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)

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 impact assessment or consultation
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 October 2024 27 January 2025 No
P476 Exemption from MHHS requirements for SMS supplier qualification Market Wide Half Hourly Settlement 12 August 2024 29 January 2025 No
P472 ‘Amendment to provisions for parties to bring claims against BSC agents in BSC section E’ Distribution and Residual Charging 16 October 2024 31 January 2025 No
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 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 31 January 2025 No
CMP404 Introducing competitively appointed transmission owners and transmission service providers (section 11) Onshore Networks 11 June 2024 31 January 2025 No
CMP315 TNUoS: Review of the expansion constant and the elements of the transmission system charged for Systems and Networks  7 February 2024 7 February 2025 Yes

CMP375

 

Enduring expansion constant and expansion factor review Systems and Networks 7 February 2024 7 February 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 August 2024 12 February 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 August 2024 12 February 2025 No
CMP330 Allowing new transmission connected parties to build connection assets greater than 2 kilometres 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) Electricity Transmission Charging 12 June 2024 TBC No
CMP441 Reducing the credit risk of supplying non-embedded hydrogen electrolysers Distribution and Residual Charging 20 December 2024 TBC No

Distribution Code (DC)

The Energy Networks Association is responsible for the Distribution Code. 

Modification Reference Number Modification Title Lead Team Final Modification Report Received Expected date of decision Ofgem expect to conduct an IA or Consultation
DCRP/24/01 Minor technical modifications to EREC G98 and G99   7 October 2024 14 February 2025 No

Distribution Connection and Use of System Code (DCUSA)

Electralink is 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 13 February 2025 No

Grid Code (GC)

The National Energy System Operator (NESO) is 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 31 January 2025 No
GC0172 Replacing references to electricity supply industry arbitration association Industry Codes 7 August 2024 12 February 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 25 March 2025 Yes

Retail Energy Code (REC)

The Retail Energy Code Company limited is 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
R0173 Improvements to the Theft Detection Incentive Scheme Retail Pricing and Systems 4 December 2024 3 March 2025 No
R0137 Introducing third party intermediary (energy broker) assurance and accreditation Consumer Protection and Retail Markets 4 December 2024 31 March 2025 No
R0155 Change of tenancy: evidentiary standards and timescales Consumer Protection and Retail Markets 18 December 2024 TBC No

Smart Energy Code (SEC)

The Smart Energy Code Company houses the Smart Energy Code Administrator and Secretariat. SECCo is responsible for the Smart Energy Code.

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

System Operator Transmission Owner Code (STC)

The National Energy System Operator (NESO) is 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 31 January 2025 No
CM0087   Introducing connections process to facilitate competitively appointed transmission owners Onshore Networks 11 March 2024 31 January 2025 No
CM0098   Updating STC arrangements to replacing the Electricity Arbitration Association with the London Court of International Arbitration Industry Codes 7 August 2024 12 February 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)

Independent Gas Transporters Uniform Network Code (IGT UNC) is code administrator for the Independent Gas Transporters Uniform Network Code.

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

Uniform Network Code (UNC)

The Joint Office of Gas Transporters is 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
UNC868 Change to the current allocation of unidentified gas statement frequency and scope Retail Market Operations 19 December 2024 17 January 2025 No
UNC860   Clarify impact of exit capacity holdings on offtake rights Gas Systems and Operations 20 September 2024 31 January 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 September 2024 14 February 2025 No