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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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  • Loss factors and regional boundaries

  • In this section
    • In this section
      Distribution loss factors for the 2018-19 Financial Year
      Distribution loss factors for the 2017-18 Financial Year
      Distribution loss factors for the 2016-17 Financial Year
      Distribution loss factors for the 2015-16 financial year
      List of regional boundaries and marginal loss factors
  • As electricity flows through the transmission and distribution networks, energy is lost due to electrical resistance and the heating of conductors. The losses are equivalent to approximately 10% of the total electricity transported between power stations and market customers.

    Energy losses on the network must be factored in at all stages of electricity production and transport, to ensure the delivery of adequate supply to meet prevailing demand and maintain the power system in balance. In practical terms, this means more electricity must be generated than indicated in simple demand forecasts to allow for this loss during transportation.

    The impact of network losses on spot prices is mathematically represented as transmission and distribution loss factors. Loss factors are calculated and fixed annually to facilitate efficient scheduling and settlement processes in the NEM.

    Methodology

    • Methodology for Calculating Forward-Looking Transmission Loss Factors

    Guidelines

    • Treatment of Loss Factors
    • Proportioning of Inter-Regional Losses Within Regions

    Transmission Loss Factors

    Regional Boundaries and Marginal Loss Factors for the 2018-19 Financial Year
    29 March 2018 (1.7 MB, pdf)
    2018-19 MLF Applicable from 01 July 2018 to 30 June 2019
    29 March 2018 (1.3 MB, pdf)
    Regional Boundaries and Marginal Loss Factors for the 2017-18 Financial Year - updated 06 November 2017
    13 November 2017 (3.2 MB, pdf)
    2017-18 MLF Applicable from 01 July 2017 to 30 June 2018 - updated 06 November 2017
    13 November 2017 (82 KB, xlsx)
    Regional Boundaries and Marginal Loss Factors for the 2016–17 Financial Year
    05 January 2017 (2.2 MB, pdf)
    2016–17 MLF Applicable from 1 July 2016
    05 January 2017 (92 KB, xlsx)
    • Regional Boundaries and Marginal Loss Factors for the 2015–16 Financial Year
    • Regional Boundaries and Marginal Loss Factors for the 2014–15 Financial Year
    • Regional Boundaries and Marginal Loss Factors for the 2013–14 Financial Year
    • Regional Boundaries and Marginal Loss Factors for the 2012–13 Financial Year
    • Regional Boundaries and Marginal Loss Factors for the 2011–12 Financial Year
    • Regional Boundaries and Marginal Loss Factors for the 2010–11 Financial Year
    • Regional Boundaries and Marginal Loss Factors for the 2009–10 Financial Year
    • Regional Boundaries and Marginal Loss Factors for the 2008–09 Financial Year

    Distribution Loss Factors

    • Distribution Loss Factors for the 2018–19 Financial Year (743 KB, pdf)
    • Distribution Loss Factors for the 2017–18 Financial Year (673 KB, pdf)
    • Distribution Loss Factors for the 2016–17 Financial Year (657 KB, pdf)
    • Distribution Loss Factors for the 2015–16 Financial Year (253 KB, pdf)
    • Distribution Loss Factors for the 2014–15 Financial Year
    • Distribution Loss Factors for the 2013–14 Financial Year
    • Distribution Loss Factors for the 2012–13 Financial Year
    • Distribution Loss Factors for the 2011–12 Financial Year
    • Distribution Loss Factors for the 2010–11 Financial Year
    • Distribution Loss Factors for the 2009–10 Financial Year
    • Distribution Loss Factors for the 2008–09 Financial Year

    Archived loss factor documents may be obtained upon request from the AEMO Information & Support Hub.

    Provision of indicative marginal loss factors

    Interested parties may on occasion require marginal loss factors (MLFs) under conditions that differ from the Forward Looking Loss Factor (FLLF) methodology. Examples include:

    • A proponent may wish to assess the potential impact on published MLFs if a generating unit is installed or upgraded at a particular connection point.
    • A market customer may wish to assess the impact on the published MLF at a connection point without the contribution of a nearby generating unit.
    • A market participant may wish to assess the MLF of an embedded generator for which AEMO does not normally calculate and publish an MLF.

    To assist interested parties with such requests, AEMO currently provides a service to calculate indicative MLFs under non-standard assumptions for a nominal fee.The following document provides details of the indicative MLF calculation process, including fees and data requirements.

    Provision of Indicative Marginal Loss Factors
    13 December 2013 (164 KB, pdf)


    Indicative extrapolation input data for 2018-19 Marginal Loss Factors

    AEMO conducted an indicative extrapolation study to assist generators in determining whether the historical generation data used by AEMO is reasonable for the 2018-19 MLFs calculation.

    Indicative extrapolation input data for 2018-19 Marginal Loss Factors:

    • Indicative extrapolation input data for 2018-19 loss factors (391 KB, pdf)
    • Indicative extrapolation results for 2018-19 loss factors (100 KB, xlsx)
    Archive
    Indicative extrapolation input data for 2017-18 loss factors
    28 October 2016 | filesize: 391 KB (pdf)
    Indicative extrapolation study results for 2017-18 loss factors
    28 October 2016 | filesize: 100 KB (xlsx)
    Indicative extrapolation input data for 2016–17 loss factors
    11 November 2015 | 486 KB (pdf)
    Indicative extrapolation study results
    11 November 2015 | 78.9 KB (xlsx)
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