Market Notices

125565RECLASSIFY CONTINGENCY12/03/2025 02:49:16 PM

Cancellation of the reclassification of a Non-Credible Contingency Event: Farrell - Reece No. 1 and No. 2 220kV lines in TAS due to lightning.

AEMO ELECTRICITY MARKET NOTICE.

Cancellation of the 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: TAS

Lines: Farrell - Reece No. 1 and No. 2 220kV lines

Cancellation time: 12/03/2025 14:50
Constraint set(s) revoked: T-GH_RC12_250
F-T-FARE_N-2

Constraint set contains the following interconnector(s) on the left hand side:
T-V-MNSP1

Refer AEMO Electricity Market Notice 125545

Manager NEM Real Time Operations
     
125564POWER SYSTEM EVENTS12/03/2025 02:33:32 PM

Non-credible contingency event - TAS region - 12/03/2025

AEMO ELECTRICITY MARKET NOTICE.

Non-credible contingency event - TAS region - 12/03/2025

At 1303 hrs the Ulverstone - Emu Bay 110kV Line and the Ulverstone - Sheffield tee Paloona 110kV Line tripped and auto reclosed.

AEMO did not instruct load shedding.

Approximately 12MW of bulk electrical load was disconnected momentarily.

The cause of this non credible contingency event is not known at this stage.


Manager NEM Real Time Operations
     
125563RECLASSIFY CONTINGENCY12/03/2025 02:14:20 PM

Reclassification of a Non-Credible Contingency Event: Yallourn - Rowville 7 220 kV line and Yallourn - Rowville 8 220 kV line in VIC1 due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

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: VIC1

Lines: Yallourn - Rowville 7 220 kV and Yallourn - Rowville 8 220 kV

Duration: 12/03/2025 14:14 until further notice

Constraint set(s) invoked:
V-ROYP78_R_N-2 Constraint set contains the following interconnector(s) on the left hand side:
NONE


Auto-generated on behalf of Manager NEM Real Time Operations
     
125562RECLASSIFY CONTINGENCY12/03/2025 02:14:15 PM

Reclassification of a Non-Credible Contingency Event: Eildon PS - Mt Beauty No.1 220 kV line and Eildon PS - Mt Beauty No.2 220 kV line in VIC1 due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

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: VIC1

Lines: Eildon PS - Mt Beauty No.1 220 kV and Eildon PS - Mt Beauty No.2 220 kV

Duration: 12/03/2025 14:14 until further notice

Constraint set(s) invoked:
NONE

Auto-generated on behalf of Manager NEM Real Time Operations
     
125561POWER SYSTEM EVENTS12/03/2025 02:12:35 PM

Update - Non-credible contingency event - TAS region - 12/03/2025

AEMO ELECTRICITY MARKET NOTICE.

Update - Non-credible contingency event - TAS region - 12/03/2025

Refer AEMO Electricity Market Notice 125555

Updated elements: Sheffield George Town No. 1 220kV Line, Sheffield George Town No. 2 220kV Line plus 40 MW load loss at Nystar and 56 MW load loss at Temco.

Manager NEM Real Time Operations
     
125559RECLASSIFY CONTINGENCY12/03/2025 01:53:15 PM

Reclassification of a Non-Credible Contingency Event: Lindisfarne - Mornington No.1 TEE line and Lindisfarne - Mornington No.2 TEE line in TAS1 due to Lightning.

AEMO ELECTRICITY MARKET NOTICE

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: TAS1

Lines: Lindisfarne - Mornington No.1 TEE and Lindisfarne - Mornington No.2 TEE

Duration: 12/03/2025 13:53 until further notice

Constraint set(s) invoked:
NONE

Auto-generated on behalf of Manager NEM Real Time Operations
     
125556POWER SYSTEM EVENTS12/03/2025 01:24:46 PM

Non-credible contingency event - TAS region - 12/03/2025

AEMO ELECTRICITY MARKET NOTICE.

Non-credible contingency event - TAS region - 12/03/2025

At 1200 hrs the Sheffield - Burnie No. 1 220kV Line, Sheffield - Burnie 2 110kV Line and the Ulverstone - Emu Bay 110kV Line tripped.

AEMO did not instruct load shedding.

AEMO has been advised that 43MW of bulk electrical load has been disconnected.

The cause of this non credible contingency event is not known at this stage.


Manager NEM Real Time Operations
     
125555POWER SYSTEM EVENTS12/03/2025 12:58:00 PM

Update - Non-credible contingency event - TAS region - 12/03/2025

AEMO ELECTRICITY MARKET NOTICE.

Update - Non-credible contingency event - TAS region - 12/03/2025

Refer AEMO Electricity Market Notice 125554

The cause of this non credible contingency event is not known at this stage.
AEMO is not satisfied that this non credible event is unlikely to re-occur.
AEMO has therefore reclassified this event as a credible contingency event until further notice.

Region: TAS

Elements: Sheffield George Town No. 1 220kV Line and Sheffield George Town No. 2 220kV Line
Duration: 1300 hrs 12/03/2025 until further notice
Constraint set(s) invoked: T-GTSH_N-2

Manager NEM Real Time Operations
     
125554POWER SYSTEM EVENTS12/03/2025 12:24:04 PM

Non-credible contingency event - TAS region - 12/03/2025

AEMO ELECTRICITY MARKET NOTICE.

Non-credible contingency event - TAS region - 12/03/2025

At 1158 hrs the Sheffield George Town No. 1 220kV Line and the Sheffield George Town No. 2 220kV Line 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
     
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