Energy codes can be changed or updated, for example to remove specific requirements.
We approve or reject energy code modifications. The outcome and reason for each change is published in the list of Energy code publications.
You can get further information on proposed changes to energy codes on the Code Administration Code of Practice website.
Energy code proposed changes
Proposed changes to energy codes that we are reviewing and dates we aim to decide the outcome.
Balancing and Settlement Code (BSC)
Elexon is the Code Administrator for the Balancing and Settlement Code.
There are no modifications to the BSC with us for decision.
Carbon Capture and Storage Network Code (CCS N Code)
The CCS (Carbon Capture and Storage) Network Code body manages the CCS N Code.
| Modification reference number |
Modification title |
Expected date of decision |
Ofgem expect to conduct an IA or consultation |
|
CCS001
|
Clarification of CO2 Venting between Metering Point and Delivery Point |
TBC |
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 |
Expected date of decision |
Ofgem expect to conduct an IA or consultation |
|
CMP397
|
Consequential changes required to CUSC Exhibits B and D to reflect CMP316 (Co-Located Generation Sites) |
30 September 2025 |
No |
|
CMP315
|
TNUoS: Review of the expansion constant and the elements of the transmission system charged for |
TBC |
Yes |
|
CMP375
|
Enduring Expansion Constant & Expansion Factor Review |
TBC |
Yes |
|
CMP330
|
Allowing new Transmission Connected parties to build Connection Assets greater than 2km in length |
TBC |
No |
|
CMP374
|
Extending contestability for Transmission Connections |
TBC |
No |
|
CMP432
|
Improve “Locational Onshore Security Factor” for TNUoS Wider Tariffs |
6 October 2025 |
No |
|
CMP344
|
Clarification of Transmission Licensee revenue recovery and the treatment of revenue adjustments in the Charging Methodology |
31 October 2025 |
No |
| CMP316 |
TNUoS Arrangements for Colocated Generation Sites |
TBC |
No |
Distribution Code (DCode)
The Energy Networks Association is the body responsible for the Distribution Code.
There are no modifications to the Distribution Code with us for decision.
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 |
Expected date of decision |
Ofgem expect to conduct an IA or Consultation |
| DCP446 |
Emergency Disconnections |
14 November 2025 |
No |
| DCP412 |
Discounts from TCR charges for ‘peaky’ final demand customers |
TBC |
No |
| DCP437 |
To Shorten the DUoS Pricing Notice Periods |
10 October 2025 |
No |
| DCP439 |
Backdating Tariff Changes |
6 October 2025 |
No |
Grid Code (GC)
NESO is the body responsible for the Grid Code.
| Modification reference number |
Modification title |
Expected date of decision |
Ofgem expect to conduct an IA or consultation |
|
GC0166
|
Introducing new Balancing Mechanism Parameters for Limited Duration Assets |
31 October 2025 |
No |
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.
| Modification reference number |
Modification title |
Expected date of decision |
Ofgem expect to conduct an IA or consultation |
|
IGT176
|
Changes to IGT UNC to enable UNC0887 ‘Facilitating Bi-Directional Connections Between IGT Pipelines and the NTS’ - IGT UNC |
30 November 2025 |
No |
| IGT165 |
Independent Shrinkage Expert and Independent Shrinkage Charge - IGT UNC |
TBC |
No |
Retail Energy Code (REC)
The Retail Energy Code Company limited is the body responsible for the Retail Energy Code.
| Modification reference number |
Modification title |
Expected date of decision |
Ofgem expect to conduct an IA or consultation |
|
R0216
|
REC Changes to tie in with DCP419 |
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.
There are no modifications to the SEC with us for decision.
Security and Quality of Supply Standard (SQSS)
NESO is the body responsible for the Security and Quality of Supply Standard.
There are no modifications to the SQSS with us for decision.
System Operator Transmission Owner Code (STC)
NESO is the body responsible for the System Operator - Transmission Owner Code.
| Modification reference number |
Modification title |
Expected date of decision |
Ofgem expect to conduct an IA or consultation |
|
CM078
|
STC change for CUSC Modification CMP328 - Connection Trigger Distribution Impact Assessment |
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 |
Expected date of decision |
Ofgem expect to conduct an IA or consultation |
|
UNC0900
|
Amendment to the Gas Quality NTS Entry Specification at Biomethane System Entry Points
|
TBC
|
No
|
|
UNC0884
|
Extending the PC4 Read Submission Window
|
28 October 2025
|
No
|
|
UNC483
|
Establishing the Independent Shrinkage Charge and the Independent Shrinkage Expert | Joint Office of Gas Transporters - Gas Governance
|
TBC |
No
|
