# 2025-071 Needs Case Review Assessment of Third Window Interconnector Projects

> A sourced UK public sector contract award published by Ofgem.

## Key facts

- Buyer: [Ofgem](/buyers/ofgem/contract-awards)
- Supplier: [Ove Arup & Partners Ltd](/suppliers/ove-arup-partners/public-sector-contract-awards)
- Award value: £150,000
- Tender value: £150,000
- Award date: 19 November 2025
- Published: 4 December 2025
- Contract start: 24 November 2025
- Contract end: 31 May 2026
- Stage: awarded
- Procurement category: services
- Notice ID: 5b0adaa9-2cb7-4b7b-9c13-1a9e2cc1e713-874776
- OCID: ocds-b5fd17-192ff5a6-74b1-4e46-adec-3df9337477a6

## Description

In November 2024, following its Initial Project Assessment \(IPA\), Ofgem awarded a cap and floor regime in principle to three electricity interconnectors of the Third Window \(W3\)\. Ofgem now requires support from a supplier to conduct electricity market modelling to analyse the economic impacts of an interconnector project to ensure it is still offering value for money\. The supplier will be required to undertake the analysis for this project under a set of three Future Energy Scenarios \(FES\) and one weather year\.

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## Source

[View the original notice on Contracts Finder](https://www.contractsfinder.service.gov.uk/Notice/5b0adaa9-2cb7-4b7b-9c13-1a9e2cc1e713-874776)