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108846POWER SYSTEM EVENTS09/07/2023 08:34:15 AM
Non-credible contingency event - Vic region - 09/07/2023
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - Vic region - 09/07/2023
At 0653 hrs the following elements tripped;
- Mortlake PS - Blue Gum 500 kV Line,
- Blue Gum A1 500/220 kV Transformer
- Dundonnell WF tripped.
- MOPS G11 Trans No2 Bus 500 kV CB 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 - Vic region - 09/07/2023
At 0653 hrs the following elements tripped;
- Mortlake PS - Blue Gum 500 kV Line,
- Blue Gum A1 500/220 kV Transformer
- Dundonnell WF tripped.
- MOPS G11 Trans No2 Bus 500 kV CB 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
108788POWER SYSTEM EVENTS29/06/2023 08:51:49 PM
Non-credible contingency event - Vic region - 29/06/2023
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - Vic region - 29/06/2023
At 1454 hrs the Altona - Keilor 220 kV line and the Salt Creek windfarm 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.
AEMO is not satisfied that this non credible event is unlikely to re-occur.
AEMO has therefore reclassified this event as a credible contingency event until further notice.
Region: Vic
Duration: 2045 hrs 29/06/2023 until further notice
Constraint set(s) invoked: Nil
Manager NEM Real Time Operations
Non-credible contingency event - Vic region - 29/06/2023
At 1454 hrs the Altona - Keilor 220 kV line and the Salt Creek windfarm 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.
AEMO is not satisfied that this non credible event is unlikely to re-occur.
AEMO has therefore reclassified this event as a credible contingency event until further notice.
Region: Vic
Duration: 2045 hrs 29/06/2023 until further notice
Constraint set(s) invoked: Nil
Manager NEM Real Time Operations
108414POWER SYSTEM EVENTS08/06/2023 02:56:53 PM
Non-credible contingency event - NSW region - 08/06/2023
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - NSW region - 08/06/2023
At 1433 hrs the Liddell - Tomago 330 kV 82 line and Liddell 330 kV CB 5412 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 - 08/06/2023
At 1433 hrs the Liddell - Tomago 330 kV 82 line and Liddell 330 kV CB 5412 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
108259POWER SYSTEM EVENTS29/05/2023 10:17:37 AM
Non-credible contingency event - Vic region - 29/05/2023
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - Vic region - 29/05/2023
At 0941hrs the Moorabool No1 220kV 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 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
Non-credible contingency event - Vic region - 29/05/2023
At 0941hrs the Moorabool No1 220kV 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 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
108025POWER SYSTEM EVENTS23/05/2023 10:31:42 PM
Non-credible contingency event - Qld region - 23/05/2023
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - Qld region - 23/05/2023
At 2106 hrs the Kamerunga - Woree 7141 132 kV Line and Barron Gorge 1 and 2 generating units tripped. At 2107 hrs the Kamerunga - Barron Gorge 7143 132 kV Line 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 - 23/05/2023
At 2106 hrs the Kamerunga - Woree 7141 132 kV Line and Barron Gorge 1 and 2 generating units tripped. At 2107 hrs the Kamerunga - Barron Gorge 7143 132 kV Line 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
107944POWER SYSTEM EVENTS16/05/2023 10:11:16 PM
Update - Non-credible contingency event - Qld region - 16/05/2023
AEMO ELECTRICITY MARKET NOTICE.
Refer AEMO ELECTRICITY MARKET NOTICE MN107943
At 2142 hrs the H3 Belmont No 2 275 kV 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
Refer AEMO ELECTRICITY MARKET NOTICE MN107943
At 2142 hrs the H3 Belmont No 2 275 kV 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
107943POWER SYSTEM EVENTS16/05/2023 07:07:46 PM
Non-credible contingency event - Qld region - 16/05/2023
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - Qld region - 16/05/2023
At 1852 hrs the H3 Belmont No 2 275 kV 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 - 16/05/2023
At 1852 hrs the H3 Belmont No 2 275 kV 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
107556MARKET SUSPENSION23/04/2023 04:09:49 PM
Declaration of electricity market resumption
AEMO ELECTRICITY MARKET NOTICE
Declaration of electricity market resumption
Refer initial AEMO Electricity Market Notice 107545
AEMO declares that the suspension of the spot market in Victoria will end at 1700 hrs on 23 April 2023.
The TNSP has taken sufficient steps to exclude the original event having influence on market processes and AEMO assesses that the possibility of suspending the spot market within the next 24 hours due to the same cause is minimal. AEMO also determines that it can operate the market in accordance with the provisions of the NER.
Relevant Market Notices issued under this suspension:
107545 and 107550
Manager NEM Real Time Operations
Declaration of electricity market resumption
Refer initial AEMO Electricity Market Notice 107545
AEMO declares that the suspension of the spot market in Victoria will end at 1700 hrs on 23 April 2023.
The TNSP has taken sufficient steps to exclude the original event having influence on market processes and AEMO assesses that the possibility of suspending the spot market within the next 24 hours due to the same cause is minimal. AEMO also determines that it can operate the market in accordance with the provisions of the NER.
Relevant Market Notices issued under this suspension:
107545 and 107550
Manager NEM Real Time Operations
107550MARKET SUSPENSION23/04/2023 02:33:02 AM
Electricity market suspension change of pricing regime
AEMO ELECTRICITY MARKET NOTICE
Electricity market suspension change of pricing regime
Refer initial AEMO Electricity Market Notice 107545
The Spot Market remains suspended in the following regions with the following pricing regimes from Trading Interval 0435 hrs on 23 April 2023 until further notice:
Victoria from Market Suspension Schedule Pricing to Dispatch Pricing (refer NER clause 3.14.5(d))
The cause of the original issue which affected all Victoria SCADA has not yet been resolved and may still influence market processes, hence, the Spot Market suspension will continue at this stage. However, AEMO has determined it is practicable to dispatch and price the suspended region in accordance with NER clauses 3.8 and 3.9.
Relevant Market Notices issued under this suspension:
107545
Manager NEM Real Time Operation
Electricity market suspension change of pricing regime
Refer initial AEMO Electricity Market Notice 107545
The Spot Market remains suspended in the following regions with the following pricing regimes from Trading Interval 0435 hrs on 23 April 2023 until further notice:
Victoria from Market Suspension Schedule Pricing to Dispatch Pricing (refer NER clause 3.14.5(d))
The cause of the original issue which affected all Victoria SCADA has not yet been resolved and may still influence market processes, hence, the Spot Market suspension will continue at this stage. However, AEMO has determined it is practicable to dispatch and price the suspended region in accordance with NER clauses 3.8 and 3.9.
Relevant Market Notices issued under this suspension:
107545
Manager NEM Real Time Operation