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    Australian Energy Market Operator Australian Energy Market Operator
    • Electricity
      • 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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  • Statistical reporting streams

  • In this section
    • In this section
      Congestion information resource
      • Limits advice
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      • Statistical reporting streams
  • The CIR contains continuous reporting streams that provide stakeholders with information on constraints and resulting network congestion that are updated regularly. The CIR is also a portal to resources providing details on particular incidents.

    Annual NEM Constraint Report

    AEMO uses constraint equations to model power system congestion in the National Electricity Market dispatch engine (NEMDE) and projected assessment of system adequacy (PASA). Constraint equations can have an impact on pricing and dispatch in the electricity market. AEMO publishes this report annually to provide market participants with information about the changing congestion patterns over the previous five years.

    This report details constraint equation performance and transmission congestion related issues for each calendar year. 

    For further information on this document, please contact: Ben Blake at ben.blake@aemo.com.au

    The NEM Constraint Report 2016
    01 June 2017 (1.76 MB, pdf)
    The NEM Constraint Report 2016 Supplementary Data
    01 June 2017 (189 KB, xlsx)
    The NEM Constraint Report 2015
    23 May 2016 (1.76 MB, pdf)
    The NEM Constraint Report 2015 Supplementary Data
    23 May 2016 (189 KB, xlsx)
    The NEM Constraint Report 2014
    2 Apr 2015 (1.3 MB, pdf)
    The NEM Constraint Report 2014 Supplementary Data
    2 Apr 2015 (264 KB, xlsx)
    The NEM Constraint Report 2013
    29 Apr 2014 (1.7 MB, pdf)
    The NEM Constraint Report 2013 Supplementary Data
    29 Apr 2014 (156 KB, xlsx)
    The NEM Constraint Report 2012 Version 2
    11 Jun 2013 (5.0 MB, pdf)
    The NEM Constraint Report 2011
    16 Feb 2012 (4.31 MB, pdf)
    The NEM Constraint Report 2010
    16 Feb 2012 (2.39 MB, pdf)
    The Constraint Report 2009
    15 Feb 2010 (1.41 MB, pdf)
    Monthly Constraint Report

    The monthly constraint report details constraint equation performance and transmission congestion related issues for each month. It includes investigations of violating constraint equations, usage of the constraint automation and performance of pre-dispatch constraint equations. Transmission and generation changes are also detailed along with the number of constraint equation changes made by constraint builders.

    This report has been developed in response to a submission to the congestion information resource (CIR) consultation. AEMO welcomes comments and suggestions on the content of this report from both internal AEMO staff and participants.

    For further information on this document, please contact: Ben Blake.

    Note: Historical reports can be made available on request.

    Monthly Constraint Report - March 2018
    06 April 2018 (840 KB, pdf)
    Monthly Constraint Report - February 2018
    09 March 2018 (844 KB, pdf)
    Monthly Constraint Report - January 2018
    05 March 2018 (845 KB, pdf)
    Monthly Constraint Report - December 2017
    08 January 2018 (838 KB, pdf)
    Monthly Constraint Report - November 2017
    11 December 2017 (851 KB, pdf)
    Monthly Constraint Report - October  2017
    16 October 2017 (840 KB, pdf)
    Monthly Constraint Report - September  2017
    27 October 2017 (840 KB, pdf)
    Monthly Constraint Report - August 2017
    20 September 2017 (839 KB, pdf)
    Monthly Constraint Report - July 2017
    23 August 2017 (837 KB, pdf)
    Monthly Constraint Report - June 2017
    26 July 2017 (834 KB, pdf)
    Monthly Constraint Report - May 2017
    21 June 2017 (852 KB, pdf)
    Monthly Constraint Report - April 2017
    08 May 2017 (985 KB, pdf)
    Monthly Constraint Report - March 2017
    07 April 2017 (976 KB, pdf)
    Monthly Constraint Report - February 2017
    15 March 2017 (991 KB, pdf) 
    Monthly Constraint Report - January 2017
    07 February 2017 (853 KB, pdf) 
    Monthly Constraint Report - December 2016
    25 January 2017 (863 KB, pdf) 
    Monthly Constraint Report - November 2016
    28 December 2016 (860 KB, pdf)
    Monthly Constraint Report - October 2016
    14 November 2016 (869 KB, pdf)
    Monthly Constraint Report - September 2016
    26 October 2016 (861 KB, pdf)
    Monthly Constraint Report - August 2016
    12 September 2016 (842 KB, pdf)
    Monthly Constraint Report - July 2016
    29 August 2016 (867 KB, pdf)
    Monthly Constraint Report - June 2016
    12 July 2016 (845 KB, pdf)
    Monthly Constraint Report - May 2016
    17 June 2016 (840 KB, pdf)
    Monthly Constraint Report - April 2016
    18 May 2016 (840 KB, pdf)
    Monthly Constraint Report - March 2016
    21 April 2016 (854 KB, pdf)
    Monthly Constraint Report - February 2016
    09 March 2016 (923 KB, pdf)
    Monthly Constraint Report - January 2016
    21 April 2016 (851 KB, pdf)
    Monthly Constraint Report - December 2015
    20 January 2016 (847 KB, pdf)
    Monthly Constraint Report - November 2015
    8 December 2015 (844 KB, pdf)
    Monthly Constraint Report - October 2015
    8 December 2015 (844 KB, pdf)
    Monthly Constraint Report - September 2015
    8 October 2015 (844 KB, pdf)
    Monthly Constraint Report - August 2015
    3 September 2015 (844 KB, pdf)
    Monthly Constraint Report - July 2015
    6 August 2015 (844 KB, pdf)
    Monthly Constraint Report - June 2015
    9 July 2015 (844 KB, pdf)
    Monthly Constraint Report - May 2015
    10 June 2015 (844 KB, pdf)
    Monthly Constraint Report - April 2015
    13 May 2015 (844 KB, pdf)
    Monthly Constraint Report - March 2015
    13 April 2015 (844 KB, pdf)
    Monthly Constraint Report - February 2015
    23 March 2015 (843 KB, pdf)
    Monthly Constraint Report - January 2015
    10 February 2015 (843 KB, pdf)
    NEM Weekly Constraint Library Changes Report

    AEMO publishes a weekly summary of the constraint equations, sets and functions that have been added, modified or removed from the constraint library.

    The latest constraint library change report (updated on the first business day of the week) is available from the following link:

    http://www.nemweb.com.au/REPORTS/CURRENT/Weekly_Constraint_Reports/Current_CCR.xlsx

    Archive of previous reports:

    http://www.nemweb.com.au/REPORTS/CURRENT/Weekly_Constraint_Reports/

    Please note that the Effective Date indicates the new/updated constraint is available from that date, it may not necessarily be invoked until a later time.


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