Power system operating incident reports
AEMO conducts investigations of 'unusual power system events' within the NEM.
These events are known as "reviewable operating incidents" and are generally not considered as "credible contingency events". As such, these events are not normally taken into account in the operation of the NEM.
The full scope of such events is set out in National Electricity Rules Clause 4.8.15, the guidelines established by the Reliability Panel and the agreed list of Critical Transmission Elements.
AEMO conducts these investigations to assess the adequacy of the provision and response of facilities or services, and the subsequent appropriateness of actions taken to restore or maintain power system security. AEMO then publishes a report on each incident.
Archived reports are available from AEMO's Support Hub.
Power System Incident Reports 2021
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29/11/2021
Eraring 500 kV Main Busbar Trip
Date of incident: 31 August 2021
252.68 KB -
02/12/2021
5A3 line and Bayswater Unit 4 Trip
Date of incident: 10 August 2021
320.8 KB -
08/12/2021
Trip of Multiple Cherry Gardens Lines
Date of incident: 16 July 2021
294.76 KB -
30/09/2021
Trip of Muswellbrook-Tamworth 88 330 kV line
Date of incident: 13 July 2021
228.67 KB -
21/10/2021
Trip of Armidale-Sapphire 8E 330 kv line
Date of incident: 5 July 2021
225.95 KB -
10/09/2021
Trip of Heywood - South East No. 1 Line M1 Transformer 275 kV Circuit Breaker
Date of incident: 2 June 2021
231.74 KB -
15/10/2021
Final Report - Trip of multiple generators and lines in Qld and associated under-frequency load shedding
Date of incident: 25 May 2021
10.53 MB -
02/06/2021
Preliminary Report - Trip of multiple generators and lines in Qld and associated under-frequency load shedding
Date of incident : 25 May 2021
2.07 MB -
04/10/2021
Trip of Springvale No2 220kV Bus
Date of incident: 22 May 2021
238.15 KB -
11/11/2021
Newport 220 kV Bus 1 and Fishermans Bend 220/66kV Transformer B2 Trip
Date of incident: 14 May 2021
329.73 KB -
03/09/2021
Trip of Burnie No. 2 Transformer
Date of incident: 12 May 2021
373.37 KB -
30/09/2021
Trip of the Wodonga Terminal Station No.1 and No. 2 330kV transformers
Date of incident: 3 May 2021
272.11 KB -
14/07/2021
Raglan 275 kV No.2 Busbar trip
Date of incident: 13 April 2021
232.68 KB -
01/09/2021
Trip of the FA-JB and FA-RB-NT-QT lines
Date of incident: 10 April 2021
424.37 KB -
13/09/2021
Trip and reclose of Mount Beauty to Dederang 220 kV Lines
Date of incident: 29 March 2021
241.92 KB -
07/07/2021
Western Downs 275 kV No. 2 Busbar Trip
Date of incident: 22 March 2021
352.31 KB -
25/11/2021
Maintaining operational demand in South Australia
Date of incident: 14 March 2021
498.67 KB
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23/11/2021
Final Report - Torrens Island 275 kV West busbar trip
Date of incident : 12 March 2021
632.15 KB -
19/03/2021
Preliminary Report - Torrens Island 275 kV West busbar trip
Date of incident : 12 March 2021
303.48 KB -
28/07/2021
Trip of Mount England to Wivenhoe Power Station 275 kV Line and South Pine Static Var Compensator
Date of incident: 22 February 2021
403.33 KB -
24/06/2021
Trip of Multiple Cherry Gardens lines
Date of incident: 24 January 2021
1.08 MB -
16/02/2021
Preliminary Report - Total Loss of NEM SCADA Data
Date of incident : 24 January 2021
354.47 KB -
27/09/2021
Final Report - Total Loss of NEM SCADA data
Date of incident: 24 January 2021
497.24 KB
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Power System Incident Reports 2020
Power System Incident Reports 2020
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21/04/2021
Trip of Wandoan South - Yuleba North 8899 and 8898 275 kV lines
Date of incident: 7 December 2020
253.57 KB -
06/04/2021
Trip of the Wodonga Terminal Station No.1 and No.2 330 kV transformers
Date of incident: 23 November 2020
289.86 KB -
17/06/2021
Trip of New Osborne 66 kV Busbar
Date of incident: 11 November 2020
351.58 KB -
21/04/2021
Tasmania - Trip of both Gordon – Chapel Street 220kV lines and unexpected operations of AUFLS
Dates of incident: 31 October 2020 and 8 December 2020
549.01 KB -
23/02/2021
Trip of Newport D power station No 2 220 kV busbar
Date of incident : 27 October 2020
309.43 KB -
25/02/2021
Incident report involving the trip of Davenport-Bungama 275 kV line and Davenport East 275 kV busfina
Date of incident: 23 October 2020
314.22 KB -
10/02/2021
275kV CT failure at Brinkworth substation
Date of incident : 16 October 2020
308.06 KB -
05/01/2021
Trip of Mount England - Wivenhoe 823 & 824 275kV lines
Date of incident: 30 September 2020
318.35 KB -
14/07/2021
Cherry Gardens - Tailem Bend 275 kV line and Mobilong - Tailem Bend 132 kV line trip
Date of Incident: 20 September 2021
240.22 KB -
24/02/2021
Trip of No.1 and No. 2 Wodonga 330 kV transformers
Date of incident: 8 September 2020
284.09 KB -
25/03/2021
Trip of Ararat - Crowlands line and Wemen Solar Farm
Date of incident: 20 August 2020
338.34 KB -
03/12/2021
Trip of Vales Point Unit 5 and Unit 6
Date of incident: 7 June 2020
233.95 KB -
21/01/2021
Trip of Yallourn generating units 1, 3 and 4 Macarthur Wind Farm collector groups
Date of incident: 11 April 2020
557.9 KB -
18/06/2020
Single phase trip/reclose of Calvale-Stanwell 8873 and 8874 275kV lines
Date of incident: 26 February 2020
240.4 KB -
12/08/2020
Trip of 5A3 and 5A5 lines
Date of incident: 17 February 2020
289.29 KB -
13/08/2020
Trip of Liddell Unit 1 and 83 line
Date of incident: 7 February 2020
322.31 KB -
01/09/2020
Trip of Munmorah Main 330kV Busbar
Date of incident: 1 February 2020
239.15 KB -
05/11/2021
Final Report - Victoria and South Australia Separation Event
Date of incident: 31 January 2020
1.78 MB -
17/04/2020
Preliminary Report - Victoria and South Australia Separation Event
Date of incident: 31 January 2020
565.07 KB -
03/07/2020
Trip of Kemps Creek A 330 kV Busbar
Date of incident: 27 January 2020
310.89 KB -
25/09/2020
Trip of Ross - Chalumbin 857 and 858 feeders
Date of incident: 25 Jan 2020
393.03 KB -
18/09/2020
Trip of Lismore – Mullumbimby tee Dunoon 9U6 and 9U7 132 kV lines
Date of incident: 25 January 2020
251.36 KB -
15/07/2020
Torrens Island Power Station A 275 kV West bus
Date of incident: 20 January 2020
401.29 KB -
18/06/2020
Chapel Street Liapootah 2 220kV line and Chapel Street 220kV CB S752 trip
Date of incident: 16 January 2020
255.59 KB -
02/12/2020
Trip of Eildon – Mount Beauty No.1 and No.2 220 kV lines
Date of incident: 10 January 2020
449.21 KB -
05/06/2020
Trip and reclose Munmorah - Tuggerah 2M and Munmorah - Sydney West 26 330kV lines
Date of incident: 9 January 2020
242.75 KB -
15/07/2020
Trip of the Vales Point Generator 330 kV and No. 1 Transformer
Date of incident: 6 January 2020
511.18 KB -
25/09/2020
Final Report - New South Wales and Victoria Separation Event
Date of incident: 4 January 2020
1.21 MB -
05/03/2020
Preliminary Report - New South Wales and Victoria Separation Event
Date of incident: 4 January 2020
856.72 KB
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Power System Incident Reports 2019
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Power System Incident Reports 2018
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Power System Incident Reports 2017
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Power System Incident Reports 2016
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Power System Incident Reports 2015
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Power System Incident Reports 2014
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Power System Incident Reports 2013
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Power System Incident Reports 2012
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Power System Incident Reports 2011
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Power System Incident Reports 2010