Decision on Connections Reform Package (TM04+)
Summary
Ofgem publishes the TM04+ Connections Reform decision: a suite of decisions and supporting documents enabling the connections reform package. Covers code modifications (CM095, CMP434, CMP435), connections methodologies (Gate 2 Criteria, Project Designation, Network Design), and licence changes following the February 2025 statutory consultation. Plus an Impact Assessment.
Why it matters
Single most consequential connections decision of 2025. TM04+ is the new target model: Gate 2 readiness assessment, queue prioritisation, contract termination for un-progressing projects. This is the moment connections reform shifts from policy to operational rules. Every subsequent connection-related Ofgem document descends from this decision package.
Areas affected
Related programmes
Memo
Decision on Connections Reform Package (TM04+) | Ofgem Please enable JavaScript in your web browser to get the best experience. BETA This site is currently in BETA. Help us improve by giving us your feedback . Close alert: Decision on Connections Reform Package (TM04+) Publication type: Decision Publication date: 15 April 2025 Topic: Electricity transmission Subtopic: Connections Decision for: Consultation on connection reform (TM04+) enablers, including a statutory consultation on modifications to licence conditions Print this page Share the page Share on Facebook Share on Twitter Share on LinkedIn 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] Updates to Connections Methodologies decision [PDF, 94.43KB] Subsidiary documents TMO4+ Impact Assessment [PDF, 2.37MB] System Operator (“SO”) – Transmission Owner (“TO”) Code (“STC”) CM095 – Implementing Connections Reform [PDF, 593.79KB] Connection and Use of System Code (CUSC) CMP434: Implementing Connections Reform [PDF, 780.82KB] Connection and Use of System Code (CUSC) CMP435: Application of Gate 2 Criteria to existing contracted background [PDF, 671.36KB] Decision: Gate 2 Criteria Methodology [PDF, 424.06KB] Decision: Project Designation Methodology [PDF, 256.42KB] 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] Print this page Share the page Share on Facebook Share on Twitter Share on LinkedIn Close