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131794RESERVE NOTICE18/12/2025 05:58:18 PM
Actual Lack Of Reserve Level 2 (LOR2) in the NSW region - 18/12/2025
AEMO ELECTRICITY MARKET NOTICE
Actual Lack Of Reserve Level 2 (LOR2) in the NSW region - 18/12/2025
An Actual LOR2 condition has been declared under clause 4.8.4(b) of the National Electricity Rules for the NSW region from 1730 hrs.
The Actual LOR2 condition is forecast to exist until 18/12/2025 1800 hrs
The capacity reserve required is 700 MW
The minimum reserve available is 673 MW
AEMO is seeking an immediate market response.
An insufficient market response may require AEMO to implement a AEMO intervention event.
Manager NEM Real Time Operations
Actual Lack Of Reserve Level 2 (LOR2) in the NSW region - 18/12/2025
An Actual LOR2 condition has been declared under clause 4.8.4(b) of the National Electricity Rules for the NSW region from 1730 hrs.
The Actual LOR2 condition is forecast to exist until 18/12/2025 1800 hrs
The capacity reserve required is 700 MW
The minimum reserve available is 673 MW
AEMO is seeking an immediate market response.
An insufficient market response may require AEMO to implement a AEMO intervention event.
Manager NEM Real Time Operations
131760INTER-REGIONAL TRANSFER18/12/2025 08:16:45 AM
Inter-regional transfer limit variation - Halys-Braemar 8814 275kV LINE - QLD region - 18/12/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Halys-Braemar 8814 275kV LINE - QLD region - 18/12/2025
At 0759 hrs 18/12/2025 there was an unplanned outage of Halys-Braemar 8814 275kV LINE.
The following constraint set invoked at 0805 hrs 18/12/2025
Q-BRHA
This constraint set contains equations with the following interconnectors on the LHS.
NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Halys-Braemar 8814 275kV LINE - QLD region - 18/12/2025
At 0759 hrs 18/12/2025 there was an unplanned outage of Halys-Braemar 8814 275kV LINE.
The following constraint set invoked at 0805 hrs 18/12/2025
Q-BRHA
This constraint set contains equations with the following interconnectors on the LHS.
NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
131719INTER-REGIONAL TRANSFER16/12/2025 05:49:05 PM
Inter-regional transfer limit variation - Tamworth 1 330kV SVC - NSW region - 16/12/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Tamworth 1 330kV SVC - NSW region - 16/12/2025
At 1642 hrs 16/12/2025 there was an unplanned outage of Tamworth 1 330kV SVC.
The following constraint set invoked at 1650 hrs 16/12/2025
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
Inter-regional transfer limit variation - Tamworth 1 330kV SVC - NSW region - 16/12/2025
At 1642 hrs 16/12/2025 there was an unplanned outage of Tamworth 1 330kV SVC.
The following constraint set invoked at 1650 hrs 16/12/2025
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
131692INTER-REGIONAL TRANSFER16/12/2025 02:08:18 PM
Inter-regional transfer limit variation - Dapto - Sydney South (11) 330kV line- NSW region - 16/12/2025
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Dapto - Sydney South (11) 330kV line- NSW region - 16/12/2025
A planned outage of Dapto - Sydney South (11) 330kV line in the NSW region was scheduled from 0630 hrs 16/12/2025 to 1500 hrs 17/12/2025.
The outage has been completed and Dapto - Sydney South (11) 330kV line returned to service at 1352 hrs 16/12/2025
Constraint set(s) revoked: N-DTSS_11
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Dapto - Sydney South (11) 330kV line- NSW region - 16/12/2025
A planned outage of Dapto - Sydney South (11) 330kV line in the NSW region was scheduled from 0630 hrs 16/12/2025 to 1500 hrs 17/12/2025.
The outage has been completed and Dapto - Sydney South (11) 330kV line returned to service at 1352 hrs 16/12/2025
Constraint set(s) revoked: N-DTSS_11
Manager NEM Real Time Operations
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