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 and the guidelines established by the Reliability Panel.

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.

AEMO has classified each incident on the basis of impact in relation to the level of load or generation loss

 Impact  Explanation
 NIL  No loss of load or generation
 Not Significant  Loss of load or generation less than 50MW
 Significant  Loss of load or generation exceeding 50MW but less than 250MW
 Very Significant  Loss of load or generation exceeding 250MW

AEMO maintains statistics of these reviewable operating incidents in order to identify any trends in performance.

Statistics of Operating Incidents:Reporting Period - January 2007 to December 2013
31 March 2014 | filesize: 1.62 mb (.pdf)

AEMO maintains a list of Critical Transmission Elements for the purpose of identifying Reviewable Operating Incidents.

Critical Transmission Elements for Identifying Reviewable Operating Incidents
21 March 2013 | filesize: 264 kb (.pdf)
 

A number of reviewable incidents may result from or result in AEMO reclassifying a non-credible contingency as a credible contingency.  In accordance with Clause 4.2.3A(i) of the NER AEMO is required to report on the reasons for all decisions to reclassify contingencies.

Review of Power System Reclassification Events -  1/5/2015 -31/10/2015
8 April 2016 | filesize:  1.01 MB (.pdf)
 
Review of Power System Reclassification Events -  1/11/2014 -30/4/2015
7 September 2015 | filesize:  1.76 MB (.pdf)
 
Review of Power System Reclassification Events – 1/5/2014 – 31/10/2014
26 August 2015 | filesize:  811 KB (.pdf)
 
Review of Power System Reclassification Events – 1/11/2013 – 30/04/2014
17 July 2014 | filesize:  1.00 MB (.pdf)
  
Review of Power System Reclassification Events – 1/05/2013 – 31/10/2013
23 January 2014 | filesize: 709 kb (.pdf)
 

Review of Power System Reclassification Events -1/11/2012 - 30/4/2013
07 June 2013 | filesize: 865 kb (.pdf)
 

Review of Power System Reclassification Events 1/5/2012 - 31/10/2012
07 June 2013 | filesize: 444 kb (.pdf)
 

Archived reports are available from AEMO’s Information & Support Hub

Filter Reports by:

Search Text
Jurisdiction / State
Impact
Date incident occurred  
Date of publication  

Reports from the previous 12 months




Date of
Incident

Incident

Target/Actual Publication Date

23 Apr 2016  Trip of both SVCs at South East substation  30 Jun 2016 
23 Apr 2016  Trip of A! 500/220kV transformer and No1 SVC at Rowville substation  30 Jun 2016 
07 Apr 2016  Trip of No1 220kV busbar at Jeeralang Substation  30 Jun 2016 
22 Mar 2016  Trip of Jeeralang No2 220kV busbar  01 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 
06 Dec 2015  Trip of Yallourn No.2 220 kV busbar and Yallourn Units 1 and 2  24 Mar 2016 
20 Nov 2015  The disconnection of 125MW of customer load and the trip Lines of 77 and 78 at Ingleburn Substation  04 Feb 2016 
12 Nov 2015  Trip of Horsham-Red Cliffs 220 kV transmission line and de-loading of Murraylink  27 Jan 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