CM0106: Interface Substation Compliance Assessment | National Energy System Operator
Summary
Code modification CM0106 proposes to restore requirements for Transmission Owners to submit interface substation compliance information to NESO, addressing a gap created when NESO separated from National Grid. Previously, TOs and DNOs agreed Access Groups and Periods, with DNOs sharing schedules at week 24 to allow TOs to determine site compliance. The modification is under standard governance with workgroup assessment.
Why it matters
This is administrative housekeeping to restore data flows disrupted by NESO's separation, not structural reform. The modification preserves existing compliance processes rather than changing how interface substations operate or are charged.
Key facts
- •Modification proposed by Thomas Goss
- •Currently at workgroup nominations stage
- •Last updated 26 March 2026
- •Low impact on NESO, TOs, and Network Operators
- •Standard governance route with workgroup assessment
Areas affected
Memo
CM0106: Interface Substation Compliance Assessment | National Energy System Operator Show/Hide Menu Toggle Add to favourites Close tooltip Sign in to add this page to your favourites Sign in or register Show favourites Close Close tooltip Sign in or register to manage your favourites Sign in or register Help You are now signed in Visit My NESO account to view and manage your dataset subscriptions. Maybe later Go to your account CM0106: Interface Substation Compliance Assessment Previously in the planning code Transmission Owners (TOs) and Distribution Network Operators (DNOs) agreed on Access Groups and Access Periods. DNOs at week 24 would share schedules which would allow TOs to determine site compliance. Since NESO separation there has been no clear requirement for TOs to submit this information, which this modification aims to remedy. Modification status: Current - Workgroup Nominations Last updated: 26 March 2026 Code Administrator Contact : [email protected] Governance Route: Standard Governance modification with assessment by a Workgroup Impacts: Low impact on NESO, Transmission Owners (TOs), Network Operators Code modification proposed by: Thomas Goss [email protected] Documents Proposal Form Terms of Reference Workgroup Meetings and Summary Documents Workgroup Consultation Workgroup Report Code Administrator Consultation Draft / Final Modification Report Decision Name CM0106 - Proposal Form and Annex logo--facebook