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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
90954CONSTRAINTS22/09/2021 03:08:54 PM
Update to system normal constraint equation in NSW for voltage collapse at Darlington Point
AEMO ELECTRICITY MARKET NOTICE
Refer to Market Notice 75618
TransGrid has advised AEMO on a revision to the Darlington Point to Wagga (63) 330 kV line voltage collapse limit due to upcoming connection of Hillston solar farm.
AEMO has reviewed the limit advice and will update the following constraint equation at 1000 hrs Thursday 23rd September 2021:
N^^N_NIL_2
The limit is for pre-contingent flow on 63 line. The constraint equation includes generators in south-west NSW and north-west Victoria on the left-hand side as well as Murraylink.
Mahsa Ahmadi
AEMO Operations
Refer to Market Notice 75618
TransGrid has advised AEMO on a revision to the Darlington Point to Wagga (63) 330 kV line voltage collapse limit due to upcoming connection of Hillston solar farm.
AEMO has reviewed the limit advice and will update the following constraint equation at 1000 hrs Thursday 23rd September 2021:
N^^N_NIL_2
The limit is for pre-contingent flow on 63 line. The constraint equation includes generators in south-west NSW and north-west Victoria on the left-hand side as well as Murraylink.
Mahsa Ahmadi
AEMO Operations
90953MARKET INTERVENTION22/09/2021 02:15:58 PM
Possible intervention to manage power system security in South Australia (SA) Region
AEMO ELECTRICITY MARKET NOTICE
Possible intervention to manage power system security in South Australia (SA) Region
The synchronous generating units currently expected to be synchronised in SA from 0130 hrs 23/09/2021 to 0400 hrs 24/09/2021 will be inadequate to maintain sufficient system strength in SA and hence a secure operating state.
AEMO estimates that, in the absence of sufficient market response by 1700 hrs 22/09/2021, AEMO may need to intervene by issuing a direction requiring one or more SA synchronous generating unit(s) to operate or remain synchronised to maintain power system security in SA.
Manager NEM Real Time Operations
Possible intervention to manage power system security in South Australia (SA) Region
The synchronous generating units currently expected to be synchronised in SA from 0130 hrs 23/09/2021 to 0400 hrs 24/09/2021 will be inadequate to maintain sufficient system strength in SA and hence a secure operating state.
AEMO estimates that, in the absence of sufficient market response by 1700 hrs 22/09/2021, AEMO may need to intervene by issuing a direction requiring one or more SA synchronous generating unit(s) to operate or remain synchronised to maintain power system security in SA.
Manager NEM Real Time Operations