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  • Transmission Charging Methodology CUSC Open Letters

  • This page contains documents relating to open letters and informal consultations relating to Transmission TNUoS charging methodology as defined in the CUSC.

    For policy decisions made on the TNUoS charging methodology, but not codified in the Connections and Use of System Code please see the methodology open letters page.

  • If you have any feedback on this web page, suggestions for ways to improve it or queries relating to this page then please contact Charging.Enquiries@NationalGrid.com
  • Current Charging Arrangements for Transmission Connected Storage

  • 03 Feb 2017
    Guidance on how transmission connected storage is currently charged today
    126 KB

  • Potential Transmission Charging Arrangements at Exporting Grid Supply Points

  • Original open letter / consultation:
  • 06 Aug 2015
    Informal Consultation on Potential Transmission Charging Arrangements at Exporting Grid Supply Points
    919 KB

    19 Nov 2015
    Consolidated responses to open letter consultation
    7093 KB

  • Addendum to original consultation:
  • 24 Sep 2015
    Addendum to Informal Consultation
    316 KB

  • Open Letter Update:
  • 11 Apr 2016
    Potential Transmission Charging Arrangements at Exporting Grid Supply Points - Update letter
    116 KB


  • User Commitment for Generator Focused Anticipatory Investment

  • 22 May 2015
    Conclusions Letter on GFAI User Commitment April 2015 v1_0
    303 KB

    20 Jun 2014
    Open Letter on GFAI User Commitment June 2014
    97 KB

    22 May 2015
    Balfour Beatty Response
    79 KB

    22 May 2015
    Blue Transmission Response
    233 KB

    22 May 2015
    DONG Energy Response
    104 KB

    22 May 2015
    ENA_OFTO_Forum_Response
    223 KB

    22 May 2015
    Transmission Investment response
    170 KB


  • Options for Treatment of Western Isles Anticipatory Investment in the TNUoS Charging Methodology

  • Original open letter / consultation:
  • 15 Dec 2014
    Open Letter on Options for Treatment of Western Isles Anticipatory Investment in TNUoS Charging Methodology
    77 KB

  • Final Guidance Letter:
  • 18 Jun 2015
    Anticipatory Investment guidance letter May 2015
    166 KB

  • Responses:
  • 11 Feb 2015
    Response to Anticipatory Investment open letter - EDF
    127 KB

    11 Feb 2015
    Response to Anticipatory Investment open letter - EOn
    41 KB

    11 Feb 2015
    Response to Anticipatory Investment open Letter - FOL
    184 KB

    11 Feb 2015
    Response to Anticipatory Investment open letter - GDF
    307 KB

    11 Feb 2015
    Response to Anticipatory Investment open letter - HIE
    35 KB

    11 Feb 2015
    Response to Anticipatory Investment open letter - Sc Renewables
    164 KB

    11 Feb 2015
    Response to Anticipatory Investment open letter - SPR
    131 KB

    11 Feb 2015
    Response to Anticipatory Investment open letter - Uisenis
    163 KB

    11 Feb 2015
    Response to Anticipatory Investment open letter - Western Isles Council
    439 KB


  • Many of the files available to download on this page are Acrobat PDF files. To access these you will need Acrobat Reader which is available from the Adobe web site.