Exit substitution

Exit capacity substitution is a mechanism that facilitates the permanent transfer of unsold baseline exit capacity on the gas National Transmission System (NTS) at one or more exit points, to an NTS exit point where incremental capacity in excess of baseline has been requested.

Under its Gas Transporter Licence, National Grid Gas is responsible for the Exit Capacity Substitution Methodology Statement which sets out how this is managed.

Publications and updates

  • Published: 4th Nov 2015
  • Decisions
  • 1 Associated documents
This letter consents to the National Grid Gas proposal for exit capacity substitution to Teesside Hydrogen National Transmission System (NTS) Exit Point from Billingham ICI (Terra Billingham).

  • Published: 16th Jan 2015
  • Decisions
  • 1 Associated documents
This letter approves the substitution of exit capacity between NTS Exit Points - from Tatsfield to Yelverton and from ICI Runcorn, Weston Point and Rocksavage to Mickle Trafford.

  • Published: 16th Dec 2013
  • Decisions
  • 1 Associated documents
This letter highlights and corrects a drafting error in our consent to National Grid Gas plc’s proposal to substitute NTS Exit (Flat) Capacity on 16 December 2013. We have now corrected this mistake, please see the amended consent below.

  • Published: 16th May 2013
  • Decisions
  • 1 Associated documents
This letter contains our decision to approve the Exit Capacity Substitution and Revision Methodology Statement National Grid Gas submitted on 28 March 2013.

  • Published: 20th Dec 2012
  • Decisions
  • 1 Associated documents
This approves a substitution of exit capacity from Tatsfield Offtake NTS Exit point to Damhead Creek Power Station NTS exit point.

  • Published: 11th May 2012
  • Decisions
  • 1 Associated documents
NGG submitted its Gas Exit Capacity Substitution and Revision Methodology Statement to the Authority for approval on 13 April 2012.

  • Published: 4th Apr 2011
  • Decisions
  • 1 Associated documents
NGG submitted its Gas Exit Capacity Substitution and Revision Methodology Statement to the Authority for approval on 4 January 2011. This letter sets out the reasons for the Authority’s decision to approve implementation of the methodology.

  • Published: 11th Feb 2011
  • Closed: 11th Mar 2011
  • Consultations & responses
  • 9 Associated documents
After a series of workshops in 2010, NGG submitted its proposed exit capacity substitution and revision methodology for approval to the Authority on 4 January 2011. This consultation assesses the impact of implementing the methodology submitted by NGG.

  • Published: 11th Jan 2011
  • Open letters & correspondence
  • 1 Associated documents
This letter serves notice of the Authority's intention to conduct an impact assessment on the exit capacity substitution and revision methodology statements submitted by NGG on 4 Jan 2011

  • Published: 20th Dec 2010
  • Decisions
  • 1 Associated documents
The Authority has made changes to Special Condition C8E of National Grid’s gas transporter license. The mod gives more time to conduct an impact assessment for changes to the exit capacity substitution and exit capacity revision methodology statements.

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