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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
144165NON-CONFORMANCE29/05/2026 04:10:08 PM
NON-CONFORMANCE Region QLD1 Friday, 29 May 2026
AEMO ELECTRICITY MARKET NOTICE
NON-CONFORMANCE QLD1 Region Friday, 29 May 2026
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_1
Duration: 29/05/2026 16:05 to 29/05/2026 16:10
Amount: -23 MW
Constraint: NC-Q_MPP_1
Auto-generated on behalf of Manager NEM Real Time Operations
NON-CONFORMANCE QLD1 Region Friday, 29 May 2026
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_1
Duration: 29/05/2026 16:05 to 29/05/2026 16:10
Amount: -23 MW
Constraint: NC-Q_MPP_1
Auto-generated on behalf of Manager NEM Real Time Operations
144164MARKET SYSTEMS29/05/2026 03:08:27 PM
Initial - CHG0110742 - Renewal and update of AEMO's FRC Relay server certificate
Change Number: CHG0110742
Notification issued to: Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: Gas Hub
Change Title: Renewal and update of AEMO's FRC Relay server certificate.
Change Start Date & Time: 07/06/2026 10:00:00
Change End Date & Time: 21/06/2026 14:00:00
Outage Start Date & Time: 21/06/2026 10:00:00
Outage End Date & Time: 21/06/2026 14:00:00
Environment: Production
Participant Impact and Requirements: AEMO's FRC Gas Hub web services need to have their server certificates updated every 3 years with new certificates to replace expiring ones.
Participants connecting to these endpoints or receiving requests from AEMO's FRC Gas Hub platforms and have authorisation mechanisms like certificate fingerprinting in place will notice a change in AEMO's server's certificate fingerprint and will need to update their systems accordingly.
The certificate relates to the FRC HUB RELAY, participants WILL need to update the profile that communicates with the FRC HUB RELAY with the new FRC-HUB-RELAY-Prod certificates.
This will need to be done to avoid the inability to send messages to the relay.
The certificates can be downloaded from the link below:
https://www.digicert.com/secure/download-certificate/9wzmqbbws80c42w80hfnvcjvbhgm29v
Support Information:
Report any impacts to the AEMO Information and Support Hub or call 1300 236 600.
Please refer to https://aemo.service-now.com/participantportal?id=pp_services_status for any planned/unplanned maintenance activities.
Notification issued to: Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: Gas Hub
Change Title: Renewal and update of AEMO's FRC Relay server certificate.
Change Start Date & Time: 07/06/2026 10:00:00
Change End Date & Time: 21/06/2026 14:00:00
Outage Start Date & Time: 21/06/2026 10:00:00
Outage End Date & Time: 21/06/2026 14:00:00
Environment: Production
Participant Impact and Requirements: AEMO's FRC Gas Hub web services need to have their server certificates updated every 3 years with new certificates to replace expiring ones.
Participants connecting to these endpoints or receiving requests from AEMO's FRC Gas Hub platforms and have authorisation mechanisms like certificate fingerprinting in place will notice a change in AEMO's server's certificate fingerprint and will need to update their systems accordingly.
The certificate relates to the FRC HUB RELAY, participants WILL need to update the profile that communicates with the FRC HUB RELAY with the new FRC-HUB-RELAY-Prod certificates.
This will need to be done to avoid the inability to send messages to the relay.
The certificates can be downloaded from the link below:
https://www.digicert.com/secure/download-certificate/9wzmqbbws80c42w80hfnvcjvbhgm29v
Support Information:
Report any impacts to the AEMO Information and Support Hub or call 1300 236 600.
Please refer to https://aemo.service-now.com/participantportal?id=pp_services_status for any planned/unplanned maintenance activities.
144163MARKET SYSTEMS29/05/2026 03:03:47 PM
Initial - CHG0110902 - Renewal and update of FBS-Prod-Hub.aemo.com.au server certificate.
Change Number: CHG0110902
Notification issued to: Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: MSATS - Business to Business data exchange
Change Title: Renewal and update of FBS-Prod-Hub.aemo.com.au server certificate.
Change Start Date & Time: 10/06/2026 10:00:00
Change End Date & Time: 14/06/2026 14:00:00
Outage Start Date & Time: 14/06/2026 10:00:00
Outage End Date & Time: 14/06/2026 14:00:00
Environment: Production
Participant Impact and Requirements: AEMO's FRC Gas Hub web services need to have their server certificates updated every year with new certificates to replace the expiring one.
Participants connecting to these endpoints or receiving requests from AEMO's FRC Gas Hub platforms and have authorisation mechanisms like certificate fingerprinting in place will notice a change in AEMO's server's certificate fingerprint and will need to update their systems accordingly.
The certificate relates to "FBS-Prod-Hub.aemo.com.au" certificate and relates to the following domains.
FBS-Prod-Hub.aemo.com.au
apis.prod.aemo.com.au
hub.aemo.com.au
prod.frchub.net
apis.prod.marketnet.net.au
hub.marketnet.net.au
Participants WILL need to update the profile that communicates with the above domains.
This will need to be done to avoid the inability to send messages to the relay.
The certificates can be downloaded from the link below:
https://www.digicert.com/secure/download-certificate/0smqgzf16rvghy1j7qsns4fhlctjzjd
Support Information:
Report any impacts to the AEMO Information and Support Hub or call 1300 236 600.
Please refer to https://aemo.service-now.com/participantportal?id=pp_services_status for any planned/unplanned maintenance activities.
Notification issued to: Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: MSATS - Business to Business data exchange
Change Title: Renewal and update of FBS-Prod-Hub.aemo.com.au server certificate.
Change Start Date & Time: 10/06/2026 10:00:00
Change End Date & Time: 14/06/2026 14:00:00
Outage Start Date & Time: 14/06/2026 10:00:00
Outage End Date & Time: 14/06/2026 14:00:00
Environment: Production
Participant Impact and Requirements: AEMO's FRC Gas Hub web services need to have their server certificates updated every year with new certificates to replace the expiring one.
Participants connecting to these endpoints or receiving requests from AEMO's FRC Gas Hub platforms and have authorisation mechanisms like certificate fingerprinting in place will notice a change in AEMO's server's certificate fingerprint and will need to update their systems accordingly.
The certificate relates to "FBS-Prod-Hub.aemo.com.au" certificate and relates to the following domains.
FBS-Prod-Hub.aemo.com.au
apis.prod.aemo.com.au
hub.aemo.com.au
prod.frchub.net
apis.prod.marketnet.net.au
hub.marketnet.net.au
Participants WILL need to update the profile that communicates with the above domains.
This will need to be done to avoid the inability to send messages to the relay.
The certificates can be downloaded from the link below:
https://www.digicert.com/secure/download-certificate/0smqgzf16rvghy1j7qsns4fhlctjzjd
Support Information:
Report any impacts to the AEMO Information and Support Hub or call 1300 236 600.
Please refer to https://aemo.service-now.com/participantportal?id=pp_services_status for any planned/unplanned maintenance activities.
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
144161NON-CONFORMANCE29/05/2026 10:45:18 AM
NON-CONFORMANCE Region NSW1 Friday, 29 May 2026
AEMO ELECTRICITY MARKET NOTICE
NON-CONFORMANCE NSW1 Region Friday, 29 May 2026
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: NESBESS1
Duration: 29/05/2026 10:40 to 29/05/2026 10:45
Amount: -101 MW
Constraint: NC-N_NESBESS1
Auto-generated on behalf of Manager NEM Real Time Operations
NON-CONFORMANCE NSW1 Region Friday, 29 May 2026
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: NESBESS1
Duration: 29/05/2026 10:40 to 29/05/2026 10:45
Amount: -101 MW
Constraint: NC-N_NESBESS1
Auto-generated on behalf of 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
144159NON-CONFORMANCE28/05/2026 04:10:20 PM
NON-CONFORMANCE Region NSW1 Thursday, 28 May 2026
AEMO ELECTRICITY MARKET NOTICE
NON-CONFORMANCE NSW1 Region Thursday, 28 May 2026
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: NESBESS1
Duration: 28/05/2026 16:05 to 28/05/2026 16:10
Amount: 99 MW
Constraint: NC-N_NESBESS1
Auto-generated on behalf of Manager NEM Real Time Operations
NON-CONFORMANCE NSW1 Region Thursday, 28 May 2026
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: NESBESS1
Duration: 28/05/2026 16:05 to 28/05/2026 16:10
Amount: 99 MW
Constraint: NC-N_NESBESS1
Auto-generated on behalf of Manager NEM Real Time Operations
144158RECLASSIFY CONTINGENCY28/05/2026 09:34:30 AM
Cancellation of a Non-Credible Contingency Event: Mudgeeraba - Terranora No.757 110 kV line and Mudgeeraba - Terranora No.758 110 kV line in QLD1 due to Lightning.
AEMO ELECTRICITY MARKET NOTICE
Cancellation of reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits is no longer reasonably possible. There is no longer any lightning activity in the vicinity of the following lines. Accordingly its classification has reverted to a non-credible contingency event.
Region: QLD1
Lines: Mudgeeraba - Terranora No.757 110 kV and Mudgeeraba - Terranora No.758 110 kV
Cancellation time: 28/05/2026 09:34
Constraint set(s) revoked:
NONE
Refer AEMO Electricity Market Notice 144157
Auto-generated on behalf of Manager NEM Real Time Operations
Cancellation of reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits is no longer reasonably possible. There is no longer any lightning activity in the vicinity of the following lines. Accordingly its classification has reverted to a non-credible contingency event.
Region: QLD1
Lines: Mudgeeraba - Terranora No.757 110 kV and Mudgeeraba - Terranora No.758 110 kV
Cancellation time: 28/05/2026 09:34
Constraint set(s) revoked:
NONE
Refer AEMO Electricity Market Notice 144157
Auto-generated on behalf of Manager NEM Real Time Operations