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144186CONSTRAINTS02/06/2026 02:03:25 PM
Increase in Heywood from SA to Vic test limit from 550 to 600 MW
AEMO ELECTRICITY MARKET NOTICE
AEMO will increase the Heywood test limit from SA to Vic (from the current 550 MW) to 600 MW today to conduct internetwork testing on Heywood.
The following constraint sets will be revoked once the testing criteria met:
I-SV_HEY_550_TEST
The following constraint sets will be invoked:
I-SV_HEY_600_TEST
AEMO will revert the Heywood test limit back to 550 MW once the test has completed while the test result being analysed.
Please also refer to the published formal PEC Stage 1 and HIC capacity release testing information at the following link: 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.
Terry Liu
AEMO Operations
AEMO will increase the Heywood test limit from SA to Vic (from the current 550 MW) to 600 MW today to conduct internetwork testing on Heywood.
The following constraint sets will be revoked once the testing criteria met:
I-SV_HEY_550_TEST
The following constraint sets will be invoked:
I-SV_HEY_600_TEST
AEMO will revert the Heywood test limit back to 550 MW once the test has completed while the test result being analysed.
Please also refer to the published formal PEC Stage 1 and HIC capacity release testing information at the following link: 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.
Terry Liu
AEMO Operations
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
144142CONSTRAINTS25/05/2026 02:50:50 PM
Updated system normal constraints to manage Murraylink dynamic rating forecast in pre-dispatch and PASA
Refer to Market Notice 134696
AEMO has now completed the production of the Murraylink dynamic rating forecast model and the forecasting performance has been satisfactory during the test. AEMO will be enabling the pre-dispatch and PASA formulation using the Murraylink dynamic rating forecast on the following two constraint equations at 1000 hrs on Wednesday 27th May 2026.
VSML_RAT_LIM_DYN
SVML_RAT_LIM_DYN
For full details on the formulation, the updated constraint equations have now been loaded into AEMO's pre-production systems.
Terry Liu
AEMO Operations
AEMO has now completed the production of the Murraylink dynamic rating forecast model and the forecasting performance has been satisfactory during the test. AEMO will be enabling the pre-dispatch and PASA formulation using the Murraylink dynamic rating forecast on the following two constraint equations at 1000 hrs on Wednesday 27th May 2026.
VSML_RAT_LIM_DYN
SVML_RAT_LIM_DYN
For full details on the formulation, the updated constraint equations have now been loaded into AEMO's pre-production systems.
Terry Liu
AEMO Operations
144138MARKET INTERVENTION24/05/2026 12:17:26 PM
Cancellation - AEMO Intervention Event - SA region 24/05/2026
AEMO ELECTRICITY MARKET NOTICE
Cancellation - AEMO Intervention Event - SA region 24/05/2026
Refer to Market Notice 144136
The AEMO Intervention Event and all associated directions are cancelled from 1220 hrs on 24/05/2026.
Manager NEM Real Time Operations
Cancellation - AEMO Intervention Event - SA region 24/05/2026
Refer to Market Notice 144136
The AEMO Intervention Event and all associated directions are cancelled from 1220 hrs on 24/05/2026.
Manager NEM Real Time Operations
144137MARKET INTERVENTION24/05/2026 12:16:55 PM
Cancellation: Direction issued to: AGL SA Generation Pty Limited - BARKER INLET PS
AEMO ELECTRICITY MARKET NOTICE
Cancellation: Direction issued to: AGL SA Generation Pty Limited - BARKER INLET PS
Refer to Market Notice 144135
Direction is cancelled from: 1220 hrs 24/05/2026
Manager NEM Real Time Operations
Cancellation: Direction issued to: AGL SA Generation Pty Limited - BARKER INLET PS
Refer to Market Notice 144135
Direction is cancelled from: 1220 hrs 24/05/2026
Manager NEM Real Time Operations
144136MARKET INTERVENTION24/05/2026 04:16:17 AM
Direction - SA region 24/05/2026
AEMO ELECTRICITY MARKET NOTICE
Direction - SA region 24/05/2026
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 0405 hrs on 24/05/2026.
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 24/05/2026
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 0405 hrs on 24/05/2026.
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