Energy code timetable

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.

This page is updated at the end of each calendar month. 

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.

Decision date

P487: Incentive of BSC Supplier Parties to meet the M15 MHHS Milestone.
Decision date: to be announced

P497: Enabling publishing of REMIT data directly to Elexon and replacing NESO’s Market Operation Data Interface System (MODIS) as a submission method
Decision date: 27 February 2026 

Carbon Capture and Storage Network Code (CCS N Code)

The CCS (Carbon Capture and Storage) Network Code body manages the CCS N Code.

Decision date

There are no modifications to the CCS N Code with us for decision. 

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. 

Decision date

CMP344: Clarification of Transmission Licensee revenue recovery and the treatment of revenue adjustments in the Charging Methodology 
Decision date: 27 February 2026

CMP397: Consequential changes required to CUSC Exhibits B and D to reflect CMP316 (Co-Located Generation Sites) 
Decision date: 27 February 2026 

CMP315: TNUoS: Review of the expansion constant and the elements of the transmission system charged for 
Decision date: to be announced

CMP375: Enduring Expansion Constant & Expansion Factor Review 
Decision date: to be announced

CMP330: Allowing new Transmission Connected parties to build Connection Assets greater than 2km in length 
Decision date: To be announced. 

CMP374: Extending contestability for Transmission Connections 
Decision date: To be announced. 

CMP316: TNUoS Arrangements for Co-located Generation Sites 
Decision date: 27 February 2026 

CMP453: To Bill BSUoS on a net basis at BSC Trading Units 
Decision date: 30 September 2026

CMP423: Generated Weighted Nodes
Decision date: to be announced  

Distribution Code (DCode)

The Energy Networks Association is the body responsible for the Distribution Code.

Decision date

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. 

Decision date

DCP412: Discounts from TCR charges for ‘peaky’ final demand customers 
Decision date: to be announced 

Grid Code (GC)

NESO is the body responsible for the Grid Code.

Decision date

GC0169: Material changes arising from Grid Code Modification GC0136 
Decision date: 31 March 2026 

GC0173: Consistency of Technical and Compliance Requirements between GB and European Users
Decision date: 31 March 2026 

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.

Decision date

IGT165: Independent Shrinkage Expert and Independent Shrinkage Charge - IGT UNC 
Decision date: 27 February 2026  

Retail Energy Code (REC)

The Retail Energy Code Company limited is the body responsible for the Retail Energy Code.

Decision date

R0287 and R0287A: Clarification and Amendments to Annulment Definition in Schedule 23 – Alignment with SLC Obligations (Alternate)
Decision date: 20 February 2026 

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.

Decision date

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. 

Decision date

GSR034: Review of Loss of Power Infeed Risk for Offshore DC Converter
Decision date: 27 February 2026

System Operator Transmission Owner Code (STC)

NESO is the body responsible for the System Operator - Transmission Owner Code.

Decision date

CM078: STC change for CUSC Modification CMP328 - Connection Trigger Distribution Impact Assessment 
Decision date: to be announced

Uniform Network Code (UNC)

The Joint Office of Gas Transporters is the body responsible for the Uniform Network Code. 

Decision date

UNC0843: Establishing the Independent Shrinkage Charge and the Independent Shrinkage Expert | Joint Office of Gas Transporters - Gas Governance 
Decision date: 27 February 2026   

UNC0900: Amendment to the Gas Quality NTS Entry Specification at Biomethane System Entry Points 
Decision date: to be announced 

UNC0903: The Introduction of a Single NTS Capacity Reference Price 
Decision date: 14 of December 2026   

UNC0894/A: Facilitating Biomethane entry into the GDN by exporting methane from the GDN into the NTS via Compression
Decision date: to be announced