Decision on SONI’s Transmission Development Plan for Northern Ireland 2025-34 published

Decision on SONI’s Transmission Development Plan for Northern Ireland 2025-34 published 24 July 2026 We have published our decision paper and the approval of SONI’s Transmission Development Plan for Northern Ireland (TDPNI) 2025-34. The TDPNI is the plan for the development of the electricity transmission network and interconnection over the next ten years. This plan presents projects that are expected to be needed for the operation of the network in the short and medium-term. Our decision follows a consultation on a draft plan , which resulted in two responses. These were provided by: SONI responded to our consultation responses. These responses are also incorporated into this decision paper. The paper should also be read alongside SONI’s final version of the TDPNI 2025-34