AEMO MARKET NOTICE

Updated generator combinations for SA system strength

AEMO is continuing to investigate system strength requirements in South Australia.

Through this work, AEMO has identified three additional generator combinations which meet minimum system strength requirements in South Australia.

These new combinations are:
LOW_11 - 1 x Torrens Island A units + all Pelican Point units
LOW_12 - 3 x Torrens Island A units + 1 x Torrens Island B units + 1 x Pelican Point GT/ST units
LOW_13 - 1 x Torrens Island A units + 3 x Torrens Island B units + Osborne GT/ST

The limit on non-synchronous generation in South Australia when only a minimum strength requirement is met has also now been increased from 1200 to 1295 MW for the new and existing combinations. The limit for higher levels of synchronous generation has also been increased from 1700 to 1870 - Heywood (Vic to SA) transfers.

For more information refer to the updated limits advice:
http://www.aemo.com.au/-/media/Files/Electricity/NEM/Security_and_Reliability/Congestion-Information/2017/Transfer-Limit-Advice---South-Australian-System-Strength.pdf

The advice also includes a guide as to which generator combinations are required to satisfy N-1 operational conditions.

The ID of the constraint equation which manages this limit has now changed from S_WIND_1200_AUTO to S_NIL_STRENGTH_1 and S_NIL_STRENGTH_2.

AEMO are continuing to investigate system strength requirements in South Australia. A further update to this advice is expected by late January 2018.

Ben Blake
AEMO 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: Chinchilla - Columboola No.7349 132 kV and Chinchilla - Columboola No.7350 132 kV

Duration: 08/12/2017 12:15 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: Tarong - Chinchilla No.7168 132 kV and Tarong - Chinchilla No.7168 132 kV

Duration: 08/12/2017 12:07 until further notice

Constraint set(s) invoked:
NONE

Auto-generated on behalf of Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE
Inter-Regional Transfer limit variation - Directlink control unavailable (NSW Region)
AEMO has been notified that the controls to vary Directlink output are unavailable until further notice.
The Constraint Set I-CTRL_ISSUE_TE was invoked from 1320 hrs
This Constraint Set contains equations with the following interconnector on the LHS.
N-Q-MNSP1

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

NON-CONFORMANCE VIC1 Region Wednesday, 6 December 2017

AEMO declared a schedule generating unit non-conforming

Unit: YWPS1
Duration: 06/12/2017 10:40 to 06/12/2017 11:05
Amount: -78 MW
Constraint: NC-V_YWPS1

Auto-generated on behalf of Manager NEM Real Time Operations

Market Notice

Change Number: CHG0046302

Notification issued to: Market Notice

Notification Type: Initial

Change Type: Normal

Service/ Component: Short Term Trading Market

Change Title: Planned System Outage on Gas Short Term Trading Market (STTM) : Site Transfer (NSW to QLD)

Change Start Date & Time: 14/12/2017 18:00:00 AEST

Change End Date & Time: 14/12/2017 21:30:00 AEST

Outage Start Date & Time: 14/12/2017 18:30:00 AEST

Outage End Date & Time: 14/12/2017 21:00:00 AEST

Change Description:

The Short Term Trading Market Production System is to be transferred to the alternate site to support STTM maintenance activities.

Environment: Production

Participant Impact and Requirements:

The following impacts are expected during this maintenance:
- The Gas Short Term Trading System will be unavailable for the duration of the outage.

Support Information:
Report any impacts to th

Market Notice

Change Number: CHG0046161

Notification issued to: Market Notice

Notification Type: Initial

Change Type: Normal

Service/ Component: EMMS - Data Interchange

Change Title: Planned System Maintenance - Electricity Market Management System (EMMS) - Pre-Production environment

Change Start Date & Time: 07/12/2017 11:00:00 AEST

Change End Date & Time: 13/12/2017 17:00:00 AEST

Outage Start Date & Time:

Outage End Date & Time:

Change Description:

The Wholesale Electricity Market Management System (EMMS) Pre-Production environment will undergo maintenance activities starting Thursday December 7th, 2017 and will finish Wednesday December 13th, 2017.

Environment: Pre-Production

Participant Impact and Requirements:

This activity will affect EMMS Pre-Production Participant FTP Services and Data Interchange, however periods of downtime will be minimal and we expect that participants will be able to use Pre-Production as per normal throughout.

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

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: VIC

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

Cancellation time: 2100hrs 5/12/2017
Constraint set(s) revoked: V-DDGN_N-2

Refer AEMO Electricity Market Notice 60240

Manager NEM Real Time Operations

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: NSW

Lines: Coffs Harbour - Raleigh No.9W3 and Coffs Harbour - Boambee South No.9W8 132kV lines

Cancellation time: 05/12/17 17:15
Constraint set(s) revoked: Nil

Refer AEMO Electricity Market Notice 60242

Manager NEM Real Time Operations