Market Notices

AEMO ELECTRICITY MARKET NOTICE

Refer Market Notice 75485

The AEMO Intervention Event and all associated directions are cancelled from 1530 hrs 29/04/2020.

Manager NEM Real Time Operation

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: 29/04/2020 14:47 until further notice

Constraint set(s) invoked:
NONE

Auto-generated on behalf of Manager NEM Real Time Operations

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: Dederang - Glenrowan No.1 220 kV and Dederang - Glenrowan No.3 220 kV

Duration: 29/04/2020 14:24 until further notice

Constraint set(s) invoked:
V-DDGN_N-2 Constraint set contains the following interconnector(s) on the left hand side:
V-S-MNSP1
VIC1-NSW1


Auto-generated on behalf of Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Direction - SA region - 29/04/2020

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 1405 hrs on 29/04/2020.

Intervention pricing does not apply to this AEMO intervention event.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

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

Refer AEMO Electricity MN 75493

The synchronous generating units expected to be synchronised in SA from 0100 hrs 30/04/2020 to 0400 hrs 01/05/2020 in Pre-dispatch published at 1300 hrs 29/04/2020 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 1400 hrs 29/04/2020, 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

AEMO ELECTRICITY MARKET NOTICE

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

The combination of synchronous generating units currently expected to be synchronised in SA from 0100 hrs 30/04/2020 in Pre-dispatch will not provide sufficient system strength in SA to maintain the power system in a secure operating state.
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 from 0100 hrs 30/04/2020 to maintain power system security in SA. Refer to current Transfer Limit Advice for SA system strength on AEMOs website.
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 29/04/2020.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Inter-Regional Transfer limit variation - Directlink - NSW Region

There has been an unplanned outage of the No 3 Leg of Directlink .

The following constraint set was invoked at 1840 hrs 28/04/2020.

N-X_MBTE_2

The constraint set contains the following interconnector on the left hand side.

N-Q-MNSP1

Refer AEMO Network Outage Scheduler (NOS) for further details.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Cancellation -Inter-Regional Transfer Limit Variation - Manage Power System Security in the Vic and NSW Regions - 28/04/2020

Refer to AEMO Electricity Market Notice 75489

In order to maintain the power system in a secure operating state and manage post contingency voltage violations in the Victoria and New South Wales regions, AEMO invoked a discretionary constraint to limit the power transfer Vic to NSW.
.
Constraint set I-VN_1000 was invoked from 1050 hrs until 1500 hrs.

This Constraint Set contains equations with the following interconnector on the LHS;

VIC1-NSW1


Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Inter-Regional Transfer Limit Variation - Manage Power System Security in the Vic and NSW Regions - 28/04/2020

In order to maintain the power system in a secure operating state and manage post contingency voltage violations in the Victoria and New South Wales regions, AEMO has invoked a discretionary constraint to limit the power transfer Vic to NSW.
.
Constraint set I-VN_1000 has been invoked from 1050 hrs until further advice


This Constraint Set contains equations with the following interconnector on the LHS;

VIC1-NSW1


Manager NEM Real Time Operations