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Non-credible contingency event - QLD region - 21/12/2023
Non-credible contingency event - QLD region - 21/12/2023
At 1424 hrs the H14 Middle Ridge 275 kV circuit breakers 5432 and 5422 tripped. This offloaded the H14 Middle Ridge No.2 and No.3 275/110 kV transformers.
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
Reclassification of a Non-Credible Contingency Event: Armidale - Dumaresq 8C 330kV line and Armidale - Sapphire WF 8E 330kV line in NSW1 due to Lightning.
Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.
Region: NSW1
Lines: Armidale - Dumaresq 8C 330kV and Armidale - Sapphire WF 8E 330kV
Duration: 21/12/2023 14:19 until further notice
Constraint set(s) invoked:
N-ARDM_ARSR_1PH_N-2 Constraint set contains the following interconnector(s) on the left hand side:
N-Q-MNSP1
NSW1-QLD1
Auto-generated on behalf of Manager NEM Real Time Operations
[EventId:202312211400_NRM_NSW1_VIC1_started] NEGRES CONSTRAINT NRM_NSW1_VIC1 started operating from 21 December 2023 14:00
Issued by Australian Energy Market Operator Ltd at 1400 hrs on 21 December 2023
ACTUAL NEGATIVE SETTLEMENT RESIDUES - NSW to VIC - 21 December 2023.
Electricity Market outcomes have resulted in the accumulation of negative settlement residues that have exceeded the allowable negative residue threshold for the NSW to VIC directional interconnector.
The negative residue constraint set NRM_NSW1_VIC1 commenced operating from 1400 hrs on 21 December 2023.
This constraint set contains an equation with the following interconnectors on the LHS:
VIC1-NSW1
The RHS of the constraint equation may be adjusted to manage residues.
This is an AEMO autogenerated Market Notice.
Cancellation of a Non-Credible Contingency Event: Armidale - Dumaresq 8C 330kV line and Armidale - Sapphire WF 8E 330kV line in NSW1 due to Lightning.
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: NSW1
Lines: Armidale - Dumaresq 8C 330kV and Armidale - Sapphire WF 8E 330kV
Cancellation time: 21/12/2023 13:59
Constraint set(s) revoked:
N-ARDM_ARSR_1PH_N-2 Constraint set contains the following interconnector(s) on the left hand side:
N-Q-MNSP1
NSW1-QLD1
Refer AEMO Electricity Market Notice 112560
Auto-generated on behalf of Manager NEM Real Time Operations
[EventId:202312211330_NRM_NSW1_VIC1_stopped] NEGRES CONSTRAINT NRM_NSW1_VIC1 ceased operating from 21 December 2023 13:30
Issued by Australian Energy Market Operator Ltd at 1330 hrs on 21 December 2023
CANCELLATION - ACTUAL NEGATIVE SETTLEMENT RESIDUES - NSW to VIC - 21 December 2023.
Refer to market notice: 112562
AEMO has ceased taking action to minimize the further accumulation of negative settlement residues on the NSW to VIC directional interconnector.
The negative residue constraint NRM_NSW1_VIC1 ceased operating at 1330 hrs on 21 December 2023.
This is an AEMO autogenerated Market Notice.
[EventId:202312211250_confirmed] Prices for interval 21-Dec-2023 12:50 are now confirmed
Issued by Australian Energy Market Operator Ltd at 1310 hrs on 21 December 2023
PRICES ARE NOW CONFIRMED for trading interval 21-Dec-2023 12:50.
In accordance with Market Notice 112564 AEMO has reviewed this trading interval and determined that:
- Manifestly Incorrect Inputs did not apply
Prices remain unchanged.
This is an AEMO autogenerated Market Notice.
[EventId:202312211310_confirmed] Prices for interval 21-Dec-2023 13:10 are now confirmed
Issued by Australian Energy Market Operator Ltd at 1310 hrs on 21 December 2023
PRICES ARE NOW CONFIRMED for trading interval 21-Dec-2023 13:10.
In accordance with Market Notice 112568 AEMO has reviewed this trading interval and determined that:
- Manifestly Incorrect Inputs did not apply
Prices remain unchanged.
This is an AEMO autogenerated Market Notice.
[EventId:202312211305_confirmed] Prices for interval 21-Dec-2023 13:05 are now confirmed
Issued by Australian Energy Market Operator Ltd at 1310 hrs on 21 December 2023
PRICES ARE NOW CONFIRMED for trading interval 21-Dec-2023 13:05.
In accordance with Market Notice 112567 AEMO has reviewed this trading interval and determined that:
- Manifestly Incorrect Inputs did not apply
Prices remain unchanged.
This is an AEMO autogenerated Market Notice.
[EventId:202312211300_confirmed] Prices for interval 21-Dec-2023 13:00 are now confirmed
Issued by Australian Energy Market Operator Ltd at 1310 hrs on 21 December 2023
PRICES ARE NOW CONFIRMED for trading interval 21-Dec-2023 13:00.
In accordance with Market Notice 112566 AEMO has reviewed this trading interval and determined that:
- Manifestly Incorrect Inputs did not apply
Prices remain unchanged.
This is an AEMO autogenerated Market Notice.