List of all BSC Modifications
These pages list all Modifications issued since 2001. Modifications are raised to introduce changes that would alter any part of the BSC or any Code Subsidiary Documents (CSDs) or BSC Systems impacted by the proposed changes.
P490 Introduction of three new BSC Agents to provide the SVAA Service
Using the powers granted to BSCCo by approved Modification P482 ‘Allow Elexon to more flexibly split BSC Agent services and to put in place appropriate contracts for the delivery of MHHS’ , BSCCo proposes to introduce three new BSC Agents to provide the Supplier Volume Allocation Agent (SVAA) service.
P489 Update approved P478 for alignment with the latest MHHS Design
This Modification seeks to update the amended Balancing and Settlement (BSC) Sections, new and existing BSC Code Subsidiary Documents (CSDs) and BSC owned Energy Market Data Specification (EMDS) items approved for P478 to reflect the latest MHHS Design.
P488 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Trade (DBT) led process already accounts for mixed asset configurations within BM Units, rendering this BSC restriction outdated.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.
P487 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.
P486 Aligning BSC Terminology with the Terminology Introduced by P478
This Modification proposes to clarify the meaning of the term Half-Hourly Metering System(s), a new definition used in the P478 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.
P485 Stabilise TLFs for BSC Year 2025/26 at 2024/25 levels
This Modification seeks to stabilise the locational signal provided by TLFs for 2025/26 by temporarily freezing the current 2024/25 values until the significant variation can be better understood. This aims to protects users, and ultimately the end consumer, from the unpredictability and uncertainty that the change would introduce from the 1st of April 2025.
P484 Amending BSC Metering Obligations for CfD Assets
This Modification aligned the 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.
P483 Enabling Asset Metering for Non-Half Hourly Boundary Metering Systems
The implementation of BSC Modification P375 ‘Settlement of Secondary BM Units using metering behind the site Boundary Point’ allows Asset Metering System Identifier (AMSID) Pairs to participate in Settlement by utilising metering situated behind the Boundary Point. However, it requires that the associated MSID Pair—the Boundary Point Metering System—must be settled Half-Hourly. This requirement prevents most domestic consumers from participating in flexibility services with smart devices, as the majority are not half-hourly settled, and consumers, along with their Virtual Lead Parties (VLPs), cannot mandate changes to the meter’s Measurement Class.
P482 Enable flexible splitting of BSC Agent services and establishing contracts for MHHS Delivery
To support the transition to Market-Wide Half-Hourly Settlement (MHHS), Elexon must sign BSC Agent contracts for the operation of new services. This Modification seeks to allow more flexibility in the requirements for procurement of BSC Agents for the SVAA services at MHHS go-live. It will provide the option of having these new MHHS systems operated by the service providers who developed them, while the currently appointed Supplier Volume Allocation Agent (SVAA) continues to operate legacy processes
P481 Enable Elexon to be the Market Facilitator Delivery Body
This Modification seeks to extend Elexon’s vires to take up the role of Market Facilitator Delivery Body, to implement Ofgem’s decision published on 29 July 2024.