Jurisdiction(s):
United Kingdom

TMO4+ grid connections reform in Great Britain: Ofgem approves gate-based queuing, CP2030 alignment, CUSC/STC modifications (CMP434/435, CM095), NESO methodologies, licence changes and implementation timeline

Published on: 17 April 2025

Published by a LexisNexis Energy expert

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Article summary

What is the background to the TMO4+ grid connection reforms?

TMO4+, short for ‘Target Model Option 4 Plus’, is an extensive suite of reforms led by NESO (originally initiated by its predecessor, National Grid Electricity System Operator (NGESO)), and supervised—and now approved—by Ofgem, reshaping the process for securing connections to the electricity transmission and distribution networks in GB. The TMO4+ package developed from earlier ‘TMO4’ proposals (‘first ready, first connected’) put forward by NGESO as its preferred option in the Connections Reform: Final Recommendations Report (December 2023). That work aimed to deliver the ambition set by the Department for Energy Security and Net Zero (DESNZ) and Ofgem of grid ‘transmission connection dates being offered to customers on average no more than 6 months beyond the date requested for viable, net zero aligned projects…’

The revised framework departs from the existing ‘first come, first served’ model for GB grid connections. In its place is a more centrally co-ordinated arrangement that ranks projects by evidential readiness and strategic fit, commonly described as a ‘first ready and needed, first connected’ approach...

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