Market Notices

79129SETTLEMENTS RESIDUE23/10/2020 04:05:18 PM

[EventId:202010231605_NRM_NSW1_VIC1_started] NEGRES CONSTRAINT NRM_NSW1_VIC1 started operating from 23 October 2020 16:05

AEMO ELECTRICITY MARKET NOTICE

Issued by Australian Energy Market Operator Ltd at 1605 hrs on 23 October 2020

ACTUAL NEGATIVE SETTLEMENT RESIDUES - NSW to VIC - 23 October 2020.

Electricity Market outcomes have resulted in the accumulation of negative settlement residues that have exceeded the allowable negative residue threshold for the NSW to VIC directional interconnector.

The negative residue constraint set NRM_NSW1_VIC1 commenced operating from 1605 hrs on 23 October 2020.

This constraint set contains an equation with the following interconnectors on the LHS:
VIC1-NSW1

The RHS of the constraint equation may be adjusted to manage residues.


This is an AEMO autogenerated Market Notice.
     
79128RECLASSIFY CONTINGENCY23/10/2020 04:01:03 PM

Reclassification of a Non-Credible Contingency Event: Bulli Creek - Dumaresq 8L 330KV line and Bulli Creek - Dumaresq 8M 330KV line in QLD1 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: QLD1

Lines: Bulli Creek - Dumaresq 8L 330KV and Bulli Creek - Dumaresq 8M 330KV

Duration: 23/10/2020 16:00 until further notice

Constraint set(s) invoked:
I-QNI_ONE_PHASE_N-2 Constraint set contains the following interconnector(s) on the left hand side:
NSW1-QLD1


Auto-generated on behalf of Manager NEM Real Time Operations
     
79127INTER-REGIONAL TRANSFER23/10/2020 03:17:30 PM

Inter-regional transfer limit variation - Davenport - Bungama 275 kV Line - SA region - 23/10/2020

AEMO ELECTRICITY MARKET NOTICE

Inter-regional transfer limit variation - Davenport - Bungama 275 kV Line - SA region - 23/10/2020

Refer AEMO Electricity Market Notice 79126

At 1442 hrs there was an unplanned outage of the Davenport - Bungama 275 kV Line.

The following constraint set invoked at 1500 hrs

S-BGDV

This constraint set(s) contains equations with the following interconnectors on the LHS.

V-S-MNSP1


Refer to the AEMO Network Outage Scheduler for further information.

Manager NEM Real Time Operations

     
79126POWER SYSTEM EVENTS23/10/2020 03:07:49 PM

Non-credible contingency event - SA region - 23/10/2020

AEMO ELECTRICITY MARKET NOTICE.

Non-credible contingency event - SA region - 23/10/2020

At 1442 hrs the Davenport - Bungama 275 kV Line and the East 275 kV Busbar at Davenport 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


     
79125RECLASSIFY CONTINGENCY23/10/2020 01:59:05 PM

Reclassification of a Non-Credible Contingency Event: Tarong - Chinchilla No.7168 132 kV line and Tarong - Chinchilla No.7183 132 kV line in QLD1 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: QLD1

Lines: Tarong - Chinchilla No.7168 132 kV and Tarong - Chinchilla No.7183 132 kV

Duration: 23/10/2020 13:59 until further notice

Constraint set(s) invoked:
NONE

Auto-generated on behalf of Manager NEM Real Time Operations
     
79124MARKET INTERVENTION23/10/2020 01:48:11 PM

Update - Possible intervention to manage power system security in South Australia (SA) Region

AEMO ELECTRICITY MARKET NOTICE

Update - Possible intervention to manage power system security in South Australia (SA) Region

Refer AEM0 Electricity Market Notice 79070

The synchronous generating units expected to be synchronised in SA from 2030 hrs 23/10/2020 to1330 hrs 26/10/2020 in Pre-dispatch published at 1330 hrs 23/10/2020 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 23/10/2020, 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







     
79123RECLASSIFY CONTINGENCY23/10/2020 01:21:50 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: 23/10/2020 13:21 until further notice

Constraint set(s) invoked:
NONE

Auto-generated on behalf of Manager NEM Real Time Operations
     
79122RECLASSIFY CONTINGENCY23/10/2020 12:57:12 PM

Reclassification of a Non-Credible Contingency Event: Dederang - Glenrowan No. 1 and No. 3 220kV lines and Numurkah Solar Farm in Vic 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: VIC

Lines: Dederang - Glenrowan No. 1 and No. 3 220kV lines and Numurkah Solar Farm

Duration: 1255 hrs 23/10/2020 until further notice

Constraint set(s) invoked: V-NIL_DDGN_NSF_N-2

Interconnectors on LHS of related constraint sets: V-S-MNSP1, VIC1-NSW1

Manager NEM Real Time Operations
     
79121PRICES UNCHANGED23/10/2020 12:47:22 PM

[EventId:202010231225_confirmed] Prices for interval 23-Oct-2020 12:25 are now confirmed

AEMO ELECTRICITY MARKET NOTICE

Issued by Australian Energy Market Operator Ltd at 1245 hrs on 23 October 2020

PRICES ARE NOW CONFIRMED for dispatch interval 23-Oct-2020 12:25.

In accordance with Market Notice 79111 AEMO has reviewed this dispatch interval and determined that:
- Manifestly Incorrect Inputs did not apply

Prices remain unchanged.


This is an AEMO autogenerated Market Notice.
     
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