Collection
DESNZ major projects: business case publications
Business cases for major projects by the Department for Energy Security and Net Zero (DESNZ).
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
Updates to this page
Published 24 October 2025
Last updated 8 May 2026
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Added the Boiler Upgrade Scheme (BUS) Extension: summary business case.
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Published small modular reactor: summary programme business case.
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Published Sizewell C Project: summary business case.
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First published.