Market Notices

78133MARKET INTERVENTION22/09/2020 12:23:33 AM

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 0130 hrs 23/09/2020 to 1600 hrs 23/09/2020 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 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.

If necessary, AEMO will estimate and publish the latest time at which AEMO would need to intervene after the 1230 hrs predispatch run on the 22/09/2020.

Manager NEM Real Time Operations
     
78132RECLASSIFY CONTINGENCY22/09/2020 12:16:10 AM

Reclassification of a Non-Credible Contingency Event: Farrell - Reece No.1 220 kV line and Farrell - Reece No.2 220 kV 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: Farrell - Reece No.1 220 kV and Farrell - Reece No.2 220 kV

Duration: 22/09/2020 00:16 until further notice

Constraint set(s) invoked:
F-T-FARE_N-2 Constraint set contains the following interconnector(s) on the left hand side:
T-V-MNSP1


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78131RECLASSIFY CONTINGENCY21/09/2020 11:44:52 PM

Cancellation of a Non-Credible Contingency Event: Bayswater - Mt Piper No.5A3 500kV line and Wollar - Mt Piper No.5A5 500kV line in NSW1 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: NSW1

Lines: Bayswater - Mt Piper No.5A3 500kV and Wollar - Mt Piper No.5A5 500kV

Cancellation time: 21/09/2020 23:44

Constraint set(s) revoked:
NONE

Refer AEMO Electricity Market Notice 78129

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78130NON-CONFORMANCE21/09/2020 07:54:44 PM

NON-CONFORMANCE Region NSW1 Monday, 21 September 2020

AEMO ELECTRICITY MARKET NOTICE

NON-CONFORMANCE NSW1 Region Monday, 21 September 2020

AEMO declared a schedule generating unit non-conforming

Unit: SHGEN
Duration: 21/09/2020 19:35 to 21/09/2020 19:40
Amount: 51 MW
Constraint: NC-N_SHGEN

Manager NEM Real Time Operations
     
78129RECLASSIFY CONTINGENCY21/09/2020 07:41:25 PM

Reclassification of a Non-Credible Contingency Event: Bayswater - Mt Piper No.5A3 500kV line and Wollar - Mt Piper No.5A5 500kV line in NSW1 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: NSW1

Lines: Bayswater - Mt Piper No.5A3 500kV and Wollar - Mt Piper No.5A5 500kV

Duration: 21/09/2020 19:41 until further notice

Constraint set(s) invoked:
NONE

Auto-generated on behalf of Manager NEM Real Time Operations
     
78128NON-CONFORMANCE21/09/2020 07:15:17 PM

NON-CONFORMANCE Region NSW1 Monday, 21 September 2020

AEMO ELECTRICITY MARKET NOTICE

NON-CONFORMANCE NSW1 Region Monday, 21 September 2020

AEMO declared a schedule generating unit non-conforming

Unit: VP6
Duration: 21/09/2020 19:10 to 21/09/2020 19:15
Amount: 23 MW
Constraint: NC-N_VP6

Auto-generated on behalf of Manager NEM Real Time Operations
     
78127RECLASSIFY CONTINGENCY21/09/2020 05:53:42 PM

Reclassification of a Non-Credible Contingency Event: Brinkworth-Davenport, Brinkworth-Templers West and Para-Templers West 275kV lines in SA due to severe weather warning.

AEMO ELECTRICITY MARKET NOTICE.

Reclassification of a non-credible contingency event as a credible contingency event due to severe weather warning.

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: SA

Lines: Brinkworth-Davenport, Brinkworth-Templers West and Para-Templers West 275kV lines

Duration: 21/09/2020 17:50 until further notice
Constraint set(s) invoked: Nil

Manager NEM Real Time Operations
     
78126GENERAL NOTICE21/09/2020 05:07:03 PM

Cancellation - Non-credible contingency event more likely to occur due to existence of abnormal conditions - SA region

AEMO ELECTRICITY MARKET NOTICE.

Abnormal conditions advised in AEMO Electricity Market Notice 78083 have ceased to impact the likelihood of a non-credible event occurring as at 1710 hrs 21/09/2020.

Constraint set I-VS_250 revoked at 1710 hrs.

Manager NEM Real Time Operations
     
78125RECLASSIFY CONTINGENCY21/09/2020 04:54:50 PM

Cancellation of a Non-Credible Contingency Event: Farrell-John Butters line and Farrell-Rosebery-Newton-Queenstown line in TAS1 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: TAS1

Lines: Farrell-John Butters and Farrell-Rosebery-Newton-Queenstown

Cancellation time: 21/09/2020 16:54

Constraint set(s) revoked:
NONE

Refer AEMO Electricity Market Notice 78121

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