Collection

DESNZ major projects: business case publications

Business cases for major projects by the Department for Energy Security and Net Zero (DESNZ).

• From: Department for Energy Security and Net Zero
• Published: 24 October 2025
• Last updated: 24 February 2026 — See all updates

All projects and programmes on the Government Major Projects Portfolio (GMPP) are required to publish a summary business case, full business case, or programme business case within 4 months of receiving HM Treasury approval.

DESNZ major project business cases

• Sizewell C Project: summary business case
  • 24 February 2026
  • Transparency data
• Padeswood CCUS project: summary business case
  • 24 October 2025
  • Transparency data
• HyNet Cluster CCUS: full business case
  • 25 June 2025
  • Transparency data
• East Coast Cluster CCUS: full business case
  • 25 June 2025
  • Transparency data
• Green Heat Network Fund: full business case
  • 14 May 2024
  • Transparency data
• Sellafield: business cases
  • 1 March 2024
  • Transparency data

Published 24 October 2025

Last updated 24 February 2026 + show all updates

1. 24 February 2026

   Published Sizewell C Project: summary business case.

2. 24 October 2025

   First published.