Market Notices

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: Goonyella - Nth Goonyella T- Stoney Creek 7122 132 kV and Goonyella - Newlands No. 7155 132 kV

Duration: 18/10/2019 19:46 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: QLD1

Lines: Moranbah - Goonyella No.7370 132 kV and Moranbah - Goonyella No.7369 132 kV

Duration: 18/10/2019 19:46 until further notice

Constraint set(s) invoked:
NONE

Auto-generated on behalf of Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Cancellation - AEMO Intervention Event - Intervention price dispatch intervals - Direction SA region 17/10/2019

Refer Market Notices 70577 and 70578

The AEMO Intervention Event and all associated directions are cancelled from 1700 hrs 18/10/2019


Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

AEMO Intervention Event - Intervention price dispatch intervals - 18/10/2019

Refer AEMO Electricity Market Notice no. 70591

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 1805 hrs dispatch interval and is forecast to apply until 1600 hrs 19/10/2019.

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 0835 hrs dispatch interval on 19/10/2019.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Direction - SA region 18/10/2019

In accordance with section 116 of the National Electricity Law, AEMO has issued a direction to a participant in the SA 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

Possible intervention to manage power system security in South Australia (SA) Region - 18/10/2019

The synchronous generating units expected to be synchronised in SA from 0830 hrs 19/10/2019 to 1600 hrs 19/10/2019 in Pre-dispatch published at 1530 hrs 18/10/2019 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 1800 hrs 18/10/2019, 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

The Moorabool - Tarrone 500 kV line in the Victoria (VIC) region is planned to be out of service from 0600 hrs to 1600 hrs on the following dates:

-04/11/2019
-05/11/2019
-06/11/2019

A credible contingency event during this planned outage could cause synchronous separation of the South Australia (SA) region from the rest of the NEM. If separation occurs, load may be interrupted due to the operation of the Automatic Under Frequency Load Shedding (AUFLS) scheme in SA.

The credible separation contingency is managed as follows:

- When power transfer is from SA to Victoria, contingency lower FCAS will be sourced from SA.
- When power transfer is from Victoria to SA, due to the 47-52Hz island separation frequency band advised by the SA jurisdiction, contingency raise FCAS is not sourced in SA and the AUFLS scheme may respond to low frequency events.
- Power transfer will be restricted on Victoria - South Australia interconnector (Heywood interconnector) to manage system security following the loss of the next contingency.

Forecast capacity reserves in the SA region are currently sufficient to meet electricity demand during the planned outage.

The following constraint sets have been invoked for this outage:
I-VS_050
S-X_BC_CP
V-MLTR

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

Mya San
AEMO Operations

Change Number: CHG0056337

Notification issued to: Market Notice

Notification Type: Initial

Change Type: Expedited

Service/ Component: Gas Full Retail Contestability

Change Title: Gas Full Retail Contestability - Maintenance activity

Change Start Date & Time: 20/10/2019 10:00:00 AEST

Change End Date & Time: 20/10/2019 14:00:00 AEST

Outage Start Date & Time:

Outage End Date & Time:

Change Description:

Gas Full Retail Contestability (GFRC) maintenance activities.

Environment: Production

Participant Impact and Requirements:

No impact expected. Please be aware of the change.

Support Information:
Report any impacts to the AEMO Information and Support Hub or on External 1300 236 600.

AEMO ELECTRICITY MARKET NOTICE

Inter-Regional Transfer limit variation Greenbank SVC Qld region - 18/10/2019

At 1124 hrs there was a short notice outage of the Greenbank SVC in the Queensland region.

Constraint set Q-GB_VC invoked from 1130 hrs until further notice.

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

NSW1-QLD1

N-Q-MNSP1

Refer to the AEMO Network Outage Scheduler (NOS) for further information.

Manager NEM Real Time Operations