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.

Modification reference number  Modification Title  Lead team  Final modification report received  Expected decision date Ofgem expect to conduct an IA or consultation 
P444  Compensation for Suppliers and Virtual Lead Parties for Virtual Lead Party actions in the Balancing Mechanism  Wholesale Markets  11 October 2024  4 April 2025  No 

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

CMP403

 

Introducing Competitively Appointed Transmission Owners and Transmission Service Providers (Section 14) Onshore Networks 11 June 2024 By end of March 2025 No

CMP404

 

Introducing Competitively Appointed Transmission Owners and Transmission Service Providers (Section 11) Onshore Networks 11 June 2024 By end of March 2025 No

CMP441

 

Reducing the credit risk of supplying non-embedded hydrogen Electrolysers Distribution and Residual Charging 20 December 2024 30 April 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

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

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

DCP439

 

Backdating Tariff Changes Distribution and Residual Charging 18 September 2024 2 April 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

GC0159

 

Introducing Competitively Appointed Transmission Owners Onshore Networks 31 December 2024 By end of March 2025 No

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 7 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 TBC 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  1 May 2025  No 

Security and Quality of Supply Standard (SQSS)

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

Modifications for the SQSS will begin to be published commencing in April 2025.

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

CM0086 

 

Introducing Competitively Appointed Transmission Owners and Transmission Service

Providers

Onshore Networks 11 March 2024 By end of March 2025 No

CM0087 

 

Introducing Connections Process to facilitate Competitively Appointed

Transmission Owners

Onshore Networks 11 March 2024 By end of March 2025 No

CM0078

 

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