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Reclassification of non-credible contingency event due to existence of widespread abnormal conditions - SA region.
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 weather in the SA region.
AEMO has therefore reclassified the occurrence of a non-credible contingency event involving multiple plant due to these abnormal conditions as credible.
AEMO has taken the following action to maintain power system security at 1050 hrs 08/12/2023.
Constraint set invoked: I-VS_250
Duration: 1050 hrs 08/12/2023. until further notice
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
[EventId:202312081010_confirmed] Prices for interval 08-Dec-2023 10:10 are now confirmed
Issued by Australian Energy Market Operator Ltd at 1035 hrs on 8 December 2023
PRICES ARE NOW CONFIRMED for trading interval 08-Dec-2023 10:10.
In accordance with Market Notice 112060 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:202312081035_confirmed] Prices for interval 08-Dec-2023 10:35 are now confirmed
Issued by Australian Energy Market Operator Ltd at 1035 hrs on 8 December 2023
PRICES ARE NOW CONFIRMED for trading interval 08-Dec-2023 10:35.
In accordance with Market Notice 112067 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:202312081030_confirmed] Prices for interval 08-Dec-2023 10:30 are now confirmed
Issued by Australian Energy Market Operator Ltd at 1035 hrs on 8 December 2023
PRICES ARE NOW CONFIRMED for trading interval 08-Dec-2023 10:30.
In accordance with Market Notice 112066 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:202312081025_confirmed] Prices for interval 08-Dec-2023 10:25 are now confirmed
Issued by Australian Energy Market Operator Ltd at 1035 hrs on 8 December 2023
PRICES ARE NOW CONFIRMED for trading interval 08-Dec-2023 10:25.
In accordance with Market Notice 112064 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:202312081020_confirmed] Prices for interval 08-Dec-2023 10:20 are now confirmed
Issued by Australian Energy Market Operator Ltd at 1035 hrs on 8 December 2023
PRICES ARE NOW CONFIRMED for trading interval 08-Dec-2023 10:20.
In accordance with Market Notice 112062 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:202312081015_confirmed] Prices for interval 08-Dec-2023 10:15 are now confirmed
Issued by Australian Energy Market Operator Ltd at 1035 hrs on 8 December 2023
PRICES ARE NOW CONFIRMED for trading interval 08-Dec-2023 10:15.
In accordance with Market Notice 112061 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:202312081015_NRM_NSW1_VIC1_started] NEGRES CONSTRAINT NRM_NSW1_VIC1 started operating from 08 December 2023 10:15
Issued by Australian Energy Market Operator Ltd at 1015 hrs on 8 December 2023
ACTUAL NEGATIVE SETTLEMENT RESIDUES - NSW to VIC - 8 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 1015 hrs on 8 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.
Reclassification of a Non-Credible Contingency Event: Loss of Sheffield 220 kV switchyard (all 220 kV buses) in Tas due to planned work
Reclassification of a non-credible contingency event as a credible contingency event due to planned work.
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:TAS
Plant: Sheffield 220 kV switchyard (all 220 kV buses)
Duration: 08/12/2023 : 1000 hrs until further notice
Constraint set(s) invoked: T:SH_220_N-2
Manager NEM Real Time Operations