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Energy codes

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About industry codes

Industry codes underpin the electricity and gas wholesale and retail markets. Licensees are required to maintain, become party to, or comply with the industry codes in accordance with the conditions of their licence.

Code administrators and the Code Administration Code of Practice (CACoP)

Code Administrators are the point of contact for each code. They can provide information including how to become a party to the code (if appropriate) and the rules on modifying the code. Code Administrators have committed to operating their code administration functions in accordance with the Code Administration Code of Practice (CACoP).

Code users and administrators developed the CACoP based on the principles that code administrators and code modification processes will:

  • promote inclusive, accessible and effective consultation;
  • be governed by processes that are transparent and easily understood;
  • be administered in an impartial, objective and balanced manner;
  • provide rigorous high quality analysis of any case for modification;
  • be cost-effective;
  • contain rules and processes that are sufficiently flexible to allow for efficient modification management; and
  • be delivered in a manner that avoids unnecessary regulatory burdens.

While the CACoP sets out the principles and processes which code administrators are committed to following, code administrators must comply with the relevant code and associated licences.

Where inconsistencies or conflicts exist between the relevant codes and the CACoP, the relevant code shall take precedence, though it is anticipated that - for those codes that are bound to adhere to the CACoP principles - licensees and other code parties will take all reasonable steps to ensure the two are aligned. 

For more information please see the CACoP website.

Industry code modifications

All open modifications to the codes are listed in the Central Modifications Register. The code administrators update this register every month. 

We publish our own industry code decisions and notices. 

Expected decision dates

The expected decision date is the date we plan to publish our decision on a proposed code modification. 

The expected decision date is an indicator only. These dates may change due to developments in a particular modification proposal or other changes in priorities. 

These tables are updated every month to reflect any expected decision date changes.

Balancing and Settlement Code

Elexon is the Code Administrator for the Balancing and Settlement Code.

There are no modifications to the BSC with us for decision this month. 

Connection and Use of System Code (CUSC)

The National Energy System Operator (NESO) is the organisation responsible for the Connection and Use of System Code. 

Modification reference number Modification title Lead team Final modification report received Expected date of decision  Ofgem expect to conduct an IA or consultation

CMP397 

 

 Consequential changes required to CUSC Exhibits B and D to reflect CMP316 (Co-Located Generation Sites)  Energy Systems Management and Security  12 June 2024  30 September 2025  No 

CMP315 

 

 TNUoS: Review of the expansion constant and the elements of the transmission system charged for  Systems and Networks  7 February 2024  TBC  Yes 

CMP375 

 

 Enduring Expansion Constant & Expansion Factor Review  Systems and Networks  7 February 2024  TBC  Yes 

CMP330 

 

 Allowing new Transmission Connected parties to build Connection Assets greater than 2km in length  Systems and Networks  10 August 2023  TBC   No 

CMP374 

 

 Extending contestability for Transmission Connections  Systems and Networks  10 August 2023  TBC   No 

CMP432

 

 Improve “Locational Onshore Security Factor” for TNUoS Wider Tariffs Energy Systems Management and Security  15 May 2025  30 September 2025  No 

CMP344 

 

 Clarification of Transmission Licensee revenue recovery and the treatment of revenue adjustments in the Charging Methodology  Electricity Transmission Charging   10 July 2025  31 October 2025  No 

Distribution Code (DC)

The Energy Networks Association is the body responsible for the Distribution Code.

There are no modifications to the Distribution Code with us for decision this month.

Distribution Connection and Use of System Code (DCUSA)

Electralink is the body responsible for the Distribution and Use of System Agreement. 

Modification Reference Number  Modification Title  Lead Team  Final Modification Report Received  Expected date of decision  Ofgem expect to conduct an IA or Consultation 
DCP446  Emergency Disconnections  Distribution and Residual Charging  17 April 2025  TBC  No
DCP412  Discounts from TCR charges for ‘peaky’ final demand customers  Distribution and Residual Charging  19 March 2025  TBC  No
DCP437  To Shorten the DUoS Pricing Notice Periods  Distribution and Residual Charging  16 June 2025  25 September 2025 No
DCP439 Backdating Tariff Changes  Energy Systems Management and Security  12 August 2025  3 October 2025  No

Grid Code (GC)

NESO is the body responsible for the Grid Code. 

Modification reference number Modification title Lead team Final modification report received Expected date of decision Ofgem expect to conduct an IA or consultation

GC0166 

 

 Introducing new Balancing Mechanism Parameters for Limited Duration Assets 

NESO Regulation 

 

 08 July 2025  31 October 2025  No 

Independent Gas Transporters Uniform Network Code (IGT UNC)

The Independent Gas Transporters’ (IGT) Uniform Network Code (UNC) is the body responsible for the Independent Gas Transporters Uniform Network Code. 

There are no modifications to the IGT UNC with us for decision this month. 

Retail Energy Code (REC)

The Retail Energy Code Company limited is the body responsible for the Retail Energy Code.

There are no modifications to the REC with us for decision this month. 

Smart Energy Code (SEC)

The Smart Energy Code Company houses the Smart Energy Code Administrator and Secretariat. SECCo is the body responsible for the Smart Energy Code. 

There are no modifications to the SEC with us for decision this month. 

Security and Quality of Supply Standard (SQSS)

NESO is the body responsible for the Security and Quality of Supply Standard. 

There are no modifications to the SQSS with us for decision this month.

System Operator Transmission Owner Code (STC)

NESO is the body responsible for the System Operator - Transmission Owner Code. 

Modification reference number Modification title Lead team Final modification report received Expected date of decision Ofgem expect to conduct an IA or consultation

CM078 

 

 STC change for CUSC Modification CMP328 - Connection Trigger Distribution Impact Assessment  Energy Systems Design and Development  7 June 2022  TBC   No 

Uniform Network Code (UNC)

The Joint Office of Gas Transporters is the body responsible for the Uniform Network Code. 

Modification reference number Modification title Lead team Final modification report received Expected date of decision Ofgem expect to conduct an IA or consultation

D0001 

 

 Hydrogen Blending: An NTS Transportation and Power Station Consumption Demonstration  Gas Systems and Operations  21 February 2025  TBC  No 

UNC0900 

 

 Amendment to the Gas Quality NTS Entry Specification at Biomethane System Entry Points  Gas Systems and Operations  20 June 2025  TBC  No 
UNC0884  Extending the PC4 Read Submission Window 

Retail Market Operations  

 

 21 August 2025  24 October 2025 No