Change Consultations
This page lists all Change Consultations which are opened when we need to obtain feedback from the industry on potential Modifications, Change Proposals and Issues. The page also includes Change Consultations which have ceased to be active as they have reached their closed date.
Please note that we publish Change Proposal Consultations (CPCs) when communicating consultations for Change Proposals. Change Proposal Consultations highlight change information and Impact Assessment responses.
List of Change Consultations
Call for evidence on P462: the removal of subsidies from Bid Prices in the Balancing Mechanism
CEPA and Elexon have issued a Call for Evidence to gather stakeholder views on the potential benefits, costs and other impacts of implementing P462 The removal of subsidies from Bid Prices in the Balancing Mechanism.
P488 Report Phase Consultation of Aligning the BM Unit Rules for EII Assets in the BSC
This Modification proposed the removal of Section K3.1.2A from the BSC to reflect how Exemptions for Electricity-Intensive Industries (EII) are applied in practice. The current Department for Business and Trade (DBT) led process already accounts for mixed asset configurations within BM Units, rendering this BSC restriction outdated. With no industry impacts, low implementation costs, and alignment with operational and policy intent, this change will simplify the Code and remove a point of potential non-compliance.
Issue 115 Request for Information: Asset Metering Registration Process Consultation
We are gathering views on the API solution development proposed in Issue 115. We are evaluating enhancements to the Customer Solution’s Asset Metering System ID (AMSID) registration process. The efficiency of the current three-stage manual validation process involving website/CSV upload is being assessed, and the potential for API automation is under consideration. Your input is requested on the current process costs, API implementation benefits and challenges, and overall value. Please refer to the Issue proposal form below for further details.
P487 Report Phase Consultation Incentive of BSC Supplier Parties to meet the M15 MHHS Milestone
Under the MHHS Programme there is currently an incentive for Suppliers to become qualified to participate in the new arrangements by Milestone 14. This Modification seeks to replicate that incentive for Milestone 15. This proposal aims to incentivise Suppliers to meet the MHHS Migration Plan by restricting their ability to register new Metering Systems if they fail to complete migration on time.
P483 Report Phase Consultation Enabling Asset Metering for Non-Half Hourly Boundary Metering Systems
This Modification seeks to address this issue by removing the Half-Hourly settlement requirement for associated Boundary Point Metering Systems. Doing so will expand access to flexibility markets for domestic consumers, support equitable participation in energy services, and reduce the dependency on Market-wide Half-Hourly Settlement (MHHS) for consumer inclusion. This change is expected to enable flexible asset participation and support energy system goals such as Clean Power 2030.
P486 ‘Aligning BSC Terminology with the Terminology Introduced by P478’ Report Phase Consultation
This Modification proposes to clarify the meaning of the term Half-Hourly Metering System(s), a new definition used in the Modification P478 ‘Implementation of MHHS Arrangements’ Legal Text. This will clarify where the new usage is equivalent to the current definition and where it is distinct, to avoid ambiguity or unintended consequences throughout the BSC.
Request for Information: ISD data accuracy prior to MHHS Milestone M10
In order to finalise the preparations for the Market-Wide Half-Hourly Settlement (MHHS) Milestone M10, scheduled for September 2025, Elexon is issuing this Request for Information (RFI) to gather further insights and confirm the accuracy of the collated ISD data by the collaborative efforts of MHHS, Elexon, and LDSOs.
The purpose of this RFI is to identify any potential discrepancies and ensure that all required adjustments are made prior to the ISD data migration.
Elexon will collate all feedback and respond to changes where required. The changes will be presented at the Supplier Volume Allocation Group (SVG) committee for approval in readiness for MHHSP ISD Data Migration
P483 Assessment Procedure Consultation
This Modification seeks to address this issue by removing the Half-Hourly settlement requirement for associated Boundary Point Metering Systems. Doing so will expand access to flexibility markets for domestic consumers, support equitable participation in energy services, and reduce the dependency on Market-wide Half-Hourly Settlement (MHHS) for consumer inclusion. This change is expected to enable flexible asset participation and support energy system goals such as Clean Power 2030.
Consultation on P485 Stabilise TLFs for BSC Year 2025/26 at 2024/25 levels
This Urgent Modification proposes that, until the BSC Panel’s determination that 2025/26’s Transmission Loss Factors (TLFs) reflect expected changes in variable losses due to marginal demand or generation changes as anticipated when BSC Modification P350 was approved, TLFs from the 2024–25 BSC Year will apply to the 2025-26 BSC Year from the P485 Implementation Date.
The Panel must decide what TLF values, the ‘corrected values’, to apply. The Panel are consulting on two solution options. Under the Proposed, the ‘corrected values’ will be applied from 1 April 2025. Under the Alternative solution, the ‘corrected values’ will apply from the BSC Season following the Panel determination.
Consultation on P484 Amending BSC Metering Obligations for CfD Assets
This Modification aims to align BSC rules with evolving CfD arrangements by introducing greater flexibility in how assets are registered within BM Units. By simplifying administrative processes and supporting efficient energy management, this change helps market participants optimise their operations while ensuring continued compliance with the BSC. Additionally, it reflects ongoing developments in Government policy, allowing for a more adaptable and streamlined approach to CfD asset management.