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
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Power System Incident Reports 2025
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09/07/2025
Trip of Palmerston 220 kV A Busbar on 26 March 2025
Date of incident: 26 March 2025
570.06 KB -
16/06/2025
Trip of Kincraig – Penola West 132 kV line and Penola West – South East 132 kV line
Date of incident: 11 March 2025
479.42 KB -
23/06/2025
Trip of Farrell - Reece - Pieman No. 1 and No. 2 220 kV Lines
Date of incident: 3 February 2025
482.19 KB -
23/05/2025
Trip of Buronga 330 kV B busbar on 17 January 2025
Date of incident: 17 January 2025
476.16 KB
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Power System Incident Reports 2024
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22/05/2025
Trip of Happy Valley Morphett Vale East 275 kV line and Cherry Gardens Morphett Vale East 275 kV
Date of incident: 23 December 2024
1.3 MB -
29/04/2025
Trip of Yallourn 220 kV No. 1 Busbar
Date of incident: 12 November 2024
579.73 KB -
20/03/2025
Trip of Wagga B busbar
Date of incident: 31 October 2024
467.09 KB -
22/04/2025
Tower failures in South Australia and New South Wales
Date of incident: 16 and 17 October 2024
6.41 MB -
05/02/2025
Trip of Gordon - Chapel St No 1 and No 2 220 kV Lines
Date of incident: 19 September 2024
525.79 KB -
10/02/2025
Trip of Loy Yang Power Station 500 kV No. 4 busbar
Date of incident: 6 September 2024
473.13 KB -
24/12/2024
Trip of New Norfolk 110 kV A busbar
Date of incident: 25 August 2024
827.61 KB -
15/01/2025
Trip of Goodna 275 kV No. 2 Busbar and Goodna 275 kV No. 1 Transformer
Date of incident: 27 July 2024
502.87 KB -
20/03/2025
Final Report – Load Shedding Event in Northern New South Wales
Date of incident: 8 July 2024
913.48 KB -
15/07/2024
Preliminary Report - Load Shedding Event in Northern New South Wales
Date of incident: 8 July 2024
700.81 KB -
04/12/2024
Trip of Sydney West 330kV No. 1 SVC During Switching of Sydney West 330/132 kV No. 4 Transformer
Date of incident: 25 and 27 of June 2024
544.39 KB -
10/06/2025
Contingency analysis violations of Dapto – Tallawarra 132 kV 983 line
Date of incident: 23 June 2024
429.14 KB -
29/10/2024
Exceedance of the inverter limit at New England Solar Farm
Date of incident: 9 May 2024
486.84 KB -
04/11/2024
Exceedance of the inverter limit at Moree solar farm
Date of incident: 8 May 2024
601.9 KB -
12/12/2024
Final Report – Three-phase fault at Sheffield and trip of load in Tasmania
Date of incident: 12 April 2024
1.38 MB -
27/06/2024
Preliminary Report – Three-phase fault at Sheffield and trip of load in Tasmania
Date of incident: 12 April 2024
664.68 KB -
18/09/2024
275 kV current transformer failures in South Australia
Date of incident: between 14 March 2024 and 27 March 2024
920.36 KB -
03/10/2024
Addendum on DPV and load behaviour: 275 kV current transformer failures in South Australia
Date of incident: between 14 March 2024 and 27 March 2024
930.46 KB -
10/07/2025
Final Report - Loss of Moorabool - Sydenham 500 kV lines on 13 Feb 2024
Date of incident: 13 February 2024
4.59 MB -
16/02/2024
Preliminary Report - Loss of Moorabool - Sydenham 500 kV lines
Date of incident: 13 February 2024
2.32 MB -
06/11/2024
Non-credible islanding of the Jeeralang to Morwell 220 kV network on 13 February 2024
Date of incident: 13 February 2024
4.73 MB -
12/07/2024
Trip of Strathmore 275 kV No 2 bus and Nebo to Strathmore 275 kV No 878 line
Date of incident: 23 January 2024
501.73 KB
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Power System Incident Reports 2023
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16/05/2024
Trip of Middle Ridge 275 kV CB 5432 and CB 5422
Date of incident: 21 December 2023
435.66 KB -
09/05/2024
Trip of Braemar 275 kV No 4 Busbar and Braemar Western Downs No 8820 275 kV line
Date of incident: 29 November 2023
427.85 KB -
22/05/2024
Trip of Robertstown Tungkillo 275 kV No 1 line at the Tungkillo end only and the Robertstown No 1 and No 2 Synchronous Condensers
Date of incident: 28 November 2023
679.33 KB -
15/03/2024
Multiple incidents impacting NEM SCADA
Date of incident: between 24 January 2021 and 18 November 2023
949.69 KB -
16/04/2024
Trip of Para 275 kV West Left busbar
Date of incident: 14 November 2023
470.46 KB -
29/04/2024
Trip of MBTS 220 kV No 2 busbar
Date of incident: 3 November 2023
474.92 KB -
18/06/2024
Trip of Ross 275 kV No 2 busbar
Date of incident: 21 October 2023
986.39 KB -
10/05/2024
Trip of Haunted Gully-Moorabool and Haunted Gully-Tarrone Lines
Date of incident: 19 October 2023
451.33 KB -
22/03/2024
Trip of Moorabool No. 2 500 kV busbar
Date of incident: 19 October 2023
426.27 KB -
21/03/2024
Trip of Kincraig - Penola West 132 kV line at Kincraig
Date of incident: 17 October 2023
453.12 KB -
08/04/2024
Trip of South East SVC No 1 and 2
Date of incident: 12 October 2023
568.45 KB -
01/03/2024
Trip of Ross No1 275 kV SVC
Date of incident: 13 September 2023
543.24 KB -
18/01/2024
Trip of Tungkillo 275kV East Busbar
Date of incident: 4 September 2023
486.96 KB -
07/03/2024
Trip of Chalumbin No1 Transformer
Date of incident: 30 August 2023
483.35 KB -
21/12/2023
Trip of MOPS - BGS 500 kV line and operation of circuit breaker fail protection
Date of incident: 9 July 2023
835.43 KB -
02/04/2024
Loss of SCADA and line protection at Keilor Terminal Station
Date of incident: 29 June 2023
1.39 MB -
21/11/2023
Trip of Liddell Tomago 82 line and Liddell 1A transformer
Date of incident: 8 June 2023
914.07 KB -
12/10/2023
Trip of Moorabool Terminal Station 220 kV No. 1 busbar
Date of incident: 29 May 2023
453.2 KB -
27/02/2024
Farrell-Reece-Pieman 220 kV No.2 line three-phase fault
Date of incident: 23 May 2023
469.05 KB -
01/09/2023
Trip of Belmont 275 kV No. 2 busbar
Date of incident: 16 May 2023
487.97 KB -
22/09/2023
Trip of Liddell Tomago 330 kV line and the Tamworth SVC
Date of incident: 7 April 2023
512.72 KB -
28/08/2023
Trip of South East SVC No. 1 and 2
Date of incident: 23 March 2023
549.06 KB -
15/08/2023
Burnie 110 kV Bus Low Fault Level
Date of incident: 6 March 2023
489.29 KB -
06/07/2023
Trip of Columboola - Wandoan South 275 kV lines 8891 and 8892
Date of incident: 13 February 2023
428.52 KB
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Power System Incident Reports 2022
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31/05/2023
Trip of Kerang - Wemen - Red cliffs 220 kV line and Kiamal Synchronous Condenser Transformer
Date of incident: 11 December 2022
434.11 KB -
02/05/2023
Trip of Newport Power Station D 220 kV No. 1 bus bar
Date of incident: 16 November 2022
414.19 KB -
23/05/2025
Supplementary Report – Trip of South East – Tailem Bend 275 kV lines November 2022
Date of incident: 12 November 2022
515.59 KB -
26/05/2023
Trip of South East - Tailem Bend 275 kV lines November 2022
Date of incident: 12 November 2022
7.36 MB -
25/11/2022
Preliminary Report – Trip of South East – Tailem Bend 275kV lines
Date of incident: 12 November 2022
1.87 MB -
01/05/2023
Trip of Bulli Creek - Braemar 9902 line followed by trip of Bulli Creek - Dumaresq 8M line
Date of incident: 5 November 2022
909.95 KB -
30/06/2023
Trip of Liapootah - Palmerston - Waddamana No 1 and No 2 220 kV lines
Date of incident: 14 October 2022
1.93 MB -
28/10/2022
Preliminary Report – Trip of Liapootah – Palmerston lines
Date of incident: 14 October 2022
1.01 MB -
31/03/2023
Trip of New England SF Transformers 1 and 2 on 05 October 2022
Date of incident: 5 October 2022
456 KB -
22/02/2023
Trip of Uralla 330 kV B Bus and 330 kV CB 5012
Date of incident: 4 September 2022
489.75 KB -
03/02/2023
Armidale to Dumaresq 8C 330kV Line opened at Armidale end only
Date of incident: 29 August 2022
449.19 KB -
11/01/2023
Trip of Collector Wind Farm 330 kV A Bus
Date of incident: 26 August 2022
505.46 KB -
19/05/2023
Buronga 220 kV isolator failure and trip of multiple transmission elements
Date of incident: 25 July 2022
798.49 KB -
16/12/2022
Trip of Liddell - Muswellbrook 83 330 kV line
Date of incident: 14 July 2022
496.02 KB -
24/02/2023
South Australia Power System Oscillations
Date of incident: 23 June 2022
743.05 KB -
14/11/2022
NEM market suspension and operational challenges in June 2022
2.67 MB -
19/10/2022
Trip of Terang No 2 220 kV Busbar
Date of incident: 10 May 2022
418.1 KB -
13/09/2022
Trip of Waratah West B 330 kV Busbar
Date of incident: 26 April 2022
424.39 KB -
12/09/2022
Trip of Woree No. 1 132 kV busbar and No.1 Transformer
Date of incident: 26 April 2022
502.47 KB -
16/11/2022
Multiple separate incidents involving Buronga Synchronous Condensers
Date of incident: 30 March 2022
546.03 KB -
06/06/2022
The trip of Hazelwood - Cranbourne No. 4 500 kV line
Date of incident: 2 March 2022
470.09 KB -
06/09/2022
Trip of Red Cliffs Kiamal 220 kV line, Kiamal synchronous condenser, Buronga No. 2 and No. 3 synchronous condensers
Date of incident: 1 March 2022
580.72 KB -
27/07/2022
Trip of George Town Hadspen 220 kV line
Date of incident: 17 February 2022
454.7 KB -
15/07/2022
Trip of Davenport and Bungama Blyth West 275275 kV lines
Date of incident: 11 February 2022
785.98 KB -
04/05/2022
Trip of Sydney North 330/132 kV Transformer and 132 kV busbar
Date of incident: 10 February 2022
462.63 KB -
08/07/2022
Trip of Eildon Power Station No. 2 220 kV Bus
Date of incident: 27 January 2022
520.18 KB -
22/06/2022
Trip of Bell Bay No 3 and No 4 Potlines
Date of incident: 1 January 2022
438.38 KB
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Power System Incident Reports 2021
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20/06/2022
Trip of Rowville Terminal Station - Yallourn Power Station No.8 220 kV line
Date of incident: 30 December 2021
477.8 KB -
21/04/2022
Trip of Heywood - Alcoa Portland 500 kV line
Date of incident: 21 December 2021
450.13 KB -
28/04/2022
Operation of Frequency Control Special Protection Special Protection Scheme in Tasmania
Date of incident: 20 December 2021
411.98 KB -
04/05/2022
Trip of Alcoa Portland No.1 220 kV Busbar
Date of incident: 30 November 2021
572.85 KB -
17/02/2023
West Murray Zone Power System Oscillations
Date of incident: 16 November 2021
1.07 MB -
13/04/2022
Trip of Dederang – Wodonga 330 kV line trip at Wodonga end only
Date of incident: 27 October 2021
405.63 KB -
31/01/2022
Trip of Broken Hill - Silverton x6 220 kV line, Silverton Wind Farm and Broken Hill Solar Farm
Date of incident: 28 September 2021
479.81 KB -
01/03/2022
Trip of multiple transmission elements at Davenport 275 kV substation
Date of incident: 28 September 2021
470.81 KB -
13/04/2022
Trip of Torrens Island 66 kV East busbar
Date of incident: 22 September 2021
443.87 KB -
15/03/2022
Trip of South East Substation No 1 and No 2 Static Var Compensators
Date of incident: 22 September 2021
473.56 KB -
01/03/2022
Trip of Canowie 275 kV Circuit Breakers
Date of incident: 12 September 2021
493.91 KB -
31/01/2022
Gordon Power Station B 220 kV Busbar Trip
Date of incident: 9 September 2021
502.79 KB -
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 -
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 -
27/09/2021
Final Report - Total Loss of NEM SCADA data
Date of incident: 24 January 2021
497.24 KB -
16/02/2021
Preliminary Report - Total Loss of NEM SCADA Data
Date of incident : 24 January 2021
354.47 KB
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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 2020
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