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      • AEMO operates Australia's National Electricity Market (NEM), the interconnected power system in Australia’s eastern and south-eastern seaboard, and the Wholesale Electricity Market (WEM) and power system in Western Australia.
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      • AEMO operates gas retail markets in New South Wales and the Australian Capital Territory, Queensland, South Australia, Victoria, and Western Australia. AEMO also operates wholesale gas markets in south-eastern Australia, those being the Declared Wholesale Gas Market in Victoria (DWGM), the Short Term Trading Market in Adelaide, Brisbane and Sydney (STTM), and the Gas Supply Hub (GSH), whose trading locations are based at Wallumbilla in Queensland, and Moomba in South Australia. AEMO also operates the Natural Gas Services Bulletin Board (GBB), and is system operator of the Victorian Gas Declared Transmission System. AEMO is also responsible for Gas Services Information functions in Western Australia.
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  • Power system operating incident reports

  • In this section
    • In this section
      Archive of 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 2018

    Date of
    Incident

    Incident

    Report Publication Date

    31/01/2018 Offloading of both SMTS-SYTS lines 21 Mar 2018

    Power System Incident Reports 2017

    Date of
    Incident

    Incident

    Report Publication Date

    24/10/2017 Trip of Mortlake-Heywood-Alcoa 500kV line and Alcoa No1 500kV bus 27 Mar 2018
    24/10/2017 Trip of Mudgeeraba 2/4 110kV busbars 13 Feb 2018
    09/10/2017 Trip of Davenport 275kV West bus 26 Mar 2018
    01/09/2017 Offloading of ROTS-SMTS-KTS 500kV lines 20 Nov 2017
    31/07/2017 Simultaneous trip of South East No.1 and No.2 s75 kV SVCs 20 Sep 2017
    27/07/2017 Trip of 330kV Main busbar at Vales Point 26 Sep 2017
    28/06/2017 Capital A & C 330kV busbar tripped on 3 May 2017 and 28 June 2017 01 Sep 2017
    06/06/2017 Trip of Brunswick No2 220kV busbar 03 Aug 2017 
    03/06/2017 Trip of Vales Point 330kV GEN busbar 26 July 2017
    31/05/2017 Loy Yang 1/3 500kV busbar tripped 30 Aug 2017 
    18/05/2017 Keilor No3 220kV busbar tripped 01 Sep  2017
    08/05/2017  Trip of Loy Yang A1 & A2 generating units within 30 minutes 21 Sep 2017
    07/05/2017 Trip of both Colongra-Munmorah 330kV lines 10 Aug 2017 
    30/03/2017 Outage of Lismore SVC on 30 March 2017 18 May 2017 
    29/03/2017 Trip of Mudgeeraba 110kV busbar 12 July 2017 
    12/03/2017 Trip of Baslink and UFLS in Tasmania 14 Jun 2017 
    03/03/2017 Fault at Torrens Island switchyard 10 Mar 2017
    19/02/2017 Trip of Eildon 220kV busbar in Victoria 25 Mar 2017 
    13/02/2017 Multiple line outages in the Mt England-Tarong area 03 Aug 2017
    13/02/2017 Multiple 275kV transmission line trips at Mt England in QLD 26 July 2017
    11/02/2017  Trip of multiple transmission elements in the southern NSW area 15 Sep 2017
    10/02/2017 System event report NSW 22 Feb 2017 
    08/02/2017 System event report SA 15 Feb 2017
    Power System Incident Reports 2016

    Date of
    Incident

    Incident

    Actual Publication Date

    20/12/2016 Load shedding in Tasmania - Final Report 06 April 2017
    Load shedding in Tasmania - Preliminary Report 22 Dec 2016
    20/12/2016 Trip of both Eildon - Mt Beauty No1 and No2 220kV lines 06 April 2017
    01/12/2016 Power system not secure in VIC & SA 14 Jun 2017
    01/12/2016 Load shedding in SA - Final Report 28 Feb 2017
    Load shedding in SA - Preliminary Report 01 Dec 2016
    29/11/2016 Power system not secure in VIC 13 July 2017 
    28/11/2016 Power system not secure in NSW 13 July 2017 
    13/11/2016  Power system not secure in SA 06 April 2017
    28/09/2016


    Black System in South Australia - Final Integrated Report 28 Mar 2017
    Black System in South Australia - Third Report 16 Dec 2016 
    Black System in South Australia - Update to Preliminary Report 19 Oct 2016 
    Black System in South Australia - Preliminary Report 05 Oct 2016
    31 Jul 2016 Trip of both Farrell – Reece No.1 & No.2 220kv lines 20 Oct 2016 
    16 Jun 2016 Trip of No1 & No3 500kV busbars at Loy Yang 14 Sep 2016
    15 Jun 2016 Power system not secure in Victoria region 16 Nov 2016
    08 Jun 2016 Trip of Yallourn No.2 220kV bus and Yallourn units 1 & 2 24 Aug 2016
    07 Jun 2016 Trip of No.2 & No.4 220kV busbars at Richmond substation 04 Aug 2016
    26 May 2016 Trip of South East-Tailem Bend No.1 line and South East No.1 SVC 24 Aug 2016
    23 May 2016 Power system in Victoria not in a secure operating state 13 Oct 2016
    28 Apr 2016  Trip of A! 500/220kV transformer and No1 SVC at Rowville substation  30 Jun 2016 
    23 Apr 2016  Trip of both SVCs at South East substation  30 Jun 2016 
    07 Apr 2016  Trip of No1 220kV busbar at Jeeralang Substation  14 Sep 2016 
    22 Mar 2016  Trip of Jeeralang No2 220kV busbar  08 Jun 2016 
    09 Feb 2016  Simultaneous trip of Gordon - Chapel Street No 2, Liapootah - Wayatinah and Wayatinah - Catagunyah 220KV transmission lines in Tasmania.  05 May 2016 
    13 Jan 2016  Power system not secure - Vic region  14 Apr 2016 
    Power System Incident Reports 2015

    Date of
    Incident

    Incident

    Target/Actual Publication Date

    06 Dec 2015  Trip of Yallourn No.2 220 kV busbar and Yallourn Units 1 and 2  24 Mar 2016 
    20 Nov 2015 Trip of both 330kV lines supplying Ingleburn substation in NSW 04 Aug 2016
    12 Nov 2015  Trip of Horsham-Red Cliffs 220 kV transmission line and de-loading of Murraylink  29 Aug 2016 
    01 Nov 2015  Load shedding in South Australia  01 Feb 2016 
    13 Oct 2015  Power system not secure in Queensland Region  20 May 2016 
    17 Sep 2015  Trip of South East to Tailem Bend No.1 275 kV transmission line and No.1 SVC at South East Substation  01 Feb 2016 
    18 Aug 2015  Contingency Violation Associated with Murraylink Control Issues  03 Mar 2016 
    02 Aug 2015  Under Frequency Load Shedding in Tasmania  09 Oct 2015 
    11 Jul 2015  Trip of Lower Tumut – Upper Tumut 64 330 kV Line and Canberra – Lower Tumut 7 300 kV Line Open at Canberra End Only  18 Sep 2015 
    02 Jul 2015  Trip of Bannaby – Marulan 36 330 kV Line at Bannaby End Only and Trip of the Bannaby 330 kV B Bus  10 Sep 2015 
    27 Jun 2015  Trip of Rowville No. 1 220 kV Bus  08 Oct 2015 
    25 Jun 2015  Trip of Clare South – Townsville South 132 kV Line and Strathmore SVC  07 Sep 2015 
    27 May 2015 Trip of Capital Wind Farm A and C 330kV buses 05 Aug 2015
    25 Apr 2015 Trip of multiple 220kV lines between Dederang-Glenrowan-Shepparton 03 Jul 2015
    04 Mar 2015 Contingent overload of 132kV lines between Waterloo and Robertstown 05 Jun 2015
    23 Feb 2015 Contingent overload on Morwell B3 Transformer 19 Jun 2015
    13 Feb 2015 Trip of APD Heywood Tarone and Moorobal Tarone 500 kV transmission lines  25 Aug 2015
    07 Feb 2015 Trip of APD-Heywood-Tarrone 500kV line and APD No3 500kV bus 21 Sep 2015
    24 Jan 2015 Trip of Bayswater-Regentville and Bayswater-Sydney West 330kV lines 24 Jun 2015
    24 Jan 2015 Trip of Keilor-South Morang 500kV line at the Keilor end only 10 Apr 2015
    21 Jan 2015 Trip of Ross-Chalumbin 275kV lines and multiple 132kV lines 24 Sep 2015
    Power System Incident Reports 2014

    Date of
    Incident

    Incident

    Target/Actual Publication Date

    11 Dec 2014 Trip of Mullumbimby Dunoon Lismore 132 kV lines 9U6 and 9U7 25 Feb 2015
    10 Dec 2014 Trip of Basslink and Transmission lines in Tasmania
    • Trip of transmission lines in Tasmania followed by the loss of Basslink on 10 and 16 Dec 2014 and 23 Feb 2015
    • Basslink and TasNetworks Joint Report Mar 2015
    • Basslink Fault Response History
    • Basslink Incident Final AEMO Report
    • AEMO System Incident Investigation Report
    • Joint System Incident Investigation for the Tasmanian Region
    13 May 2015
    24 Nov 2014 Trip of 220 kV transmission lines at Mt Beauty 06 Feb 2015
    27 Oct 2014 TAS Power system Insecure for more than 30 mins 19 Jun 2015
    23 Oct 2014 Trip of  Liddell Tamworth Line 84 and Bayswater Unit 3 06 Jan 2015
    16 Sep 2014  Trip of Keilor No. 1 220 kV Busbar 05 Dec 2014
    11 Sep 2014 Trip of Braemar-Western Downs 275 kV Line 8864 at Braemar End 21 Nov 2014
    13 Aug 2014 Trip of Dederang-Mt Beauty No.1 and No.2 220 kV transmission lines 19 Sep 2014
    02 Aug 2014 Trip of East Rowville No.2 and Cranbourne No.3 220-66 kV transformers 19 Sep 2014
    18 Jul 2014 Trip of Le Fevre 275 / 66 kV Transformers and Quarantine Unit 5 02 Dec 2014
    14 Jul 2014 Trip of Torrens Island Units B3 and B4 22 Sep 2014
    01 Jul 2014 Trip of Basslink Busbar at Loy Yang End 09 Sep 2014
    09 May 2014 Trip of APD-Heywood-Tarrone and Moorabool-Tarrone 500 kV Transmission Lines 29 Aug 2014
    01 May 2014 Trip of 330 kV B1 Busbar at Newcastle Substation 23 Jun 2014
    25 Apr 2014 Trip of 500 kV Busbar Section 3 at Hazelwood Terminal Station 18 Jun 2014
    23 Apr 2014 Trip of Ross-Chalumbin 858 275 kV Transmission Line at the Ross End 18 Jun 2014
    30 Mar 2014 Trip of Calvale No.2 275 kV Busbar and Calvale-Halys Double Circuit Transmission Line 06 Jun 2014
    26 Mar 2014 Trip of Nebo 275 kV Busbar 23 May 2014
    19 Mar 2014 Trip of Bannaby-Mt Piper 500 kV line and Bayswater Unit 4 28 May 2014
    07 Feb 2014 Trip of Three 500 kV Circuit Breakers at Hazelwood Terminal Station 23 Apr 2014
    03 Feb 2014 Trip of Kemps Creek-Eraring 500 kV line at Kemps Creek End 04 Apr 2014
    29 Jan 2014 Trip of Ringwood No.2 220 kV Busbar 04 Apr 2014
    22 Jan 2014 Trip of Rowville - Thomastown 220 kV Transmission Line at the Rowville End 27 Mar 2014
    15 Jan 2014 Trip of Red Cliffs Horsham and Red Cliffs Wemen Kerang 220 kV transmission line 19 May 2014
    15 Jan 2014 Trip of Hazelwood to Morwell 220 kV Transmission Line at the Hazelwood End 26 Mar 2014
    14 Jan 2014 Trip of South Morang to Thomastown 220 kV Transmission Line at the Thomastown End 10 Feb 2014
    05 Jan 2014 Trip of Rowville Yallourn 220 kV Transmission Line and Multiple Wind Farms 04 Apr 2014
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