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 (EDD) 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. 

Any EDD changes will be reflected when this table is updated every month.

Balancing and Settlement Code (BSC)

Code administrator: Elexon

Get more information on modifications to the Balancing and Settlement Code.

Modification reference number Modification title Lead team Final modification report received Expected decision date Ofgem expect to conduct an impact assessment or consultation
P466 BSC Section N ‘Clearing Invoicing and Payment Distribution and Residual Charging 15 Mar 2024 2 Dec 2024 No
P477 Introducing data protection provisions that facilitate processing of personal data under the Market-wide Half Hourly Settlement arrangements Market Wide Half Hourly Settlement 18 Oct 2024 27 Jan 2025 No
P476 Exemption from MHHS Requirements for SMS Supplier Qualification Market Wide Half Hourly Settlement 12 Aug 2024 29 Jan 2025 No
P472 ‘Amendment to provisions for Parties to bring claims against BSC Agents in BSC Section E’ Distribution and Residual Charging 16 Oct 2024 31 Jan 2025 No
P444 Compensation for Suppliers and Virtual Lead Parties for Virtual Lead Party actions in the Balancing Mechanism Wholesale Markets 11 Oct 2024 4 Apr 2025 No

Connection and Use of System Code (CUSC)

Code administrator: the National Energy System Operator (NESO) 

Get more information on modifications to the Connection and Use of System Code.

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

CMP316

 

TNUoS Arrangements for Co-located Generation Sites Electricity Transmission Charging 12 June 2024 24 Jan 2025 No

CMP397

 

Consequential changes required to CUSC Exhibits B and D to reflect CMP316 
(Co-Located Generation Sites)
Electricity Transmission Charging 12 June 2024


24 Jan 2025

 

No

CMP403

 

Introducing Competitively Appointed Transmission Owners and Transmission Service Providers (Section 14) Onshore Networks 11 June 2024 31 Jan 2025 No

CMP404

 

Introducing Competitively Appointed Transmission Owners and Transmission Service Providers (Section 11) Onshore Networks 11 June 2024 31 Jan 2025 No

CMP315

 

TNUoS: Review of the expansion constant and the elements of the transmission system charged for Systems and Networks  7 Feb 2024 7 Feb 2025 Yes

CMP375

 

Enduring Expansion Constant and Expansion Factor Review Systems and Networks 7 Feb 2024 7 Feb 2025 Yes

CMP436

 

Update CUSC arrangements to replace the Electricity Arbitration Association (EAA) with the London Court of International Arbitration (LCIA) (Non-Charging) Industry Codes 7 Aug 2024 12 Feb 2025 No

CMP437

 

Update CUSC arrangements to replace the Electricity Arbitration Association (EAA) with the London Court of International Arbitration (LCIA) (Charging) Industry Codes 7 Aug 2024 12 Feb 2025 No

CMP330

 

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

CMP374

 

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

Distribution Code (DC)

Code administrator: the Energy Networks Association (ENA)

Get more information on modifications to the Distribution Code.

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

DCRP/24/01

 

Minor technical modifications to EREC G98 and G99   7 Oct 2024 29 Jan 2025 No

Distribution Connection and Use of System Code (DCUSA)

Code administrator: Electralink

Get more information on modifications to the Distribution and Use of System Agreement

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

DCP441

 

Proposal to increase the number of allowed Change Report alternative variations from 2 to 3 Industry Codes 18 Jul 2024 6 Dec 2024 No

DCP439

 

Backdating Tariff Changes Distribution and Residual Charging 18 Sept 2024 13 Feb 2025  No

Grid Code (GC)

Code administrator: the National Energy System Operator (NESO)

Get more information on modifications to the Grid Code

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

GC0172

 

Replacing References to Electricity Supply Industry Arbitration Association Industry Codes 7 Aug 2024 12 Feb 2025 No

GC0117

 

Improving transparency and consistency of access arrangements across Great Britain by the creation of a pan-Great Britain commonality of PGM requirements Networks and Systems 14 May 2024 TBC Yes

Retail Energy Code (REC)

Code administrator: the Retail Energy Code Company

Get more information on modifications to the Retail Energy Code.

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

Smart Energy Code (SEC)

Code administrator: the Smart Energy Code Company 

Get more information on modifications to the Smart Energy Code.

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

SECMP219

 

Accessing Consumption Data on behalf of SEC Parties Energy Systems Design and Development 4 July 2024 29 Nov 2024 No

System Operator Transmission Owner Code (STC)

Code administrator: the National Energy System Operator (NESO) 

Get more information on modifications to the System Operator Transmission Owner Code

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

CM0086

 

Introducing Competitively Appointed Transmission Owners and Transmission Service Providers Onshore Networks 11 Mar 2024 31 Jan 2025 No

CM0087

 

Introducing Connections Process to facilitate Competitively Appointed Transmission Owners Onshore Networks 11 Mar 2024 31 Jan 2025 No

CM0098

 

Updating STC Arrangements to replacing the Electricity Arbitration Association with the London Court of International Arbitration Industry Codes 7 Aug 2024 12 Feb 2025 No

CM0078

 

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

Independent Gas Transporters Uniform Network Code (IGT UNC)

Code administrator: Independent Gas Transporters Uniform Network Code 

Get more information on modifications to the Independent Gas Transporters Uniform Network Code.

There are no live modifications to the Independent Gas Transporters Uniform Network Code with us for decision this month.

Uniform Network Code (UNC)

Code administrator: the Joint Office of Gas Transporters 

Get more information on modifications to the Uniform Network Code

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

UNC862

 

Amendments to the current Unidentified Gas Reconciliation Period arrangements

 

Retail Market Operations 20 Sept 2024 29 Nov 2024  No

UNC860

 

Clarify impact of exit capacity holdings on offtake rights Gas Systems and Operations 20 Sept 2024 6 Jan 2025 No

UNC891  

 

Reintroduction of the enhanced pressure service and increased MNEPOR for BBLC (reintroduced by UNC0859 and introduced by UNC0814) Gas Security and Flexibility 20 Sept 2024 TBC No