AEMO ELECTRICITY MARKET NOTICE

The synchronous generating units expected to be synchronised in SA from 0030 hrs 23/07/2019 to 0700 hrs 23/07/2019 in Pre-dispatch published at 2230 hrs 21/07/2019 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.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

AEMO Intervention Event - Intervention price dispatch intervals - 21/07/2019

Refer AEMO Electricity Market Notice no. 69061

An AEMO Intervention Event occurred when AEMO issued a direction to maintain the power system in a secure operating state.

The AEMO Intervention Event commenced in the 1635 hrs dispatch interval 21/09/2019 and is forecast to apply until 1530 hrs 22/07/2019.

AEMO declares all dispatch intervals during the AEMO Intervention Event to be intervention price dispatch intervals.

The direction is expected to affect dispatch quantities for intervention pricing purposes from the 0035 hrs dispatch interval on 22/07/2019.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Direction - South Australia region 21/07/2019

In accordance with section 116 of the National Electricity Law, AEMO has issued a direction to a participant in the South Australia region.

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.

For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a).

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event.

Refer to AEMO Electricity Market Notice No 69058

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: Qld

Elements: Darling Downs PS to R2 Braemar 8862 275 kV Line and Darling Downs Generator GT 3.


Duration: 1550 hrs 21/07/2019 until further notice

Constraint set(s) invoked: Nil


Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Update - Non-credible contingency event - Qld region - 21/07/2019

Refer to AEMO Electricity Market Notice No 69057

At 1400 hrs the Darling Downs PS to R2 Braemar 8862 275 kV Line and Darling Downs Generator GT 3 tripped.

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.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Non-credible contingency event - Qld region - 21/07/2019

At 1400 hrs the Darling Downs PS to R2 Braemar 8862 275 kV Line and Darling Downs Generator GT 3 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

AEMO ELECTRICITY MARKET NOTICE

Cancellation - AEMO Intervention Event - Intervention price dispatch intervals - Direction South Australia region - 19/07/2019

Refer Electricity Market Notices 69024 and 69048

The AEMO Intervention Event and associated direction are cancelled from 1430 hrs 21/07/2019.

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 Market Notice 69052

The synchronous generating units expected to be synchronised in SA from 0030hrs 22/07/2019 to 1530 hrs 22/07/2019 in Pre-dispatch published at 1330 hrs 21/07/2019 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 1630 hrs 21/07/2019 AEMO may need to intervene by issuing a direction requiring one or more SA synchronous generating unit(s) to synchronise or remain synchronised to maintain power system security in SA.

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 Market Notice 69050

The synchronous generating units expected to be synchronised in SA from 0100hrs 22/07/2019 to 1530 hrs 22/07/2019 in Pre-dispatch published at 1030 hrs 21/07/2019 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 1630 hrs 21/07/2019 AEMO may need to intervene by issuing a direction requiring one or more SA synchronous generating unit(s) to synchronise or remain synchronised to maintain power system security in SA.

Manager NEM Real Time Operations