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126466GENERAL NOTICE10/04/2025 11:12:18 AM
Release of PEC-1 and combined V-SA limits - 11 April 2025
AEMO ELECTRICITY MARKET NOTICE
Refer to market notice 123956
AEMO, Transgrid and Electranet have reviewed the test results following the PEC Stage 1 testing on 31st January 2025. Hold points 4 and 5 can now be released.
The following limits will be released as of 1000hrs 11th April 2025:
- PEC-1 - 150 MW (both directions)
- Heywood + PEC1 - 750 MW from Vic to SA and 700 MW from SA to Vic
- The existing Heywood limits of 600 and 550 MW are not being changed.
With the release of these limits AEMO will be looking for testing opportunities for increases to Heywood as per the test plan: https://aemo.com.au/-/media/files/stakeholder_consultation/consultations/nem-consultations/2023/project-energyconnect-stage-1-and-hic-capacity-release/pec-stage-1-and-hic---final-test-program.pdf?la=en.
Ben Blake
AEMO Operations
Refer to market notice 123956
AEMO, Transgrid and Electranet have reviewed the test results following the PEC Stage 1 testing on 31st January 2025. Hold points 4 and 5 can now be released.
The following limits will be released as of 1000hrs 11th April 2025:
- PEC-1 - 150 MW (both directions)
- Heywood + PEC1 - 750 MW from Vic to SA and 700 MW from SA to Vic
- The existing Heywood limits of 600 and 550 MW are not being changed.
With the release of these limits AEMO will be looking for testing opportunities for increases to Heywood as per the test plan: https://aemo.com.au/-/media/files/stakeholder_consultation/consultations/nem-consultations/2023/project-energyconnect-stage-1-and-hic-capacity-release/pec-stage-1-and-hic---final-test-program.pdf?la=en.
Ben Blake
AEMO Operations
126465INTER-REGIONAL TRANSFER10/04/2025 10:00:31 AM
Update - Inter-regional transfer limit variation - APD - Heywood - Mortlake 500 kV line - VIC region - 10/04/2025
AEMO ELECTRICITY MARKET NOTICE
Update - Inter-regional transfer limit variation - APD - Heywood - Mortlake 500 kV line - VIC region - 10/04/2025
Refer to Market Notice 126464.
The cause of the unplanned outage of APD - Heywood - Mortlake 500 kV line in the VIC region has been identified and resolved. The outage has been completed and the APD - Heywood - Mortlake 500 kV line returned to service at 0948 hrs 10/04/2025
Constraint set(s) revoked: V-HYMO
Manager NEM Real Time Operations
Update - Inter-regional transfer limit variation - APD - Heywood - Mortlake 500 kV line - VIC region - 10/04/2025
Refer to Market Notice 126464.
The cause of the unplanned outage of APD - Heywood - Mortlake 500 kV line in the VIC region has been identified and resolved. The outage has been completed and the APD - Heywood - Mortlake 500 kV line returned to service at 0948 hrs 10/04/2025
Constraint set(s) revoked: V-HYMO
Manager NEM Real Time Operations
126464INTER-REGIONAL TRANSFER10/04/2025 08:49:30 AM
Inter-regional transfer limit variation - APD - Heywood - Mortlake 500 kV line - VIC region - 10/04/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - APD - Heywood - Mortlake 500 kV line - VIC region - 10/04/2025
At 0825 hrs 10/04/2025 there was an unplanned outage of the APD - Heywood - Mortlake 500 kV line.
The following constraint set(s) invoked at 0835 hrs 10/04/2025
V-HYMO
This constraint set(s) contains equations with the following interconnectors on the LHS.
V-SA,T-V-MNSP1,V-S-MNSP1,VIC1-NSW1,NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - APD - Heywood - Mortlake 500 kV line - VIC region - 10/04/2025
At 0825 hrs 10/04/2025 there was an unplanned outage of the APD - Heywood - Mortlake 500 kV line.
The following constraint set(s) invoked at 0835 hrs 10/04/2025
V-HYMO
This constraint set(s) contains equations with the following interconnectors on the LHS.
V-SA,T-V-MNSP1,V-S-MNSP1,VIC1-NSW1,NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
126263GENERAL NOTICE04/04/2025 08:11:29 AM
Update - Vulnerable lines in Qld region
AEMO ELECTRICITY MARKET NOTICE.
Update - Lightning vulnerable lines in Qld region
Refer to AEMO Electricity Market Notice 126262 and 126271
At 0152 hrs 04/04/2025 the the Ross - Townsville South No 7156 and 7249 132kV lines tripped.
The cause of the trip was identified as due to lightning.
In accordance with SO_OP_3715, AEMO now considers the the Ross - Townsville South No 7156 and 7249 132kV lines to be vulnerable with a category of probable due to lightning.
Manager NEM Real Time Operations
Update - Lightning vulnerable lines in Qld region
Refer to AEMO Electricity Market Notice 126262 and 126271
At 0152 hrs 04/04/2025 the the Ross - Townsville South No 7156 and 7249 132kV lines tripped.
The cause of the trip was identified as due to lightning.
In accordance with SO_OP_3715, AEMO now considers the the Ross - Townsville South No 7156 and 7249 132kV lines to be vulnerable with a category of probable due to lightning.
Manager NEM Real Time Operations
126058INTER-REGIONAL TRANSFER30/03/2025 02:14:22 PM
Inter-regional transfer limit variation - constraint automation to manage Power System Security in NSW region - 30/03/2025
AEMO ELECTRICITY MARKET NOTICE
In order to maintain the power system in a secure operating state in the NSW region, AEMO has invoked automated constraint set CA_SYDS_56FB4FDD from 1405 hrs until further notice.
This constraint set contains equations with the following interconnector on the LHS;
VIC1-NSW1
Refer to AEMO Network Outage Scheduler (NOS) for further information.
Manager NEM Real Time Operations
In order to maintain the power system in a secure operating state in the NSW region, AEMO has invoked automated constraint set CA_SYDS_56FB4FDD from 1405 hrs until further notice.
This constraint set contains equations with the following interconnector on the LHS;
VIC1-NSW1
Refer to AEMO Network Outage Scheduler (NOS) for further information.
Manager NEM Real Time Operations
126031INTER-REGIONAL TRANSFER29/03/2025 04:45:41 AM
Inter-regional transfer limit variation - Mullumbimby - Dunoon - Lismore 132 kV 9U6 line - NSW region - 29/03/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Mullumbimby - Dunoon - Lismore 132 kV 9U6 line - NSW region - 29/03/2025
At 0427 hrs 29/03/2025 there was an unplanned outage of Mullumbimby - Dunoon - Lismore 132 kV 9U6 line.
The following constraint set(s) invoked at 0435 hrs 29/03/2025
N-LSDU_9U6
This constraint set(s) contains equations with the following interconnectors on the LHS.
N-Q-MNSP1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Mullumbimby - Dunoon - Lismore 132 kV 9U6 line - NSW region - 29/03/2025
At 0427 hrs 29/03/2025 there was an unplanned outage of Mullumbimby - Dunoon - Lismore 132 kV 9U6 line.
The following constraint set(s) invoked at 0435 hrs 29/03/2025
N-LSDU_9U6
This constraint set(s) contains equations with the following interconnectors on the LHS.
N-Q-MNSP1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
125993INTER-REGIONAL TRANSFER27/03/2025 11:57:49 AM
Inter-regional transfer limit variation - Hazelwood -South Morang No.1 500 kV line - VIC region - 27/03/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Hazelwood -South Morang No.1 500 kV line - VIC region - 27/03/2025
At 1150 hrs 27/03/2025 there was a short notice outage of Hazelwood -South Morang No.1 500 kV line.
The following constraint set(s) invoked at 1150 hrs 27/03/2025
V-HWSM
This constraint set(s) contains equations with the following interconnectors on the LHS.
T-V-MNSP1,V-S-MNSP1,V-SA,VIC1-NSW1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Hazelwood -South Morang No.1 500 kV line - VIC region - 27/03/2025
At 1150 hrs 27/03/2025 there was a short notice outage of Hazelwood -South Morang No.1 500 kV line.
The following constraint set(s) invoked at 1150 hrs 27/03/2025
V-HWSM
This constraint set(s) contains equations with the following interconnectors on the LHS.
T-V-MNSP1,V-S-MNSP1,V-SA,VIC1-NSW1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
125990INTER-REGIONAL TRANSFER27/03/2025 08:27:19 AM
Inter-regional transfer limit variation - constraint automation to manage Power System Security in NSW region - 27/03/2025
AEMO ELECTRICITY MARKET NOTICE
In order to maintain the power system in a secure operating state in the NSW region, AEMO has invoked automated constraint set CA_SYDS_56F70932 from 0820 hrs until further notice.
This constraint set contains equations with the following interconnector on the LHS;
VIC1-NSW1
Manager NEM Real Time Operations
In order to maintain the power system in a secure operating state in the NSW region, AEMO has invoked automated constraint set CA_SYDS_56F70932 from 0820 hrs until further notice.
This constraint set contains equations with the following interconnector on the LHS;
VIC1-NSW1
Manager NEM Real Time Operations
125964INTER-REGIONAL TRANSFER26/03/2025 04:39:26 PM
Inter-regional transfer limit variation - Palmerston A 220kV Bus - TAS region - 26/03/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Palmerston A 220kV Bus - TAS region - 26/03/2025
Refer to Market Notice 125962.
The following constraint set(s) invoked from 1600 hrs to 1620 hrs 26/03/2026.
T-LIPM_WACB
T-LIPM_WACB_SL_N-2
This constraint set(s) contains equations with the following interconnectors on the LHS.
T-V-MNSP1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Palmerston A 220kV Bus - TAS region - 26/03/2025
Refer to Market Notice 125962.
The following constraint set(s) invoked from 1600 hrs to 1620 hrs 26/03/2026.
T-LIPM_WACB
T-LIPM_WACB_SL_N-2
This constraint set(s) contains equations with the following interconnectors on the LHS.
T-V-MNSP1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations