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75329MARKET INTERVENTION12/04/2020 02:15:24 PM
Cancellation - AEMO Intervention Event - Intervention dispatch intervals - Direction SA region - 11/04/2020
AEMO ELECTRICITY MARKET NOTICE
Refer Market Notice 75322
The AEMO Intervention Event and all associated directions are cancelled from 1400 hrs 12/04/2020.
Manager NEM Real Time Operation
Refer Market Notice 75322
The AEMO Intervention Event and all associated directions are cancelled from 1400 hrs 12/04/2020.
Manager NEM Real Time Operation
75327POWER SYSTEM EVENTS12/04/2020 01:39:59 PM
Update - Non-credible contingency event - Vic region 11/04/2020
AEMO ELECTRICITY MARKET NOTICE.
Refer market notice 75304
A non-credible contingency event occurred in the Vic region on 11/04/2020
At Yallourn Power Station the following units tripped:
Yallourn Unit 3 tripped at 1326 hrs, Yallourn Unit 1 tripped at 1328 hrs, Yallourn Unit 4 tripped at 1328 hrs
At 1326 hrs Macarthur Wind Farm 4 collector groups (300 MW) disconnected.
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 market notice 75304
A non-credible contingency event occurred in the Vic region on 11/04/2020
At Yallourn Power Station the following units tripped:
Yallourn Unit 3 tripped at 1326 hrs, Yallourn Unit 1 tripped at 1328 hrs, Yallourn Unit 4 tripped at 1328 hrs
At 1326 hrs Macarthur Wind Farm 4 collector groups (300 MW) disconnected.
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
75326NON-CONFORMANCE12/04/2020 10:30:14 AM
NON-CONFORMANCE Region NSW1 Sunday, 12 April 2020
AEMO ELECTRICITY MARKET NOTICE
NON-CONFORMANCE NSW1 Region Sunday, 12 April 2020
AEMO declared a schedule generating unit non-conforming
Unit: VP5
Duration: 12/04/2020 10:20 to 12/04/2020 10:30
Amount: 29 MW
Constraint: NC-N_VP5
Auto-generated on behalf of Manager NEM Real Time Operations
NON-CONFORMANCE NSW1 Region Sunday, 12 April 2020
AEMO declared a schedule generating unit non-conforming
Unit: VP5
Duration: 12/04/2020 10:20 to 12/04/2020 10:30
Amount: 29 MW
Constraint: NC-N_VP5
Auto-generated on behalf of Manager NEM Real Time Operations
75325NON-CONFORMANCE12/04/2020 04:15:16 AM
NON-CONFORMANCE Region NSW1 Sunday, 12 April 2020
AEMO ELECTRICITY MARKET NOTICE
NON-CONFORMANCE NSW1 Region Sunday, 12 April 2020
AEMO declared a schedule generating unit non-conforming
Unit: VP5
Duration: 12/04/2020 04:05 to 12/04/2020 04:15
Amount: 18 MW
Constraint: NC-N_VP5
Auto-generated on behalf of Manager NEM Real Time Operations
NON-CONFORMANCE NSW1 Region Sunday, 12 April 2020
AEMO declared a schedule generating unit non-conforming
Unit: VP5
Duration: 12/04/2020 04:05 to 12/04/2020 04:15
Amount: 18 MW
Constraint: NC-N_VP5
Auto-generated on behalf of Manager NEM Real Time Operations
75324INTER-REGIONAL TRANSFER12/04/2020 03:32:00 AM
Inter-regional transfer limit variation - Lismore SVC - NSW region - 12 April 2020
AEMO ELECTRICITY MARKET NOTICE
At 0322 hrs 12/04/2020 there was an unplanned outage of the Lismore SVC.
The following constraint set invoked at 0330 hrs
N-LS_VC1
This constraint set contains equations with the following interconnectors on the LHS.
N-Q-MNSP1
NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
At 0322 hrs 12/04/2020 there was an unplanned outage of the Lismore SVC.
The following constraint set invoked at 0330 hrs
N-LS_VC1
This constraint set contains equations with the following interconnectors on the LHS.
N-Q-MNSP1
NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
75323RECLASSIFY CONTINGENCY11/04/2020 03:44:51 PM
Cancellation of a Non-Credible Contingency Event: Hazelwood - Rowville No.1 220kV line and Hazelwood - Rowville No.2 220kV line in VIC1 due to Lightning.
AEMO ELECTRICITY MARKET NOTICE
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: VIC1
Lines: Hazelwood - Rowville No.1 220kV and Hazelwood - Rowville No.2 220kV
Cancellation time: 11/04/2020 15:44
Constraint set(s) revoked:
V-HWRO_R_N-2 Constraint set contains the following interconnector(s) on the left hand side:
NONE
Refer AEMO Electricity Market Notice 75305
Auto-generated on behalf of Manager NEM Real Time Operations
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: VIC1
Lines: Hazelwood - Rowville No.1 220kV and Hazelwood - Rowville No.2 220kV
Cancellation time: 11/04/2020 15:44
Constraint set(s) revoked:
V-HWRO_R_N-2 Constraint set contains the following interconnector(s) on the left hand side:
NONE
Refer AEMO Electricity Market Notice 75305
Auto-generated on behalf of Manager NEM Real Time Operations
75322MARKET INTERVENTION11/04/2020 04:54:47 PM
Direction - SA region - 11/04/2020
AEMO ELECTRICITY MARKET NOTICE.
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 11/04/2020.
Intervention pricing does not apply to this AEMO intervention event.
Manager NEM Real Time Operations
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 11/04/2020.
Intervention pricing does not apply to this AEMO intervention event.
Manager NEM Real Time Operations
75320MARKET INTERVENTION11/04/2020 03:34:06 PM
Cancellation - AEMO Intervention Event - Intervention dispatch intervals - Direction SA region - 10/04/2020
AEMO ELECTRICITY MARKET NOTICE
Refer Market Notice 75265
The AEMO Intervention Event and all associated directions are cancelled from 1530 hrs 11/04/2020.
Manager NEM Real Time Operation
Refer Market Notice 75265
The AEMO Intervention Event and all associated directions are cancelled from 1530 hrs 11/04/2020.
Manager NEM Real Time Operation
75318MARKET INTERVENTION11/04/2020 03:23:15 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 expected to be synchronised in SA from 0200 hrs to 1400 hrs 12/04/2020 in Pre-dispatch published at 1430 hrs 11/04/2020 are inadequate to maintain sufficient system strength in SA and hence a secure operating state.
AEMO currently estimates that, in the absence of sufficient market response by 1700 hrs 11/04/2020, 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 expected to be synchronised in SA from 0200 hrs to 1400 hrs 12/04/2020 in Pre-dispatch published at 1430 hrs 11/04/2020 are inadequate to maintain sufficient system strength in SA and hence a secure operating state.
AEMO currently estimates that, in the absence of sufficient market response by 1700 hrs 11/04/2020, 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