AEMO ELECTRICITY MARKET NOTICE

NON-CONFORMANCE QLD1 Region Tuesday, 17 July 2018

AEMO declared a schedule generating unit non-conforming

Unit: DDPS1
Duration: 17/07/2018 15:00 to 17/07/2018 15:05
Amount: -20 MW
Constraint: NC-Q_DDPS1

Auto-generated on behalf of Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

The synchronous generating units expected to be synchronised in SA from 0100 hrs 18/07/2018 to 1500 hrs 18/07/2018 in Pre-dispatch published at 1430 hrs 17/07/2018 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 17/07/2018, 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 18/07/2018 to 1500 hrs 18/07/2018, to maintain power system security in SA.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

The MTPASA result published on 17 July 2018 identifies no Low Reserve Conditions over the next 2 years.

Please note that MTPASA informs the market of potential reliability issues to allow the market to respond in the first instance, potentially avoiding the need for any market intervention or direction from AEMO.

For further information, please refer to:
https://www.aemo.com.au/Electricity/National-Electricity-Market-NEM/Data/Market-Management-System-MMS/Projected-Assessment-of-System-Adequacy

This notice supersedes Market Notice 63429 published on 10 July 2018.

Background
As part of a broader process of implementing the reliability standard, AEMO runs the Medium Term Projected Assessment of System Adequacy (MTPASA) process weekly to forecast expected unserved energy levels over a two year period. If the expected annual unserved energy exceeds the maximum level specified by the Reliability Standard, a Low Reserve Condition is identified.

For more information about how AEMO implements the reliability standard, please view the Reliability Standard Implementation Guidelines (RSIG) available on AEMO's website at
http://www.aemo.com.au/-/media/Files/Stakeholder_Consultation/Consultations/Electricity_Consultations/2016/EAAP/Reliability-Standard-Implementation-Guidelines.pdf

Forecasting
AEMO

AEMO ELECTRICITY MARKET NOTICE

Refer Market Notices 63482, 63483, 63485 and 63486

The AEMO Intervention Event and all associated directions are cancelled from 0630 hrs 17/07/2018.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Inter-regional transfer limit variation -Terranora Interrconnector

At 0413 an unplanned outage of one cable of Directlink occurred
The following constraint set was invoked at 0420 hrs until further notice.
N-X-MBTE_1

This Constraint Set contains an equation with the following interconnector on the LHS.
N-Q-MNSP1

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

Manager NEM Real Time Operations

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: 0150 hrs 17/07/2018 until further notice

Constraint set(s) invoked: Nil

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to severe weather warning for damaging winds. 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: Para -Templers West and the Magill - Torrens Island A 275 kV lines

Duration: 0150 hrs 17/07/2018 until further notice

Constraint set(s) invoked: Nil

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Refer AEMO Electricity Market Notice no. 63485

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 and is forecast to apply until 0630 hrs 17/07/2018.

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 2235 hrs dispatch interval on 16/07/2018.


Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

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