Uniform Network Code

The Uniform Network Code (UNC) is the hub around which the competitive gas industry revolves, comprising a legal and contractual framework to supply and transport gas.

It has a common set of rules which ensure that competition can be facilitated on level terms. It governs processes, such as the balancing of the gas system, network planning, and the allocation of network capacity.

The introduction of the UNC came about following the sale of National Grid’s four Distribution Network (GDN) businesses. While each new GDN owner, along with National Grid Gas, is still required to produce its own Network Code, to prevent inappropriate fragmentation the substantive provisions of these Codes are incorporated by reference to a common document known as the UNC.   If you wish to discuss whether you need to be a party to this code and, if so, how to become one, please contact the Joint Office of Gas Transporters directly.

Uniform Network Code Modifications

Our decisions on proposed changes to this code are included below.

Publications and updates

  • Published: 18th Jun 2021
  • Decisions
  • 1 Associated documents
We have rejected this modification to the UNC.

  • Published: 4th Jun 2021
  • Guidance, Open letters and correspondence
  • 2 Associated documents
Open letter in response to National Grid Gas statement on the future of gas transmission charging.

  • Published: 27th May 2021
  • Decisions
  • 1 Associated documents
We have approved this modification to the UNC.

  • Published: 19th May 2021
  • Decisions
  • 1 Associated documents
We have decided to approve modification proposal UNC764.

  • Published: 30th Apr 2021
  • Decisions
  • 1 Associated documents
Article 28(2) TAR NC motivated decision on the items mentioned in Article 28(1) TAR NC.

  • Published: 27th Apr 2021
  • Decisions
  • 2 Associated documents
We have approved modification UNC728B for implementation on 1 October 2021.

  • Published: 14th Apr 2021
  • Decisions
  • 1 Associated documents
We have decided to grant urgent status for UNC764.

  • Published: 29th Mar 2021
  • Decisions
  • 1 Associated documents
We have approved this modification to the UNC.

  • Published: 19th Mar 2021
  • Decisions
  • 1 Associated documents
We have rejected this modification to the UNC.

  • Published: 19th Mar 2021
  • Decisions
  • 1 Associated documents
We have rejected this modification to the Uniform Network Code.

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