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 |