Decision on Connections Reform Package (TM04+)
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We are publishing a suite of decision and supporting documents to enable connections reform, collectively known as the TM04+ reform package.
The principal overarching document (main link below) provides an overview of the whole TM04+ reform package, including a summary of responses to our February 14 minded-to consultation.
In the subsidiary documents you will find:
- decisions on Code Modifications (CM095, CMP434, CMP435)
- decisions on Connections Methodologies (Gate 2 Criteria Methodology, Project Designation Methodology, Connections Network Design Methodology).
- decision on the Licence Changes (in response to our February 14 statutory consultation) including Licensee Notice and Appendices' A-C with tracked changes.
- Impact Assessment
The Impact Assessment, which underpins our decisions, sets out an appraisal of the potential impacts of these reforms across a spectrum of areas, such as consumers, network build, economic growth and outlines benchmarks of success.
Altogether, the TMO4+ reform package enables a new electricity connections process that embeds ‘ready’ and ‘needed’ criteria into decision-making when managing requests for electricity connections.
Main document
[Summary Decision Document: TMO4+ Connections Reform Proposals – Code Modifications, Methodologies and Impact Assessment [PDF, 740.91KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/Summary-Decision-Document-TMO4-package.pdf)
[Updates to Connections Methodologies decision [PDF, 94.43KB]
Subsidiary documents
[TMO4+ Impact Assessment [PDF, 2.37MB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/TMO4-Impact-Assessment-Decision_0.pdf)
[System Operator (“SO”) – Transmission Owner (“TO”) Code (“STC”) CM095 – Implementing Connections Reform [PDF, 593.79KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/CM095-Final-Decision.pdf)
[Connection and Use of System Code (CUSC) CMP434: Implementing Connections Reform [PDF, 780.82KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/CMP434-Final-Decision.pdf)
[Connection and Use of System Code (CUSC) CMP435: Application of Gate 2 Criteria to existing contracted background [PDF, 671.36KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/CMP435-Final-Decision.pdf)
[Decision: Gate 2 Criteria Methodology [PDF, 424.06KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/Gate-2-Criteria-Methodology-Final-Decision.pdf)
[Decision: Project Designation Methodology [PDF, 256.42KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-04/Decision-PDM-updated.pdf)
[Decision: Connections Network Design Methodology [PDF, 352.63KB]
[Decision on TMO4+ Reform related Modifications to Electricity Licence Conditions [PDF, 470.53KB]
[Decision Notice - Modification of the standard conditions of electricity system operator, transmission and distribution licences [PDF, 119.56KB]
[Annex A - Electricity System Operator Licence - Tracked Changes [PDF, 1.92MB]
[Annex B - Electricity Transmission Consolidated Standard Licence - Tracked Changes [PDF, 1.35MB]
[Annex C - Electricity Distribution Standard Licence Conditions - Tracked Changes [PDF, 1.74MB]
[Appendix to Decision Gate 2 Criteria Methodology [PDF, 7.44MB]
[Appendix to Decision Project Designation Methodology [PDF, 4.11MB]
[Appendix to Decision Connections Network Design Methodology [PDF, 8.07MB]