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127343RECLASSIFY CONTINGENCY31/05/2025 05:02:27 PM
Reclassification of non-credible contingency event due to existence of widespread abnormal conditions - All NEM regions.
AEMO ELECTRICITY MARKET NOTICE.
AEMO has identified that a non-credible contingency event impacting the power system is more likely to occur and is considered reasonably possible because of the existence of widespread abnormal conditions namely Severe Space Weather Watch in all NEM regions.
AEMO has therefore reclassified the occurrence of a non-credible contingency event involving multiple plant due to these abnormal conditions as credible.
Need for further measures is being monitored and further measures may be implemented in line with the Power System Security Guidelines (SO_OP_3715).
Manager NEM Real Time Operations
AEMO has identified that a non-credible contingency event impacting the power system is more likely to occur and is considered reasonably possible because of the existence of widespread abnormal conditions namely Severe Space Weather Watch in all NEM regions.
AEMO has therefore reclassified the occurrence of a non-credible contingency event involving multiple plant due to these abnormal conditions as credible.
Need for further measures is being monitored and further measures may be implemented in line with the Power System Security Guidelines (SO_OP_3715).
Manager NEM Real Time Operations
127341NON-CONFORMANCE31/05/2025 12:50:15 PM
NON-CONFORMANCE Region QLD1 Saturday, 31 May 2025
AEMO ELECTRICITY MARKET NOTICE
NON-CONFORMANCE QLD1 Region Saturday, 31 May 2025
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_2
Duration: 31/05/2025 12:30 to 31/05/2025 12:50
Amount: 10 MW
Constraint: NC-Q_MPP_2
Auto-generated on behalf of Manager NEM Real Time Operations
NON-CONFORMANCE QLD1 Region Saturday, 31 May 2025
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_2
Duration: 31/05/2025 12:30 to 31/05/2025 12:50
Amount: 10 MW
Constraint: NC-Q_MPP_2
Auto-generated on behalf of Manager NEM Real Time Operations
127340NON-CONFORMANCE30/05/2025 11:00:14 PM
NON-CONFORMANCE Region QLD1 Friday, 30 May 2025
AEMO ELECTRICITY MARKET NOTICE
NON-CONFORMANCE QLD1 Region Friday, 30 May 2025
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_2
Duration: 30/05/2025 22:25 to 30/05/2025 23:00
Amount: -32 MW
Constraint: NC-Q_MPP_2
Auto-generated on behalf of Manager NEM Real Time Operations
NON-CONFORMANCE QLD1 Region Friday, 30 May 2025
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_2
Duration: 30/05/2025 22:25 to 30/05/2025 23:00
Amount: -32 MW
Constraint: NC-Q_MPP_2
Auto-generated on behalf of Manager NEM Real Time Operations
127337NON-CONFORMANCE30/05/2025 01:00:13 PM
NON-CONFORMANCE Region QLD1 Friday, 30 May 2025
AEMO ELECTRICITY MARKET NOTICE
NON-CONFORMANCE QLD1 Region Friday, 30 May 2025
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_1
Duration: 30/05/2025 11:50 to 30/05/2025 13:00
Amount: -63 MW
Constraint: NC-Q_MPP_1
Auto-generated on behalf of Manager NEM Real Time Operations
NON-CONFORMANCE QLD1 Region Friday, 30 May 2025
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_1
Duration: 30/05/2025 11:50 to 30/05/2025 13:00
Amount: -63 MW
Constraint: NC-Q_MPP_1
Auto-generated on behalf of Manager NEM Real Time Operations
127333RECLASSIFY CONTINGENCY29/05/2025 04:58:51 PM
Cancellation of the Reclassification of a Non-Credible Contingency Event: Loss of the Sheffield - Burnie No. 1 220kV Line, Sheffield - Burnie No. 2 110kV Line and the Ulverstone - Emu Bay 110kV Line in TAS1 due to lightning
AEMO ELECTRICITY MARKET NOTICE
Cancellation of reclassification of a Non-Credible Contingency Event as a Credible Contingency Event .
Based on advice received from the asset owner, AEMO no longer considers the trip of the Sheffield - Burnie No. 1 220kV Line, Sheffield - Burnie No. 2 110kV Line and the Ulverstone - Emu Bay 110kV Line in TAS1 due to lightning as a credible contingency when there is lightning activity in the vicinity.
Accordingly the reclassification as a credible contingency is cancelled .
Region: TAS1
Element: Sheffield - Burnie No. 1 220kV Line, Sheffield - Burnie No. 2 110kV Line and the Ulverstone - Emu Bay 110kV Line
Cancellation time: 29/05/2025 1600 hrs
Constraint set(s) revoked: NONE
Refer AEMO Electricity Market Notices 125566
Manager NEM Real Time Operations
Cancellation of reclassification of a Non-Credible Contingency Event as a Credible Contingency Event .
Based on advice received from the asset owner, AEMO no longer considers the trip of the Sheffield - Burnie No. 1 220kV Line, Sheffield - Burnie No. 2 110kV Line and the Ulverstone - Emu Bay 110kV Line in TAS1 due to lightning as a credible contingency when there is lightning activity in the vicinity.
Accordingly the reclassification as a credible contingency is cancelled .
Region: TAS1
Element: Sheffield - Burnie No. 1 220kV Line, Sheffield - Burnie No. 2 110kV Line and the Ulverstone - Emu Bay 110kV Line
Cancellation time: 29/05/2025 1600 hrs
Constraint set(s) revoked: NONE
Refer AEMO Electricity Market Notices 125566
Manager NEM Real Time Operations
127326NON-CONFORMANCE28/05/2025 06:00:15 PM
NON-CONFORMANCE Region QLD1 Wednesday, 28 May 2025
AEMO ELECTRICITY MARKET NOTICE
NON-CONFORMANCE QLD1 Region Wednesday, 28 May 2025
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_1
Duration: 28/05/2025 17:55 to 28/05/2025 18:00
Amount: -20 MW
Constraint: NC-Q_MPP_1
Auto-generated on behalf of Manager NEM Real Time Operations
NON-CONFORMANCE QLD1 Region Wednesday, 28 May 2025
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_1
Duration: 28/05/2025 17:55 to 28/05/2025 18:00
Amount: -20 MW
Constraint: NC-Q_MPP_1
Auto-generated on behalf of Manager NEM Real Time Operations
127322NON-CONFORMANCE28/05/2025 03:15:14 PM
NON-CONFORMANCE Region QLD1 Wednesday, 28 May 2025
AEMO ELECTRICITY MARKET NOTICE
NON-CONFORMANCE QLD1 Region Wednesday, 28 May 2025
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_2
Duration: 28/05/2025 12:30 to 28/05/2025 15:15
Amount: 26 MW
Constraint: NC-Q_MPP_2
Auto-generated on behalf of Manager NEM Real Time Operations
NON-CONFORMANCE QLD1 Region Wednesday, 28 May 2025
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_2
Duration: 28/05/2025 12:30 to 28/05/2025 15:15
Amount: 26 MW
Constraint: NC-Q_MPP_2
Auto-generated on behalf of Manager NEM Real Time Operations
127321NON-CONFORMANCE28/05/2025 02:35:19 AM
NON-CONFORMANCE Region QLD1 Wednesday, 28 May 2025
AEMO ELECTRICITY MARKET NOTICE
NON-CONFORMANCE QLD1 Region Wednesday, 28 May 2025
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_2
Duration: 28/05/2025 01:35 to 28/05/2025 02:35
Amount: 24 MW
Constraint: NC-Q_MPP_2
Auto-generated on behalf of Manager NEM Real Time Operations
NON-CONFORMANCE QLD1 Region Wednesday, 28 May 2025
AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:
Unit: MPP_2
Duration: 28/05/2025 01:35 to 28/05/2025 02:35
Amount: 24 MW
Constraint: NC-Q_MPP_2
Auto-generated on behalf of Manager NEM Real Time Operations
127304POWER SYSTEM EVENTS27/05/2025 12:30:40 PM
Update - Non-credible contingency event - NSW region - 07/03/2025
AEMO ELECTRICITY MARKET NOTICE.
Update - Non-credible contingency event - NSW region - 07/03/2025
Refer AEMO Electricity Market Notice 125536
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 no longer reclassify this event as a credible contingency event.
Region: NSW
Elements:
- Lismore132 - Mullumbimby 9U6 132kV Line
- Lismore132 - Mullumbimby 9U7 132kV Line
- Ewingsdale - Mullumbimby 9G5 132kV Line
Duration: 1730 hrs 11/03/2025 until 1230 hrs 27/05/2025
Constraint set(s) invoked: NONE
Manager NEM Real Time Operations
Update - Non-credible contingency event - NSW region - 07/03/2025
Refer AEMO Electricity Market Notice 125536
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 no longer reclassify this event as a credible contingency event.
Region: NSW
Elements:
- Lismore132 - Mullumbimby 9U6 132kV Line
- Lismore132 - Mullumbimby 9U7 132kV Line
- Ewingsdale - Mullumbimby 9G5 132kV Line
Duration: 1730 hrs 11/03/2025 until 1230 hrs 27/05/2025
Constraint set(s) invoked: NONE
Manager NEM Real Time Operations