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[EventId:202507251830_NRM_VIC1_NSW1_stopped] NEGRES CONSTRAINT NRM_VIC1_NSW1 ceased operating from 25 July 2025 18:30
Issued by Australian Energy Market Operator Ltd at 1830 hrs on 25 July 2025
CANCELLATION - ACTUAL NEGATIVE SETTLEMENT RESIDUES - VIC to NSW - 25 July 2025.
Refer to market notice: 128338
AEMO has ceased taking action to minimize the further accumulation of negative settlement residues on the VIC to NSW directional interconnector.
The negative residue constraint NRM_VIC1_NSW1 ceased operating at 1830 hrs on 25 July 2025.
This is an AEMO autogenerated Market Notice.
Cancellation of the reclassification of a Non-Credible Contingency Event: Para-Templers West and Magill-Torrens Island A 275kV lines in SA due to severe weather warning.
Cancellation of the 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 is no longer reasonably possible. There is no longer any severe weather warning in the vicinity of the following lines. Accordingly its classification has reverted to a non-credible contingency event.
Region: SA
Lines: Para-Templers West and Magill-Torrens Island A 275kV lines
Cancellation time: 1800 hrs 25/07/2025
Constraint set(s) revoked: Nil
Refer AEMO Electricity Market Notice 128304
Manager NEM Real Time Operations
[EventId:202507251735_NRM_VIC1_NSW1_started] NEGRES CONSTRAINT NRM_VIC1_NSW1 started operating from 25 July 2025 17:35
Issued by Australian Energy Market Operator Ltd at 1735 hrs on 25 July 2025
ACTUAL NEGATIVE SETTLEMENT RESIDUES - VIC to NSW - 25 July 2025.
Electricity Market outcomes have resulted in the accumulation of negative settlement residues that have exceeded the allowable negative residue threshold for the VIC to NSW directional interconnector.
The negative residue constraint set NRM_VIC1_NSW1 commenced operating from 1735 hrs on 25 July 2025.
This constraint set contains an equation with the following interconnectors on the LHS:
VIC1-NSW1
The RHS of the constraint equation may be adjusted to manage residues.
This is an AEMO autogenerated Market Notice.
[EventId:202507251735_NRM_VIC1_SA1_started] NEGRES CONSTRAINT NRM_VIC1_SA1 started operating from 25 July 2025 17:35
Issued by Australian Energy Market Operator Ltd at 1735 hrs on 25 July 2025
ACTUAL NEGATIVE SETTLEMENT RESIDUES - VIC to SA - 25 July 2025.
Electricity Market outcomes have resulted in the accumulation of negative settlement residues that have exceeded the allowable negative residue threshold for the VIC to SA directional interconnector.
The negative residue constraint set NRM_VIC1_SA1 commenced operating from 1735 hrs on 25 July 2025.
This constraint set contains an equation with the following interconnectors on the LHS:
V-S-MNSP1
V-SA
The RHS of the constraint equation may be adjusted to manage residues.
This is an AEMO autogenerated Market Notice.
STPASA - Cancellation of the Forecast Lack Of Reserve Level 2 (LOR2) in the SA Region on 28/07/2025
The Forecast LOR2 condition in the SA region advised in AEMO Electricity Market Notice No. 128313 is cancelled at 1400 hrs 25/07/2025.
No LOR condition is currently forecast in the STPASA period.
AEMO Operations
Cancellation: Reclassification of non-credible contingency event due to existence of widespread abnormal condition/s - SA region.
AEMO considers the occurrence of a non-credible contingency event due to the widespread abnormal conditions advised in AEMO Electricity Market Notice 128312 is no longer reasonably possible and accordingly its classification has reverted to non-credible.
Cancellation time: 1330 hrs 25/07/2025
Constraint set(s) revoked: I-VS_250
Manager NEM Real Time Operations
STPASA - Forecast Lack Of Reserve Level 2 (LOR2) in the SA Region on 28/07/2025
AEMO declares a Forecast LOR2 condition under clause 4.8.4(b) of the National Electricity Rules for the SA region for the following period:
From 0730 hrs to 0900 hrs 28/07/2025.
The forecast capacity reserve requirement is 563 MW.
The minimum capacity reserve available is 536 MW.
AEMO is seeking a market response.
AEMO has not yet estimated the latest time it would need to intervene through an AEMO intervention event.
AEMO Operations
Reclassification of non-credible contingency event due to existence of widespread abnormal condition/s - SA region.
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 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 0850 hrs 25/07/2025.
Constraint set(s) invoked:
I-VS_250
Duration: 0850 hrs 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
Reclassification of a Non-Credible Contingency Event: Para-Templers West and Magill-Torrens Island A 275kV lines in SA due to severe weather warning.
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: 0115 hrs 25/07/2025 until further notice
Constraint set(s) invoked: Nil
Manager NEM Real Time Operations