| Retail energy code |
R0241: MHHS (market-wide half-hourly settlement) incremental changes for go live |
Consumer protection and retail market |
16 July 2025 |
7 August 2025 |
No |
| Smart energy code |
SEC MP286: Establishment of the privacy sub committee into the SEC |
Industry codes |
22 May 2025 |
5 August 2025 |
No |
| Balancing and settlement code |
P487: Incentive of BSC supplier parties to meet the M15 MHHS milestone |
Consumer protection and retail market |
17 June 2025 |
28 August 2025 |
No |
| Balancing and settlement code |
P488: Aligning the BM (balancing mechanism) unit rules for EII (electricity-intensive industry) assets in the BSC |
Distribution charging and non-domestic retail |
2 July 2025 |
8 August 2025 |
No |
| Connection and use of system code |
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 |
| Connection and use of system code |
CMP315: TNUoS (transmission network use of system) review of the expansion constant and the elements of the transmission system charged for |
Systems and networks |
7 February 2024 |
To be confirmed |
Yes |
| Connection and use of system code |
CMP375: Enduring expansion constant and expansion factor review |
Systems and networks |
7 February 2024 |
To be confirmed |
Yes |
| Connection and use of system code |
CMP330: Allowing new transmission connected parties to build connection assets together |
Systems and networks |
10 August 2023 |
To be confirmed |
Yes |
| Connection and use of system code |
CMP374: Extending contestability for transmission connections |
Systems and networks |
10 August 2023 |
To be confirmed |
No |
| Connection and use of system code |
CMP418: Refine the allocation of dynamic reactive compensation equipment costs at OFTO transfer |
Transmission charging |
12 March 2025 |
31 July 2025 |
No |
| Connection and use of system code |
CMP450: Introducing the definition of dynamic reactive compensation equipment in the CUSC |
Transmission charging |
15 May 2025 |
31 July 2025 |
No |
| Distribution connection and use of system code |
DCP446: Emergency disconnections |
Distribution and residual charging |
17 April 2025 |
3 September 2025 |
|
| Distribution connection and use of system code |
DCP412: Discounts from TCR (targeted charging review) charges for 'peaky' final demand customers |
Distribution and Residual Charging |
19 March 2025 |
To be confirmed |
No |
| Distribution connection and use of system code |
DCP437: To shorten the DUoS (distribution use of system) pricing notice periods |
Distribution residual charging
|
16 June 2025 |
28 August 2025 |
No |
| Distribution connection and use of system code |
DCP440: Consuming 'de-energised' sites |
Retail market operations |
16 June 2025 |
22 August 2025 |
No |
| Uniform network code |
D0001: Hydrogen blending. An NTS (national transmission system) transportation and power station consumption demonstration |
Gas systems and operations |
21 February 2025 |
To be confirmed |
No |
| Uniform network code |
UNC0900: Amendment to the gas quality NTS entry specification at biomethane system entry points |
Gas Systems and Operations |
22 April 2025 |
To be confirmed |
No |
| Uniform network code |
UNC0887: Facilitating bi-directional connections between IGT (independent gas transporter) pipelines and the NTS |
Gas Systems and Operations
|
20 June 2025 |
19 August 2025 |
No |
| Uniform network code |
UNC0886V: Amend the code cut-off date to a rolling period. Joint Office of Gas Transporters - gas governance |
Retail Market Operations |
22 July 2025 |
22 August 2025 |
No |
| Grid code |
GC0166: Introducing new balancing mechanism parameters for limited duration assets |
ESO regulation
|
08 July 2025 |
31 October 2025 |
No |
| System operator transmission owner code |
CM078: STC change for CUSC modification CMP328 - connection trigger distribution impact assessment |
Energy systems design and development |
7 June 2022 |
To be confirmed |
No |
