Ofgem Approves NESO tCSNP2 Refresh Methodology for Electricity Transmission Network Planning
Summary
Ofgem has approved the National Energy System Operator's (NESO) Second Transitional Centralised Strategic Network Plan Refresh (tCSNP2 Refresh) Methodology. The approved methodology will guide planning for the electricity transmission network needed in the 2030s, reassessing the 2024 tCSNP2 recommendations as projects have developed further. NESO will use this methodology to provide greater certainty on design, costs, and delivery timescales while considering Connections Reform impacts and offshore network design changes.
What changed
Ofgem has approved NESO's tCSNP2 Refresh Methodology, which establishes the approach for reassessing the 2024 electricity transmission network plan. The methodology will guide reassessment of project design, costs, and delivery timescales as projects have progressed. It also incorporates consideration of Connections Reform impacts and changes to offshore network designs.
Energy sector participants should monitor NESO's application of this methodology as it will shape the transmission infrastructure investments needed through the 2030s. The methodology may also influence the development of the full Centralised Strategic Network Plan expected by December 2028.
What to do next
- Review approved methodology for compliance implications
- Monitor NESO's tCSNP2 Refresh planning activities
- Track connections reform and offshore network design developments
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Apr 15, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Approval of NESO's tCSNP2 Refresh Methodology
Publication type: Decision Publication date:
15 April 2026
Topic: Electricity transmission Print this page
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- We have reviewed the National Energy System Operators’ (NESO) submission of the Second Transitional Centralised Strategic Network Plan Refresh Methodology and have decided to approve it.
NESO’s second transitional Centralised Strategic Network Plan Refresh (tCSNP2 Refresh) will plan the electricity transmission network needed in the 2030s. As part of this, it will reassess the network recommended by the second transitional Centralised Strategic Network Plan (tCSNP2) which was published in 2024, as projects have been developed further, to provide greater certainty on design, costs and delivery timescales. It will also consider the impact of Connections Reform and changes to offshore network designs and potentially support the development of the delivery pipeline for the CSNP which is due to be published by December 2028.
In this publication, we set out our decision to approve NESO’s tCSNP2 Refresh Methodology.
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Approval of NESO's tCSNP2 Refresh Methodology [PDF, 108.80KB] Print this page
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