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)
Code administrator: Elexon
Get more information on modifications to 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 |
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)
Code administrator: the National Energy System Operator (NESO)
Get more information on modifications to the Connection and Use of System Code.
Modification reference number |
Modification title |
Lead team |
Final modification report received |
Expected decision date |
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)
Code administrator: the Energy Networks Association (ENA)
Get more information on modifications to the Distribution Code.
Modification reference number |
Modification title |
Lead team |
Final modification report received |
Expected decision date |
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)
Code administrator: Electralink
Get more information on modifications to the Distribution and Use of System Agreement.
Modification reference number |
Modification title |
Lead team |
Final modification report received |
Expected decision date |
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)
Code administrator: the National Energy System Operator (NESO)
Get more information on modifications to the Grid Code.
Modification reference number |
Modification title |
Lead team |
Final modification report received |
Expected decision date |
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)
Code administrator: the Retail Energy Code Company
Get more information on modifications to the Retail Energy Code.
There are no modifications to the Retail Energy Code with us for decision this month.
Smart Energy Code (SEC)
Code administrator: the Smart Energy Code Company
Get more information on modifications to the Smart Energy Code.
Modification reference number |
Modification title |
Lead team |
Final modification report received |
Expected decision date |
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)
Code administrator: the National Energy System Operator (NESO)
Get more information on modifications to the System Operator Transmission Owner Code.
Modification reference number |
Modification title |
Lead team |
Final modification report received |
Expected decision date |
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 |
Independent Gas Transporters Uniform Network Code (IGT UNC)
Code administrator: Independent Gas Transporters Uniform Network Code
Get more information on modifications to the Independent Gas Transporters Uniform Network Code.
There are no live modifications to the Independent Gas Transporters Uniform Network Code with us for decision this month.
Uniform Network Code (UNC)
Code administrator: the Joint Office of Gas Transporters
Get more information on modifications to the Uniform Network Code.
Modification reference number |
Modification title |
Lead team |
Final modification report received |
Expected decision date |
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 UNC0859 and introduced by UNC0814) |
Gas Security and Flexibility |
20 Sept 2024 |
TBC |
No |