Elexon's BSC Modification P441 creating six Complex Site metering classes submitted to Ofgem for decision
Regulatory reviewBSC Modification P441, which formalises six Complex Site Classes (1-6) for non-standard metering arrangements and introduces a BSUoS exemption for Class 5 netting sites, has completed the BSC Panel Report Phase and was submitted to the Authority (Ofgem) for a final decision on 19 March 2026, following the Panel's unanimous recommendation to approve.
The modification changes how complex metering sites are categorised and settled under the BSC, and creates a new BSUoS charging exemption for Class 5 sites with netted import/export across multiple Metering Systems. This affects settlement accuracy, BSUoS cost allocation, and compliance obligations for Suppliers and generators operating non-standard metering configurations, with a post-implementation review built in to validate the cost-benefit case.
P441 is a technical settlement/metering governance change rather than a price-formation or liquidity measure, but it has second-order market design relevance: the Class 5 BSUoS exemption alters the allocation of balancing services costs among BSC Parties, which could marginally affect the balance of system costs recovered from other participants. The explicit post-implementation review clause signals regulatory caution about the exemption's cost-benefit justification, suggesting potential for future adjustment. The modification's long gestation (raised July 2022, paused 2022-2024 pending Ofgem policy clarifications) illustrates the complexity of reconciling SVA netting rules with other codes, and its current conditional implementation timeline (two possible BSC Release dates depending on when the Authority decides) is typical of BSC governance but introduces near-term uncertainty for affected parties' operational planning.
Balancing and Settlement Code (BSC) Modification P441
Implementation as part of the June 2026 BSC Release (if Authority decision received on or before 25 May 2026) · 25 Jun 2026