‘
… so, as WeatherWatch noted ‘hold onto your hats!’.
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.
Day-ahead demand forecasts will be integral to any future ‘Ahead Market’. We take a look at the current state and accuracy trend of demand forecasts made 24 hours ahead as part of the broader piece of work to feed into GenInsights21.
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