Loss factors
In accordance with section 2.27 of the Market Rules, by 1 June of each year Western Power must calculate and provide to the IMO Loss Factors for each connection point in its network. Where Western Power fails to provide the IMO with the Loss Factors by 1 June, the IMO must continue to use the equivalent Loss Factors from the previous year until such time as Western Power has provided the IMO with the new Loss Factors and those Loss Factors have taken effect.
The IMO must publish the Loss Factors as soon as practicable after receiving them from Western Power. The IMO must also publish the time from which the Loss Factors will apply.
A Market Participant may seek a re-assessment by the IMO of any Loss Factor applying to a Scheduled Generator, Non-Scheduled Generator, Curtailable Load, Interruptible Load, Dispatchable Load or Non-Dispatchable Load registered by that Market Participant. The Market Participant must apply to the IMO in writing within 15 Business Days of receiving the notification of the Loss Factors, stating the Loss Factors that it believes to be in error and its reasons for believing that the Loss Factors should take some other value.
The links below provide further information on the Loss Factors which apply from 1 July 2012.
New Distribution Loss Factors 2012_13 QDWF [95 bytes] - 21 February 2013
New Transmission Loss Factors 2012_13 TMBA [96 bytes] - 04 December 2012
New Transmission Loss Factors 2012_13 TMDP [110 bytes] - 21 August 2012
New Transmission Loss Factors 2012_13 TMGS [113 bytes] - 21 August 2012
New Distribution Loss Factors 2012_13 QWHF [93 bytes] - 07 August 2012
New Distribution Loss Factors 2012_13 QANF [91 bytes] - 07 August 2012
Distribution Loss Factors 2012-13 [7kB] - 06 June 2012
Transmission Loss Factors 2012-13 [6kB] - 06 June 2012
Western Power 2012-13 Loss Factors Report [201kB] - 06 June 2012
The links below provide further information on the Loss Factors which apply from 1 July 2011.
New Distribution Loss Factors 2011_12 QZSC [106 bytes] - 21 May 2012
New Transmission Loss Factors 2011_12 WCTE [88 bytes] - 08 November 2011
New Distribution Loss Factors 2011_12 QTES [16kB] - 18 August 2011
Distribution Loss Factors 2011-12 [15kB] - 08 August 2011
New Transmission Loss Factors 2011_12 WCGW [95 bytes] - 08 August 2011
The links below provide further information on the Loss Factors which apply from 1 July 2010.
New Transmission Loss Factors 2010_11 WCWG [95 bytes]
New Distribution Loss Factors 2010_11 QMBW [105 bytes]
New Distribution Loss Factors 2010_09 QRGP [115 bytes]
New Distribution Loss Factors 2010_09 QFLM [117 bytes]
New Distribution Loss Factors 2010_08 QHVI [96 bytes]
The links below provide further information on the Loss Factors which apply from 1 July 2009.
New Distribution Loss Factors 2009_10 QR12 [122 bytes]
New Distribution Loss Factors 2009_10 QTMH [93 bytes]
New Distribution Loss Factors 2009_10 QPHG [94 bytes]
New Distribution Loss Factors 2009_10 QHFM [96 bytes]
The links below provide further information on the Loss Factors which apply from 1 October 2008. New Loss Factors or Loss Factors amended after 1 October 2008 apply as per the dates in each file:
New Distribution Loss Factors 2008_09 QDMS [97 bytes]
New Distribution Loss Factors 2008_09 QBGM [100 bytes]
New Distribution Loss Factors 2008_09 QBMA QBMB [147 bytes]
New Transmission HV Loss Factors WBGM TBLB [137 bytes]
New Transmission HV Loss Factors WNGK [91 bytes]
Western Power Letter to IMO [85kB]
The links below provide further information on the 2007/08 Loss Factors which applied until 1 October 2008:
Western Power Letter to IMO [50kB]
The Loss Factor procedure can be found here.
This web page is published in accordance with Market Rule 10.5.1 (l).