Filter by:
Filter by category
Filter by Date
From
To
90966POWER SYSTEM EVENTS22/09/2021 07:44:32 PM
Update - Non-credible contingency event - Torrens Island 66 kV East Bus - SA region - 22/09/2021
AEMO ELECTRICITY MARKET NOTICE.
Update - Non-credible contingency event - Torrens Island 66 kV East Bus - SA region - 22/09/2021
At 1740 hrs the Torrens Island 66 kV East bus tripped. The bus was returned to service at 1846 hrs.
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.
Refer AEMO Electricity Market Notice 90963
Manager NEM Real Time Operations
Update - Non-credible contingency event - Torrens Island 66 kV East Bus - SA region - 22/09/2021
At 1740 hrs the Torrens Island 66 kV East bus tripped. The bus was returned to service at 1846 hrs.
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.
Refer AEMO Electricity Market Notice 90963
Manager NEM Real Time Operations
90965RECLASSIFY CONTINGENCY22/09/2021 07:46:25 PM
Cancellation of the Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event - South East SVC1 and SVC2 - SA Region - 22/09/2021
AEMO ELECTRICITY MARKET NOTICE
Cancellation of the Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event - South East SVC1 and SVC2 - SA Region - 22/09/2021
AEMO considers the simultaneous trip of the following elements is no longer reasonably possible. Accordingly, its classification has reverted to a non-credible contingency event.
Region: SA
Elements: The No. 1 and No. 2 275 kV Static Var Compensator (SVC) at South East Substation.
Cancellation time: 22/09/2021 1935
Constraint set(s) revoked:
S-X_SEVC2+PAVC
The constraint sets contain equations with the following interconnector on the LHS:
V-S-MNSP1
V-SA
Refer AEMO Electricity Market Notice 90951
Manager NEM Real Time Operations
Cancellation of the Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event - South East SVC1 and SVC2 - SA Region - 22/09/2021
AEMO considers the simultaneous trip of the following elements is no longer reasonably possible. Accordingly, its classification has reverted to a non-credible contingency event.
Region: SA
Elements: The No. 1 and No. 2 275 kV Static Var Compensator (SVC) at South East Substation.
Cancellation time: 22/09/2021 1935
Constraint set(s) revoked:
S-X_SEVC2+PAVC
The constraint sets contain equations with the following interconnector on the LHS:
V-S-MNSP1
V-SA
Refer AEMO Electricity Market Notice 90951
Manager NEM Real Time Operations
90964SETTLEMENTS RESIDUE22/09/2021 07:05:31 PM
[EventId:202109221905_NRM_QLD1_NSW1_started] NEGRES CONSTRAINT NRM_QLD1_NSW1 started operating from 22 September 2021 19:05
AEMO ELECTRICITY MARKET NOTICE
Issued by Australian Energy Market Operator Ltd at 1905 hrs on 22 September 2021
ACTUAL NEGATIVE SETTLEMENT RESIDUES - QLD to NSW - 22 September 2021.
Electricity Market outcomes have resulted in the accumulation of negative settlement residues that have exceeded the allowable negative residue threshold for the QLD to NSW directional interconnector.
The negative residue constraint set NRM_QLD1_NSW1 commenced operating from 1905 hrs on 22 September 2021.
This constraint set contains an equation with the following interconnectors on the LHS:
N-Q-MNSP1
NSW1-QLD1
The RHS of the constraint equation may be adjusted to manage residues.
This is an AEMO autogenerated Market Notice.
Issued by Australian Energy Market Operator Ltd at 1905 hrs on 22 September 2021
ACTUAL NEGATIVE SETTLEMENT RESIDUES - QLD to NSW - 22 September 2021.
Electricity Market outcomes have resulted in the accumulation of negative settlement residues that have exceeded the allowable negative residue threshold for the QLD to NSW directional interconnector.
The negative residue constraint set NRM_QLD1_NSW1 commenced operating from 1905 hrs on 22 September 2021.
This constraint set contains an equation with the following interconnectors on the LHS:
N-Q-MNSP1
NSW1-QLD1
The RHS of the constraint equation may be adjusted to manage residues.
This is an AEMO autogenerated Market Notice.
90963POWER SYSTEM EVENTS22/09/2021 06:14:24 PM
Non-credible contingency event - SA region - 22/09/2021
AEMO ELECTRICITY MARKET NOTICE.
Non-credible contingency event - SA region - 22/09/2021
At 1740 hrs the Torrens Island 66 kV East busbar 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 - SA region - 22/09/2021
At 1740 hrs the Torrens Island 66 kV East busbar 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
90962SETTLEMENTS RESIDUE22/09/2021 05:30:28 PM
[EventId:202109221730_NRM_QLD1_NSW1_stopped] NEGRES CONSTRAINT NRM_QLD1_NSW1 ceased operating from 22 September 2021 17:30
AEMO ELECTRICITY MARKET NOTICE
Issued by Australian Energy Market Operator Ltd at 1730 hrs on 22 September 2021
CANCELLATION - ACTUAL NEGATIVE SETTLEMENT RESIDUES - QLD to NSW - 22 September 2021.
Refer to market notice: 90960
AEMO has ceased taking action to minimize the further accumulation of negative settlement residues on the QLD to NSW directional interconnector.
The negative residue constraint NRM_QLD1_NSW1 ceased operating at 1730 hrs on 22 September 2021.
This is an AEMO autogenerated Market Notice.
Issued by Australian Energy Market Operator Ltd at 1730 hrs on 22 September 2021
CANCELLATION - ACTUAL NEGATIVE SETTLEMENT RESIDUES - QLD to NSW - 22 September 2021.
Refer to market notice: 90960
AEMO has ceased taking action to minimize the further accumulation of negative settlement residues on the QLD to NSW directional interconnector.
The negative residue constraint NRM_QLD1_NSW1 ceased operating at 1730 hrs on 22 September 2021.
This is an AEMO autogenerated Market Notice.
90961GENERAL NOTICE22/09/2021 07:02:51 PM
Network Augmentation Commissioned - NSW Region - 22/09/2021
AEMO ELECTRICITY MARKET NOTICE
Network Augmentation Commissioned - NSW Region - 22/09/2021
At Tamworth, a new 330 kV bus section circuit breaker CB 5112 has been commissioned at 1900 hrs 22/09/2021.
Manager NEM Real Time Operations
Network Augmentation Commissioned - NSW Region - 22/09/2021
At Tamworth, a new 330 kV bus section circuit breaker CB 5112 has been commissioned at 1900 hrs 22/09/2021.
Manager NEM Real Time Operations
90960SETTLEMENTS RESIDUE22/09/2021 04:35:15 PM
[EventId:202109221635_NRM_QLD1_NSW1_started] NEGRES CONSTRAINT NRM_QLD1_NSW1 started operating from 22 September 2021 16:35
AEMO ELECTRICITY MARKET NOTICE
Issued by Australian Energy Market Operator Ltd at 1635 hrs on 22 September 2021
ACTUAL NEGATIVE SETTLEMENT RESIDUES - QLD to NSW - 22 September 2021.
Electricity Market outcomes have resulted in the accumulation of negative settlement residues that have exceeded the allowable negative residue threshold for the QLD to NSW directional interconnector.
The negative residue constraint set NRM_QLD1_NSW1 commenced operating from 1635 hrs on 22 September 2021.
This constraint set contains an equation with the following interconnectors on the LHS:
N-Q-MNSP1
NSW1-QLD1
The RHS of the constraint equation may be adjusted to manage residues.
This is an AEMO autogenerated Market Notice.
Issued by Australian Energy Market Operator Ltd at 1635 hrs on 22 September 2021
ACTUAL NEGATIVE SETTLEMENT RESIDUES - QLD to NSW - 22 September 2021.
Electricity Market outcomes have resulted in the accumulation of negative settlement residues that have exceeded the allowable negative residue threshold for the QLD to NSW directional interconnector.
The negative residue constraint set NRM_QLD1_NSW1 commenced operating from 1635 hrs on 22 September 2021.
This constraint set contains an equation with the following interconnectors on the LHS:
N-Q-MNSP1
NSW1-QLD1
The RHS of the constraint equation may be adjusted to manage residues.
This is an AEMO autogenerated Market Notice.
90956MARKET INTERVENTION22/09/2021 04:51:21 PM
Direction - SA Region - 22/09/2021
AEMO ELECTRICITY MARKET NOTICE
Direction - SA Region - 22/09/2021
In accordance with section 116 of the National Electricity Law, AEMO has issued a direction to a participant in the SA region. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a).
The direction was necessary to maintain the power system in a secure operating state.
AEMO may issue or revoke additional directions in order to meet the current requirement, unless sufficient market response is provided. A further market notice will be issued when all directions related to this requirement have been cancelled.
The issue of the direction commences an AEMO intervention event. AEMO declares all dispatch intervals during the event to be intervention dispatch intervals, commencing from the interval ending 1705 hrs on 22/09/2021.
Intervention pricing does not apply to this AEMO intervention event.
Manager NEM Real Time Operations
Direction - SA Region - 22/09/2021
In accordance with section 116 of the National Electricity Law, AEMO has issued a direction to a participant in the SA region. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a).
The direction was necessary to maintain the power system in a secure operating state.
AEMO may issue or revoke additional directions in order to meet the current requirement, unless sufficient market response is provided. A further market notice will be issued when all directions related to this requirement have been cancelled.
The issue of the direction commences an AEMO intervention event. AEMO declares all dispatch intervals during the event to be intervention dispatch intervals, commencing from the interval ending 1705 hrs on 22/09/2021.
Intervention pricing does not apply to this AEMO intervention event.
Manager NEM Real Time Operations
90955POWER SYSTEM EVENTS22/09/2021 02:38:44 PM
Update - Non-credible contingency event - VIC region - 22/09/2021
AEMO ELECTRICITY MARKET NOTICE
Update - Non-credible contingency event - VIC region - 22/09/2021
At 0916 hrs the Springvale No. 1 220 kV busbar tripped.
Refer AEMO ELECTRICITY MARKET NOTICE MN90937 and MN90939
At 0925 hrs the Springvale No. 1 220 kV busbar was returned to service.
Further investigation has identified that this was a credible contingency event.
Manager NEM Real Time Operations
Update - Non-credible contingency event - VIC region - 22/09/2021
At 0916 hrs the Springvale No. 1 220 kV busbar tripped.
Refer AEMO ELECTRICITY MARKET NOTICE MN90937 and MN90939
At 0925 hrs the Springvale No. 1 220 kV busbar was returned to service.
Further investigation has identified that this was a credible contingency event.
Manager NEM Real Time Operations