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News Analysis: Ofgem approves TMO4+ grid connection reforms package

Published on: 17 April 2025

Table of contents

  • What is the background to the TMO4+ grid connection reforms?
  • Why have the TMO4+ grid connection reforms been introduced?
  • What are the key aspects of the TMO4+ grid connection reforms?
  • What is the position of demand projects under the TMO4+ reforms?
  • What are the key regulatory components of the TMO4+ grid connection reforms approved by Ofgem?
  • Industry code modifications
  • Connections methodologies
  • Licence changes
  • Legislative changes
  • Impact assessment
  • More sections of this document available when you sign-in to Lexis+ or register for a free trial.

Article summary

Energy analysis: On 15 April 2025, Ofgem approved the package of grid connection reforms put forward by the National Energy System Operator (NESO) to overhaul the process for obtaining connections to Great Britain (GB)’s electricity transmission and distribution networks. The approved reforms, collectively termed ‘TMO4+’, mark one of the biggest shake ups to the GB grid connections process since its inception and will have significant consequences for electricity generation, storage and demand projects seeking to connect to GB’s electricity networks, both now and in the future. The Lexis+ Energy team provides a high-level summary of the reforms and considers the next steps for implementation.

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