Industry codes and standards

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.

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 (BSC)

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

CMP441 

 

Reducing the credit risk of supplying non-embedded hydrogen Electrolysers  Distribution and Residual Charging 

20 December 2024 

 

30 April 2025  No 

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 

CMP418 

 

Refine the allocation of Dynamic Reactive Compensation Equipment (DRCE) costs at OFTO transfer  Transmission Charging  12 March 2025  TBC  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

DCP412 

 

Discounts from TCR charges for ‘peaky’ final demand customers  Distribution and Residual Charging  19 March 2025  TBC  No 

DCP446 

 

Emergency Disconnections  Distribution and Residual Charging  17 April 2025  TBC  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

GC0117 

 

Improving transparency and consistency of access arrangements across GB by the creation of a pan-GB commonality of PGM requirements  Networks and Systems  14 May 2024  30 May 2025  Yes 

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

Modification Reference Number Modification Title Lead Team Final Modification Report Received Expected date of decision Ofgem expect to conduct an IA or Consultation

R0137A 

 

Introducing Third Party Intermediary (energy broker) assurance and accreditation  Consumer Protection and Retail Markets  4 December 2024  16 May 2025  No 

R0207 

 

R0207 Import / Export MOA Charging Clarification  Retail Pricing and Systems  13 March 2025  TBC  No 

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

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

SEC MP271 

 

Sub-Committee seats for Other Users, Meter Data Retrievers and Registered Supplier Agents  Industry Codes  27 January 2025   16 May 2025  No 

SEC MP219 

 

Accessing Consumption Data on behalf of SEC Parties  Energy Systems Design and Development  26 March 2025  16 May 2025  No 

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 

UNC900 

 

Amendment to the Gas Quality NTS Entry Specification at Biomethane System Entry Points  Gas Systems and Operations  22 April 2025  TBC  No