Market Notices

Reclassification of a Non-Credible Contingency Event: Brinkworth-Davenport, Brinkworth-Templers West and Para-Templers West 275kV lines in SA due to severe weather warning.


AEMO ELECTRICITY MARKET NOTICE.

Reclassification of a non-credible contingency event as a credible contingency event due to severe weather warning.

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: SA

Lines: Brinkworth-Davenport, Brinkworth-Templers West and Para-Templers West 275kV lines

Duration: 1840 hrs 24/10/2019 until further notice

Constraint set(s) invoked: Nil

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 70656

The synchronous generating units expected to be synchronised in SA from 0100 hrs 25/10/2019 to 1730 hrs 25/10/2019 in Pre-dispatch published at 1530 hrs 24/10/2019 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 0000 hrs 25/10/2019, 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

Dear Users,

Please be aware of Incident and its status mentioned below:

Services Affected:
API Interfaces unavailable for Electricity - Wholesale, Gas Bulletin Board, Gas Supply Hub and Generator Recall.



Time of Occurrence of Incident
24/10/2019 14:38:16 AEST

Impact/Status/Requirements

All,

Between 11:30 to 13:15 AEDT a number of AEMO's API's failed returning a 500 error.

This potentially impacted :

- Electricity - Wholesale:
- Semi-scheduled generating unit self forecasts
- Generator Recall
- Gas Bulletin Board:
- Gas Bulletin Board Report API endpoints.
- Gas Bulletin Board Submission API endpoints.
- Gas Supply Hub:
- Gas Supply Hub Pipeline Capacity Trading API endpoints
- Gas Supply Hub Capacity Auction Bidding API endpoints

AEMO has identified the root cause to this issue and have taken steps to resolve the issue.

If you have encountered a 500 return error during this time period, please resubmit.

If you are still encountering an issue please contact AEMO Support Hub.

References
Incident Number: INC0048391

For further details please contact the AEMO Information and Support Hub or on External 1300 236 600.

AEMO ELECTRICITY MARKET NOTICE.

AEMO Intervention Event - Intervention price dispatch intervals - 24/10/2019

Refer AEMO Electricity Market Notice 70659

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 0005 hrs dispatch interval and is forecast to apply until 1730 hrs 25/10/2019.

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 0105 hrs dispatch interval on 25/10/2019.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Direction - SA region 24/10/2019

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

Change Number: CHG0056300

Notification issued to: Market Notice

Notification Type: Initial

Change Type: Normal

Service/ Component: Electricity Market Management System

Change Title: Planned System Maintenance - Electricity MMS Production Bay Transfer

Change Start Date & Time: 29/10/2019 12:00:00 AEST

Change End Date & Time: 29/10/2019 15:00:00 AEST

Outage Start Date & Time:

Outage End Date & Time:

Change Description:

Maintenance is performed on the EMMS Production to support to allow maintenance work on the active site.

Environment: Production

Participant Impact and Requirements:

The transfer is not expected to have any impact on the production environment, however please be reminded that this activity is not without risk and therefore if any issue is identified after the transfer it should be reported to AEMO.

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

AEMO ELECTRICITY MARKET NOTICE

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

Refer AEMO Electricity Market Notice 70655

The synchronous generating units expected to be synchronised in SA from 0100 hrs 25/10/2019 to 1730 hrs 25/10/2019 in Pre-dispatch published at 1400 hrs 24/10/2019 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 1700 hrs 24/10/2019, 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

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

Refer AEMO Electricity Market Notice 70653

The synchronous generating units expected to be synchronised in SA from 0730 hrs 25/10/2019 to 1730 hrs 25/10/2019 in Pre-dispatch published at 1330 hrs 24/10/2019 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 1700 hrs 24/10/2019, 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

For Moorabool (MLTS) - Tarrone (TRTS) 500 kV line outage: refer to AEMO Electricity Market Notice 70009.

For this outage please note change to the start time of the MLTS - TRTS line outage as follows:
- on 29/10, 30/10 and 31/10/2019 - planned to start at 0530 hrs (previous 0700 hrs)

In addition, please note scheduled planned outage of the Heywood (HYTS) No.1 500 kV Bus as follows:
- on 29/10, 30/10 and 31/10/2019 - planned to be out of service from 0500 hrs to 1830 hrs.
This bus outage offload Heywood M1 500/275 kV transformer and MLTS - TRTS line

A credible contingency event during these planned outages 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 VIC, contingency lower FCAS will be sourced from SA.
- When power transfer is from VIC to SA, due to the 47-52 Hz 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 sufficiently low on VIC - SA 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.

Please note the following constraint set are invoked for these outages:
F-I-HYSE, I-VS_050, S-X_BC_CP, V-HYTX_M12, V-HY_500BUS, V-MLTR.

Please refer to AEMO Network Outage Scheduler (NOS) for further details.

Mya San
AEMO Operations