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Incident reports

AEMO publishes a variety of information and documents required under the WEM Rules. Should an unusual market or dispatch event occur, AEMO may provide a report describing the event. These reports are published in accordance with clauses 3.8.3(a) and 10.5.1 (s) of the WEM Rules.

Under the WEM Rules, AEMO must make the following information available from the Market Web Site:

  • Event reports explaining what happened during unusual market or dispatch events, but not aspects of such reports which, in accordance with its confidentiality status class, cannot be made public.

Investigation into the power system incident on 28 November 2007

Report [133kB]

The Independent Market Operator (IMO) was required by Clause 3.8.2 of the WEM Rules to coordinate an investigation into incidents which were notified to it by System Management under Clause 3.8.1, and which the IMO considered to have had, or had the potential to have had, a significant impact on the effectiveness of the market. The IMO engaged the PA Consulting Group as an Independent Expert under Clause 3.8.2(d) to provide a report on the incident to the IMO.

This report was published in accordance with WEM Rule 3.8.3(a) and explains the incident and recommendations that could be taken following the incident.

STEM Suspension – 22 February 2009

Report [412kB]

On 22 February 2009, failure of both air-conditioning units in our service provider’s server room caused overheating and subsequent failure of WEMS market-related IT systems.

STEM Suspension – 30 October 2007

Report [504kB]

On 29 October 2007, a small fire at the IMO market systems computer room resulted in a suspension of the Short Term Energy Market (STEM). This report explains the incident and discussed actions taken following the incident.

STEM Suspension – 2 June 2007

Report [104kB]

On 1 June 2007, the STEM was suspended for trading day 2 June 2007 due to an error in calculating Market Participants' Net Contract Positions (NCP) ahead of the STEM Auction. This report discusses the causes of this incident and the steps the IMO has taken to minimise the possibility of recurrence.

STEM Suspended – Trading Day 11 February 2007

Report [105kB]

On Saturday 10 February 2007, issues relating to the Wholesale Electricity Market Systems resulted in the suspension of the STEM for Trading Day 11 February 2007. The attached report explains this incident and outlines actions and recommendations to minimise the probability of future occurrence.

Database Issue – 28 January 2007

Report [94kB]

On Sunday 28 January 2007, an issue with the Wholesale Electricity Market Systems affected the opening and closing times of the Resource Plan window. This report provides a full explanation of this incident and details steps that have been taken to minimise the probability of recurrence.

STEM Suspended – Trading Day 27 October 2006

Report [56kB]

On 26 October 2006, the IMO suspended the STEM due to issues related to the determination of participant limits. This report details this incident and describes steps that have been taken to minimise the likelihood of recurrence.

STEM Suspended – Trading Day 28 September 2006

Report [61kB]

On 27 September 2006, the IMO suspended the Short Term Energy Market (STEM) for the Trading Day 28 September 2006, due to irregularities identified in the STEM auction results. This report explains this issue in detail and discusses recommendations for decreasing the likelihood of recurrence.

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