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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
144166POWER SYSTEM EVENTS29/05/2026 09:41:16 PM
Update - Non-credible contingency event - QLD region - 29/05/2026
AEMO ELECTRICITY MARKET NOTICE.
Update - Non-credible contingency event - QLD region - 29/05/2026
Refer AEMO Electricity Market Notice 144162
At 2135 hrs the Woolooga to Teebar Creek 8850 275kV Line and the Teebar Ck No2 275kV Bus was returned to service.
The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
Update - Non-credible contingency event - QLD region - 29/05/2026
Refer AEMO Electricity Market Notice 144162
At 2135 hrs the Woolooga to Teebar Creek 8850 275kV Line and the Teebar Ck No2 275kV Bus was returned to service.
The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
144162POWER SYSTEM EVENTS29/05/2026 10:50:40 AM
Non-credible contingency event - QLD region - 29/05/2026
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - QLD region - 29/05/2026
At 1013 hrs the Woolooga to Teebar Creek 8850 275kV Line and the Teebar Ck No2 275kV Bus tripped.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
Non-credible contingency event - QLD region - 29/05/2026
At 1013 hrs the Woolooga to Teebar Creek 8850 275kV Line and the Teebar Ck No2 275kV Bus tripped.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
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
144117POWER SYSTEM EVENTS18/05/2026 01:54:51 PM
Update - Non-credible contingency event -NSW region - 17 May 2026
AEMO ELECTRICITY MARKET NOTICE.
Update - Non-credible contingency event - NSW region - 17/05/2026
Refer AEMO Electricity Market Notice 144112
At 1327 hrs the Upper Tumut Units 1, 2, 3 and 4 were made available to return to service.
The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
Update - Non-credible contingency event - NSW region - 17/05/2026
Refer AEMO Electricity Market Notice 144112
At 1327 hrs the Upper Tumut Units 1, 2, 3 and 4 were made available to return to service.
The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.
AEMO will not reclassify this event as a credible contingency event.
Manager NEM Real Time Operations
144112POWER SYSTEM EVENTS18/05/2026 12:00:40 AM
Non-credible contingency event - NSW region - 17/05/2026
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - NSW region - 17/05/2026
At 2317 hrs the Upper Tumut Units 1, 2, 3 and 4 tripped.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
Non-credible contingency event - NSW region - 17/05/2026
At 2317 hrs the Upper Tumut Units 1, 2, 3 and 4 tripped.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.
The cause of this non credible contingency event is not known at this stage.
Manager NEM Real Time Operations
144107RESERVE NOTICE17/05/2026 02:14:43 PM
PDPASA - Cancellation of the Forecast Lack Of Reserve Level 2 (LOR2) in the QLD Region on 17/05/2026
AEMO ELECTRICITY MARKET NOTICE
The Forecast LOR2 condition in the QLD region advised in AEMO Electricity Market Notice No. 144106 is cancelled at 1400 hrs 17/05/2026.
Manager NEM Real Time Operations
The Forecast LOR2 condition in the QLD region advised in AEMO Electricity Market Notice No. 144106 is cancelled at 1400 hrs 17/05/2026.
Manager NEM Real Time Operations
144106RESERVE NOTICE17/05/2026 01:28:35 PM
PDPASA - Forecast Lack Of Reserve Level 2 (LOR2) in the QLD Region on 18/05/2026
AEMO ELECTRICITY MARKET NOTICE
AEMO declares a Forecast LOR2 condition under clause 4.8.4(b) of the National Electricity Rules for the QLD region for the following Period:
[1.] From 1700 hrs 18/05/2026 to 1900 hrs 18/05/2026.
The forecast capacity reserve requirement is 759 MW.
The minimum capacity reserve available is 357 MW.
AEMO is seeking a market response.
AEMO has not yet estimated the latest time at which it would need to intervene through an AEMO intervention event.
Manager NEM Real Time Operations
AEMO declares a Forecast LOR2 condition under clause 4.8.4(b) of the National Electricity Rules for the QLD region for the following Period:
[1.] From 1700 hrs 18/05/2026 to 1900 hrs 18/05/2026.
The forecast capacity reserve requirement is 759 MW.
The minimum capacity reserve available is 357 MW.
AEMO is seeking a market response.
AEMO has not yet estimated the latest time at which it would need to intervene through an AEMO intervention event.
Manager NEM Real Time Operations
144103RESERVE NOTICE17/05/2026 10:41:04 AM
STPASA - Cancellation of the Forecast Lack Of Reserve Level 2 (LOR2) in the QLD Region on 19/05/2026
AEMO ELECTRICITY MARKET NOTICE
The Forecast LOR2 condition in the QLD region advised in AEMO Electricity Market Notice No. 144093 is cancelled at 1030 hrs 17/05/2026.
Manager NEM Real Time Operations
The Forecast LOR2 condition in the QLD region advised in AEMO Electricity Market Notice No. 144093 is cancelled at 1030 hrs 17/05/2026.
Manager NEM Real Time Operations