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131683INTER-REGIONAL TRANSFER16/12/2025 10:48:00 AM
Inter-regional transfer limit variation - Woolooga No. 4 275 kV SVC - QLD region - 16/12/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Woolooga No. 4 275 kV SVC - QLD region - 16/12/2025
At 1032 hrs 16/12/2025 there was an unplanned outage of Woolooga No. 4 275 kV SVC.
The following constraint set(s) invoked at 1040 hrs 16/12/2025
Q-WO_VC
This constraint set(s) contains equations with the following interconnectors on the LHS.
N-Q-MNSP1,NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Woolooga No. 4 275 kV SVC - QLD region - 16/12/2025
At 1032 hrs 16/12/2025 there was an unplanned outage of Woolooga No. 4 275 kV SVC.
The following constraint set(s) invoked at 1040 hrs 16/12/2025
Q-WO_VC
This constraint set(s) contains equations with the following interconnectors on the LHS.
N-Q-MNSP1,NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
131662CONSTRAINTS15/12/2025 02:40:31 PM
Management of Over-Frequency conditions in South Australia
AEMO ELECTRICITY MARKET NOTICE
AEMO has conducted technical assessments to evaluate the adequacy of existing over-frequency generator shedding (OFGS) scheme in South Australia. The OFGS scheme helps to maintain frequency operating standards by tripping generators in a pre-determined manner during over-frequency conditions, to minimise the risk of cascade tripping.
AEMO?s review found that system security risks can arise when high levels of power transfer out of SA coincide with periods when the available OFGS capacity is insufficient to manage potential over-frequency conditions for a non-credible trip of the Heywood interconnector. As such a system normal constraint is required to manage the combined SA export capacity under such conditions, so as to maintain SA power system operations within the limits advised by ElectraNet.
The following constraint equation was implemented at 1425hrs 15 December 2025:
S_V_HEYWOOD_OFGS
Ben Blake
AEMO Operations
AEMO has conducted technical assessments to evaluate the adequacy of existing over-frequency generator shedding (OFGS) scheme in South Australia. The OFGS scheme helps to maintain frequency operating standards by tripping generators in a pre-determined manner during over-frequency conditions, to minimise the risk of cascade tripping.
AEMO?s review found that system security risks can arise when high levels of power transfer out of SA coincide with periods when the available OFGS capacity is insufficient to manage potential over-frequency conditions for a non-credible trip of the Heywood interconnector. As such a system normal constraint is required to manage the combined SA export capacity under such conditions, so as to maintain SA power system operations within the limits advised by ElectraNet.
The following constraint equation was implemented at 1425hrs 15 December 2025:
S_V_HEYWOOD_OFGS
Ben Blake
AEMO Operations
131552INTER-REGIONAL TRANSFER10/12/2025 04:32:23 PM
Inter-regional transfer limit variation - Yass - Marulan 5 330kV line - NSW region - 10/12/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Yass - Marulan 5 330kV line - NSW region - 10/12/2025
At 1616 hrs 10/12/2025 there was an unplanned outage of Yass - Marulan 5 330kV line.
The following constraint set invoked at 1625 hrs 10/12/2025
N-MNYS_5_WG_CLOSE
This constraint set contains equations with the following interconnectors on the LHS.
VIC1-NSW1, V-S-MNSP1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Yass - Marulan 5 330kV line - NSW region - 10/12/2025
At 1616 hrs 10/12/2025 there was an unplanned outage of Yass - Marulan 5 330kV line.
The following constraint set invoked at 1625 hrs 10/12/2025
N-MNYS_5_WG_CLOSE
This constraint set contains equations with the following interconnectors on the LHS.
VIC1-NSW1, V-S-MNSP1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
131548INTER-REGIONAL TRANSFER10/12/2025 02:18:17 PM
Inter-regional transfer limit variation - Tamworth No. 1 330kV SVC - NSW region - 10/12/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Tamworth No. 1 330kV SVC - NSW region - 10/12/2025
At 1356 hrs 10/12/2025 there was an unplanned outage of Tamworth No. 1 330kV SVC.
The following constraint sets invoked at 1410 hrs 10/12/2025
N-TW_SVC
The constraint sets contains equations with the following interconnectors on the LHS.
N-Q-MNSP1,NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Tamworth No. 1 330kV SVC - NSW region - 10/12/2025
At 1356 hrs 10/12/2025 there was an unplanned outage of Tamworth No. 1 330kV SVC.
The following constraint sets invoked at 1410 hrs 10/12/2025
N-TW_SVC
The constraint sets contains equations with the following interconnectors on the LHS.
N-Q-MNSP1,NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
131546INTER-REGIONAL TRANSFER10/12/2025 12:11:14 PM
Inter-regional transfer limit variation - Armidale to Sapphire 8E 330kV Line - NSW region - 10/12/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Armidale to Sapphire 8E 330kV Line- NSW region - 10/12/2025
A planned outage of Armidale to Sapphire 8E 330kV Line in the NSW region was scheduled from 0600 hrs 10/12/2025 to 1500 hrs 10/12/2025.
The outage has been completed and Armidale to Sapphire 8E 330kV Line returned to service at 1210 hrs 10/12/2025
Constraint sets revoked: N-ARSR_8E, N-DM_SVC
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Armidale to Sapphire 8E 330kV Line- NSW region - 10/12/2025
A planned outage of Armidale to Sapphire 8E 330kV Line in the NSW region was scheduled from 0600 hrs 10/12/2025 to 1500 hrs 10/12/2025.
The outage has been completed and Armidale to Sapphire 8E 330kV Line returned to service at 1210 hrs 10/12/2025
Constraint sets revoked: N-ARSR_8E, N-DM_SVC
Manager NEM Real Time Operations
131530INTER-REGIONAL TRANSFER10/12/2025 05:45:43 AM
Inter-regional transfer limit variation - Tamworth SVC 1- NSW region - 10/12/2025
AEMO ELECTRICITY MARKET NOTICE
Tamworth SVC 1- NSW region - 10/12/2025
At 05:17 hrs 10/12/2025 there was an unplanned outage of Tamworth SVC 1.
The following constraint set invoked at 05:25 hrs 10/12/2025
N-TW_SVC
This constraint set contains equations with the following interconnectors on the LHS.
N-Q-MNSP1
NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Tamworth SVC 1- NSW region - 10/12/2025
At 05:17 hrs 10/12/2025 there was an unplanned outage of Tamworth SVC 1.
The following constraint set invoked at 05:25 hrs 10/12/2025
N-TW_SVC
This constraint set contains equations with the following interconnectors on the LHS.
N-Q-MNSP1
NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
131491INTER-REGIONAL TRANSFER07/12/2025 04:43:52 PM
Inter-regional transfer limit variation - Coffs Harbor - Raleigh 9W3 132kV LINE - NSW region - 07/12/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Coffs Harbor - Raleigh 9W3 132kV LINE - NSW region - 07/12/2025
At 1630 hrs 07/12/2025 there was an unplanned outage of Coffs Harbor - Raleigh 9W3 132kV LINE.
The following constraint set(s) invoked at 1640 hrs 07/12/2025
N-CHRL_9W3
This constraint set(s) contains equations with the following interconnectors on the LHS.
NSW1-QLD1,N-Q-MNSP1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Coffs Harbor - Raleigh 9W3 132kV LINE - NSW region - 07/12/2025
At 1630 hrs 07/12/2025 there was an unplanned outage of Coffs Harbor - Raleigh 9W3 132kV LINE.
The following constraint set(s) invoked at 1640 hrs 07/12/2025
N-CHRL_9W3
This constraint set(s) contains equations with the following interconnectors on the LHS.
NSW1-QLD1,N-Q-MNSP1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
131421CONSTRAINTS05/12/2025 06:39:11 PM
New NSW system normal constraint to manage voltage collapse on loss of Lower Tumut to Wagga (051) 330kV line
AEMO ELECTRICITY MARKET NOTICE
Transgrid has advised AEMO of an new voltage stability limit in south-west NSW for loss of Lower Tumut to Wagga (051) 330 kV line. AEMO has now completed the review and testing of this new constraint equation and will implement the following constraint equation in AEMOS Production systems at 0900hrs Monday 8th December 2025.
N::N_NIL_WGLT
This constraint equations includes the generators in southern NSW on the left-hand side as well as Murraylink and VNI.
For full details on the formulation, the new constraint equation has now been loaded into AEMO's pre-production systems.
Ben Blake
AEMO Operations
Transgrid has advised AEMO of an new voltage stability limit in south-west NSW for loss of Lower Tumut to Wagga (051) 330 kV line. AEMO has now completed the review and testing of this new constraint equation and will implement the following constraint equation in AEMOS Production systems at 0900hrs Monday 8th December 2025.
N::N_NIL_WGLT
This constraint equations includes the generators in southern NSW on the left-hand side as well as Murraylink and VNI.
For full details on the formulation, the new constraint equation has now been loaded into AEMO's pre-production systems.
Ben Blake
AEMO Operations
131415INTER-REGIONAL TRANSFER05/12/2025 05:05:39 PM
Inter-regional transfer limit variation - Golden Plains - Cressy 2/GPEC 2 220kV CB - VIC region - 05/12/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Golden Plains - Cressy 2/GPEC 2 220kV CB - VIC region - 05/12/2025
At 1626 hrs 05/12/2025 there was a short notice outage of Golden Plains - Cressy 2/GPEC 2 220kV CB.
The following constraint set(s) invoked at 1635 hrs 05/12/2025
V-CRGP
This constraint set(s) contains equations with the following interconnectors on the LHS.
V-S-MNSP1,VIC1-NSW1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Golden Plains - Cressy 2/GPEC 2 220kV CB - VIC region - 05/12/2025
At 1626 hrs 05/12/2025 there was a short notice outage of Golden Plains - Cressy 2/GPEC 2 220kV CB.
The following constraint set(s) invoked at 1635 hrs 05/12/2025
V-CRGP
This constraint set(s) contains equations with the following interconnectors on the LHS.
V-S-MNSP1,VIC1-NSW1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations