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 Ofgem expect to conduct an impact assessment or consultation Expected date of decision
P481    Enable Elexon to be the Market Facilitator Delivery Body Energy Systems Design and Development 16 Oct 2024 No 4 Nov 2024
P466

BSC Section N ‘Clearing Invoicing and Payment

 

Distribution & Residual Charging 15 Mar 2024 No 25 Nov 2024
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 No 27 Jan 2025
P476 Exemption from MHHS Requirements for SMS Supplier Qualification Market Wide Half Hourly Settlement 12 Aug 2024 No 29 Jan 2025
P472 ‘Amendment to provisions for Parties to bring claims against BSC Agents in BSC Section E’ Distribution and Residual Charging 16 Oct 2024 No 31 Jan 2025
P444 Compensation for Suppliers and Virtual Lead Parties for Virtual Lead Party actions in the Balancing Mechanism

Wholesale Markets

 

11 Oct 2024 No 4 Apr 2025

Connection and Use of System Code (CUSC)

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

CMP408

 

Allowing consideration of a different notice period for BSUoS tariff settings Electricity Transmission Charging 13 Oct 2023 No 30 Oct 2024

CMP415

 

Amending the Fixed Price Period from 6 to 12 months Electricity Transmission Charging 13 Oct 2023 No

30 Oct 2024

 

CMP316

 

TNUoS Arrangements for Co-located Generation Sites Electricity Transmission Charging 12 June 2024 No 29 Nov 2024 

CMP397

 

Consequential changes required to CUSC Exhibits B and D to reflect CMP316 (Co-Located Generation Sites) Electricity Transmission Charging 12 June 2024 No 29 Nov 2024

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 No 6 Dec 2024

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 No 6 Dec 2024

CMP403

 

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

CMP404

 

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

CMP315

 

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

CMP375

 

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

CMP330

 

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

CMP374

 

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

Distribution Connection and Use of System Code (DCUSA)

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

DCP433

 

Limitation for backdating of rebates/charges under Schedule 32 Distribution & Residual Charging 10 June 2024 No 14 Nov 2024

DCP438

 

Rate of Return Change Proposal Distribution & Residual Charging 15 Jul 2024 No 14 Nov 2024 

DCP417

 

Ability for the DCUSA Secretariat to Raise Change Proposals Industry Codes 11 June 2024 No 19 Nov 2024

DCP437

 

To Shorten the DUoS Pricing Notice Periods Distribution & Residual Charging 10 Oct 2024 No 21 Nov 2024

DCP441

 

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

DCP439

 

Backdating Tariff Changes Distribution and Residual Charging 18 Sept 2024 No 6 Dec 2024

Grid Code (GC)

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

GC0172

 

Replacing References to Electricity Supply Industry Arbitration Association Industry Codes 7 Aug 2024 No 6 Dec 2024

GC0117

 

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

Retail Energy Code (REC)

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

R0170  

 

Withdrawal of Service Termination Issue Reporting Guidance (STIRG) from REC Governance Retail Market Operations 18 Sept 2024 No 15 Nov 2024

R0182

 

Levelisation reconciliation electricity single rate/multi-register split Consumer Protection and Retail Markets 16 Oct 2024 No 15 Nov 2024

Smart Energy Code (SEC)

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

SECMP224

 

SEC Performance Assurance Framework Industry Codes 27 June 2024 No 7 Nov 2024

SECMP219  

 

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

System Operator Transmission Owner Code (STC)

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

CM0085

 

To Clarify OFTO reactive power requirements at <20% output Offshore Transmission 11 Mar 2024 No 1 Nov 2024

CM0098  

 

Updating STC Arrangements to replacing the Electricity Arbitration Association with the London Court of International Arbitration Industry Codes 7 Aug 2024 No 6 Dec 2024

CM0086  

 

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

CM0087  

 

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

CM0078

 

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

Uniform Network Code (UNC)

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

UNC860  

 

Clarify impact of exit capacity holdings on offtake rights

 

Gas Systems and Operations 20 Sept 2024 No 15 Nov 2024

UNC862  

 

Amendments to the current Unidentified Gas Reconciliation Period arrangements Retail Market Operations 20 Sept 2024 No 29 Nov 2024 

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 No TBC