AEMO ELECTRICITY MARKET NOTICE

Update 2 - STPASA - Forecast Lack Of Reserve Level 1 (LOR1) in the South Australia Region on 31/05/2018

Refer AEMO Electricity Market Notice 62944, 62951

AEMO declares a Forecast LOR1 condition under clause 4.8.4(b) of the National Electricity Rules for the SA region for the following periods:

1. From 0830 hrs to 0900 hrs 31/05/2018.
The forecast capacity reserve requirement is 455 MW.
The minimum capacity reserve available is 413 MW.

2. From 1800 hrs to 1930 hrs 31/05/2018.
The forecast capacity reserve requirement is 455 MW.
The minimum capacity reserve available is 435 MW.

3. From 2000 hrs to 2100 hrs 31/06/2018 .
The forecast capacity reserve requirement is 455 MW.
The minimum capacity reserve available is 396 MW.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

AEMO Intervention Event - Intervention price dispatch intervals - 27/05/2018

Refer AEMO Electricity Market Notice no. 62959.

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 1505 hrs dispatch interval and is forecast to apply until 1100 hrs 29/05/2018.

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 0035 hrs dispatch interval on 28/05/2018.


Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Direction - SA region 27/05/2018

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

Cancellation - AEMO Intervention Event - Intervention price dispatch intervals - Direction SA region 25/05/2018

Refer Market Notices 62943 and 62948.

The AEMO Intervention Event and all associated directions are cancelled from 1400 hrs 27/05/2018.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

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

The synchronous generating units expected to be synchronised in SA from 0030 hrs 28/05/2018 in Pre-dispatch published at 1130 hrs 27/05/2018 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 1800 hrs 27/05/2018, AEMO may need to intervene by issuing a direction requiring one or more SA synchronous generating unit(s) to operate or remain synchronised from 0030 hrs 28/05/2018, to maintain power system security in SA.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Cancellation of reclassification of the simultaneous loss of Pelican Point GT 12 with any other generating unit as a credible contingency event.

Region: SA1

Cancellation time: 1115 hrs 27/05/2018

Constraint set(s) revoked:
S-NIL_MAXG_PP_N-2
F-I_NIL_PP_MG_N-2

Refer AEMO Electricity Market Notices 62447 and 62916.


Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Update - Non-credible contingency event -QLD region -26/05/2018

Update to MN 62950.

At 0934 hrs at the H35 Strathmore substation the No.1 and No.2 132 kV Buses tripped out of service.

The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.

Therefore AEMO has cancelled this event as being a credible contingency event from 1925 Hrs 26/05/2018

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Update - STPASA - Forecast Lack Of Reserve Level 1 (LOR1) in the South Australia Region beginning on 31/05/2018

Refer AEMO Electricity Market Notice 62944

AEMO declares a Forecast LOR1 condition under clause 4.8.4(b) of the National Electricity Rules for the SA region for the following periods:

1. From 0830 hrs to 0900 hrs 31/05/2018.
The forecast capacity reserve requirement is 455 MW.
The minimum capacity reserve available is 440 MW.

2. From 1730 hrs to 2300 hrs 31/05/2018.
The forecast capacity reserve requirement is 455 MW.
The minimum capacity reserve available is 235 MW.

3. From 2330 hrs 31/06/2018 to 0100 hrs 01/06/2018.
The forecast capacity reserve requirement is 455 MW.
The minimum capacity reserve available is 319 MW.

4. From 0800 hrs to 0930 hrs 01/06/2018.
The forecast capacity reserve requirement is 455 MW.
The minimum capacity reserve available is 390 MW.

5. From 1630 hrs to 1730 hrs 01/06/2018.
The forecast capacity reserve requirement is 445 MW.
The minimum capacity reserve available is 235 MW.


Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Non-credible contingency event -QLD region -26/05/2018

At 0934 hrs at the H35 Strathmore substation the No.1 and No.2 132 kV Buses tripped.

AEMO did not instruct load shedding. AEMO has not been advised of any loss of load.

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 therefore classifies this event as being a credible contingency event.


Manager NEM Real Time Operations