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144182SETTLEMENTS RESIDUE01/06/2026 08:00:21 PM
[EventId:202606012000_NRM_VIC1_NSW1_stopped] NEGRES CONSTRAINT NRM_VIC1_NSW1 ceased operating from 01 June 2026 20:00
AEMO ELECTRICITY MARKET NOTICE
Issued by Australian Energy Market Operator Ltd at 2000 hrs on 1 June 2026
CANCELLATION - ACTUAL NEGATIVE SETTLEMENT RESIDUES - VIC to NSW - 1 June 2026.
Refer to market notice: 144181
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 2000 hrs on 1 June 2026.
This is an AEMO autogenerated Market Notice.
Issued by Australian Energy Market Operator Ltd at 2000 hrs on 1 June 2026
CANCELLATION - ACTUAL NEGATIVE SETTLEMENT RESIDUES - VIC to NSW - 1 June 2026.
Refer to market notice: 144181
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 2000 hrs on 1 June 2026.
This is an AEMO autogenerated Market Notice.
144181SETTLEMENTS RESIDUE01/06/2026 06:20:20 PM
[EventId:202606011820_NRM_VIC1_NSW1_started] NEGRES CONSTRAINT NRM_VIC1_NSW1 started operating from 01 June 2026 18:20
AEMO ELECTRICITY MARKET NOTICE
Issued by Australian Energy Market Operator Ltd at 1820 hrs on 1 June 2026
ACTUAL NEGATIVE SETTLEMENT RESIDUES - VIC to NSW - 1 June 2026.
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 1820 hrs on 1 June 2026.
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.
Issued by Australian Energy Market Operator Ltd at 1820 hrs on 1 June 2026
ACTUAL NEGATIVE SETTLEMENT RESIDUES - VIC to NSW - 1 June 2026.
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 1820 hrs on 1 June 2026.
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.
144172MARKET INTERVENTION31/05/2026 11:15:08 PM
Cancellation: Direction issued to: Origin Energy Electricity Limited - QUARANTINE PS UNIT 5
AEMO ELECTRICITY MARKET NOTICE
Cancellation: Direction issued to: Origin Energy Electricity Limited - QUARANTINE PS UNIT 5
Refer to Market Notice 144169
Direction is cancelled from: 2315 hrs 31/05/2026
Manager NEM Real Time Operations
Cancellation: Direction issued to: Origin Energy Electricity Limited - QUARANTINE PS UNIT 5
Refer to Market Notice 144169
Direction is cancelled from: 2315 hrs 31/05/2026
Manager NEM Real Time Operations
144171MARKET INTERVENTION31/05/2026 11:15:28 PM
Cancellation - AEMO Intervention Event - SA region 31/05/2026
AEMO ELECTRICITY MARKET NOTICE
Cancellation - AEMO Intervention Event - SA region 31/05/2026
Refer to Market Notice 144170
The AEMO Intervention Event and all associated directions are cancelled from 2315 hrs on 31/05/2026.
Manager NEM Real Time Operations
Cancellation - AEMO Intervention Event - SA region 31/05/2026
Refer to Market Notice 144170
The AEMO Intervention Event and all associated directions are cancelled from 2315 hrs on 31/05/2026.
Manager NEM Real Time Operations
144170MARKET INTERVENTION31/05/2026 09:54:31 PM
Direction - SA region 31/05/2026
AEMO ELECTRICITY MARKET NOTICE
Direction - SA region 31/05/2026
In accordance with section 116 of the National Electricity Law, AEMO has issued a direction to a participant in the SA region. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a1)(1).
The issue of the direction commences an AEMO intervention event. AEMO declares all trading intervals during the event to be intervention trading intervals, commencing from the interval ending 2150 hrs on 31/05/2026.
Intervention pricing does not apply to this AEMO intervention event.
AEMO may issue or revoke additional directions in order to meet the current requirement, unless sufficient market response is provided. A further market notice will be issued when all directions related to this requirement have been cancelled.
Manager NEM Real Time Operations
Direction - SA region 31/05/2026
In accordance with section 116 of the National Electricity Law, AEMO has issued a direction to a participant in the SA region. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a1)(1).
The issue of the direction commences an AEMO intervention event. AEMO declares all trading intervals during the event to be intervention trading intervals, commencing from the interval ending 2150 hrs on 31/05/2026.
Intervention pricing does not apply to this AEMO intervention event.
AEMO may issue or revoke additional directions in order to meet the current requirement, unless sufficient market response is provided. A further market notice will be issued when all directions related to this requirement have been cancelled.
Manager NEM Real Time Operations
144169MARKET INTERVENTION31/05/2026 09:53:51 PM
Direction - in SA region to Origin Energy Electricity Limited - QUARANTINE PS UNIT 5
AEMO ELECTRICITY MARKET NOTICE
Direction - in SA region to Origin Energy Electricity Limited - QUARANTINE PS UNIT 5
In accordance with section 116 of the National Electricity Law, AEMO is issuing a direction to Origin Energy Electricity Limited. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a1)(1).
Direction issued to: Origin Energy Electricity Limited - QUARANTINE PS UNIT 5 at 2145hrs 31/05/2026
Type of resource: generating unit
Required actions: Remain Synchronised and follow dispatch targets at 2200 hrs 31/05/2026
Services provided: Voltage Control
Circumstances necessitating the Direction: Voltage
Circumstances necessitating the Direction additional detail: The synchronous generating units currently expected to be synchronised in SA will be inadequate to maintain sufficient Voltage Control in SA. Intervention is required to maintain the power system in a secure operating state
Expected duration: 2330 hrs 31/05/2026.
Origin Energy Electricity Limited does not incur any civil monetary liability for a relevant action taken in accordance with this direction unless the action is taken in bad faith.
Manager NEM Real Time Operations
Direction - in SA region to Origin Energy Electricity Limited - QUARANTINE PS UNIT 5
In accordance with section 116 of the National Electricity Law, AEMO is issuing a direction to Origin Energy Electricity Limited. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a1)(1).
Direction issued to: Origin Energy Electricity Limited - QUARANTINE PS UNIT 5 at 2145hrs 31/05/2026
Type of resource: generating unit
Required actions: Remain Synchronised and follow dispatch targets at 2200 hrs 31/05/2026
Services provided: Voltage Control
Circumstances necessitating the Direction: Voltage
Circumstances necessitating the Direction additional detail: The synchronous generating units currently expected to be synchronised in SA will be inadequate to maintain sufficient Voltage Control in SA. Intervention is required to maintain the power system in a secure operating state
Expected duration: 2330 hrs 31/05/2026.
Origin Energy Electricity Limited does not incur any civil monetary liability for a relevant action taken in accordance with this direction unless the action is taken in bad faith.
Manager NEM Real Time Operations
144160INTER-REGIONAL TRANSFER29/05/2026 09:48:13 AM
Inter-regional transfer limit variation - Heywood M1 500/275kV XFMR - VIC region - 29/05/2026
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Heywood M1 500/275kV XFMR - VIC region - 29/05/2026
A planned outage of Heywood M1 500/275kV XFMR in the VIC region was scheduled from 1100 hrs 25/05/2026 to 1800 hrs 29/05/2026.
The outage has been completed and Heywood M1 500/275kV XFMR returned to service at 0920 hrs 29/05/2026
Constraint set(s) revoked: V-HYTX_M12
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Heywood M1 500/275kV XFMR - VIC region - 29/05/2026
A planned outage of Heywood M1 500/275kV XFMR in the VIC region was scheduled from 1100 hrs 25/05/2026 to 1800 hrs 29/05/2026.
The outage has been completed and Heywood M1 500/275kV XFMR returned to service at 0920 hrs 29/05/2026
Constraint set(s) revoked: V-HYTX_M12
Manager NEM Real Time Operations
144141INTER-REGIONAL TRANSFER25/05/2026 11:34:48 AM
Inter-regional transfer limit variation - Koorangie to Wemen 220 kV Line - VIC region - 25/05/2026
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Koorangie to Wemen 220 kV Line - VIC region - 25/05/2026
At 1130 hrs 25/05/2026 there was a short notice outage of Koorangie to Wemen 220 kV Line.
The following constraint set(s) invoked at 1130 hrs 25/05/2026
V-KOWE
This constraint set(s) contains equations with the following interconnectors on the LHS.
V-S-MNSP1,T-V-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 - Koorangie to Wemen 220 kV Line - VIC region - 25/05/2026
At 1130 hrs 25/05/2026 there was a short notice outage of Koorangie to Wemen 220 kV Line.
The following constraint set(s) invoked at 1130 hrs 25/05/2026
V-KOWE
This constraint set(s) contains equations with the following interconnectors on the LHS.
V-S-MNSP1,T-V-MNSP1,V-SA,VIC1-NSW1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
144139INTER-REGIONAL TRANSFER24/05/2026 01:04:22 PM
Inter-regional transfer limit variation - Tailem Bend 275 kV East Bus - SA region - 24/05/2026
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation - Tailem Bend 275 kV East Bus - SA region - 24/05/2026
At 1250 hrs 24/05/2026 there was a short notice outage of Tailem Bend 275 kV East Bus.
The following constraint set(s) invoked at 1250 hrs 24/05/2026
S-TB275_E_BUS
This constraint set(s) contains equations with the following interconnectors on the LHS.
V-SA
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
Inter-regional transfer limit variation - Tailem Bend 275 kV East Bus - SA region - 24/05/2026
At 1250 hrs 24/05/2026 there was a short notice outage of Tailem Bend 275 kV East Bus.
The following constraint set(s) invoked at 1250 hrs 24/05/2026
S-TB275_E_BUS
This constraint set(s) contains equations with the following interconnectors on the LHS.
V-SA
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations