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: 23rd Dec 2020
  • Decisions
  • 1 Associated documents
We have decided to approve modification proposal UNC748.

  • Published: 23rd Dec 2020
  • Open letters and correspondence
  • 1 Associated documents
This letter sets out our views to National Grid Gas Transmission on Transmission Services Revenue Recovery Charges.

  • Published: 18th Dec 2020
  • Decisions
  • 1 Associated documents
We have decided to approve modification proposal UNC727.

  • Published: 18th Nov 2020
  • Decisions
  • 1 Associated documents
Authority Response to EDF’s appeal to the implementation of Uniform Network Code modification UNC692.

  • Published: 14th Oct 2020
  • Decisions
  • 1 Associated documents
Our decision on urgency for UNC740 and IGT149 'Amending the Formula Year AQ approach for 2021/2 Formula Year'.

  • Published: 18th Sep 2020
  • Decisions
  • 1 Associated documents
The Authority's decision on modification proposal UNC716/A: Revision of Overrun Charge Multiplier.

  • Published: 16th Jul 2020
  • Open letters and correspondence
  • 1 Associated documents
Notice of Impact Assessment on UNC728/A/B/C/D.

  • Published: 8th Jul 2020
  • Decisions
  • 1 Associated documents
Decision on urgency for modification to the UNC.

  • Published: 30th Jun 2020
  • Decisions
  • 1 Associated documents
We have decided not to grant urgent status for UNC729.

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