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.

The codes

The table below lists the industry codes and their administrators.

The Code Administrators have developed a Central Modifications Register which details all current modifications across the codes. This spreadsheet is managed by the Code Administrators and updated by them monthly.

We publish our decisions relevant to each code in Industry code publications: code decisions and notices

Code Type Code Administrator Website
Balancing and Settlement Code (BSC) Electricity Elexon https://bscdocs.elexon.co.uk/
Connection Use of System Code (CUSC) Electricity National Energy System Operator https://www.neso.energy/industry-information/codes/connection-and-use-system-code-cusc
Distribution Use of System Agreement (DCUSA) Electricity Electralink https://www.dcusa.co.uk/dcusa-document/
Grid Code Electricity National Energy System Operator https://www.neso.energy/industry-information/codes/grid-code-gc/grid-code-documents
Distribution Code Electricity Energy Networks Association www.dcode.org.uk
System Operator - Transmission Operator Code (STC) Electricity National Energy System Operator https://www.neso.energy/industry-information/codes/system-operator-transmission-owner-code-stc/stc-code-documents
Uniform Network Code (UNC) Gas Joint Office of Gas Transporters https://www.gasgovernance.co.uk/UNC
Independent Gas Transporter UNC (IGT UNC) Gas Gemserv https://www.igt-unc.co.uk/igt-unc-related-documents/
Smart Energy Code (SEC) Gas and Electricity SECAS https://smartenergycodecompany.co.uk/the-smart-energy-code/
Retail Energy Code (REC) Gas and Electricity REC https://recportal.co.uk/the-rec-codes

In addition to the codes

  • Distribution Network Operators are required to provide a Data Transfer Service (DTS) to facilitate the electronic transfer of certain industry data - for more information see the Electralink DTS website
  • Xoserve Limited provides a range of services to support the GB gas industry, for example billing services and managing and booking of capacity. Further information on the services is available on the Xoserve website.
  • Following Retail Code Consolidation, on 1 September the Master Registration Agreement, Supply Point Administration Agreement, Green Deal Arrangements Agreement, and Smart Meter Installation Code of Practice were consolidated into the Retail Energy Code.

Expected decision dates

This table provides the Expected decision date (EDD), or the date we intend to publish an impact assessment or consultation, for code modifications or proposals that are with us for decision. The table also identifies the responsible Ofgem team.

Documents relating to each code modification or proposal are available on the relevant code website listed above.

The dates set out in the final column of the table (Expected date of decision) reflect our expectations as of the date this version of the table is published. These dates may change (for example, due to developments in respect of a particular modification proposal or due to other changes in priorities). Any changes in Ofgem’s expectations will be reflected in updated versions of this table, which will be regularly published on our website.

Balancing and Settlement Code (BSC)

Modification reference number Modification title Lead team Final modification report received Expected date of decision 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)

Modification reference number Modification title Lead team Final modification report received Expected date of decision 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)

Modification reference number Modification title Lead team Final modification report received Expected date of decision 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)

Modification reference number Modification title Lead team Final modification report received Expected date of decision 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)

Modification reference number Modification title Lead team Final modification report received Expected date of decision 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)

Ofgem is not publishing any code modification decisions for the REC this month.

Smart Energy Code (SEC)

Modification reference number Modification title Lead team Final modification report received Expected date of decision 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)

Modification reference number Modification title Lead team Final modification report received Expected date of decision 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

Uniform Network Code (UNC)

Modification reference number Modification title Lead team Final modification report received Expected date of decision 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 UNC0589 and introduced by UNC0814) Gas Security and Flexibility 20 Sept 2024 TBC No