In legal practice, KNOO refers to “Keeping the Nuclear
option Open”, a UK Government‑backed
research and capability
programme (2005–2010) supporting nuclear fission expertise, evidence and supply‑chain readiness for potential new nuclear build. It is not defined in legislation or case law; it is a descriptive policy term used across energy, planning and regulatory contexts.
KNOO was funded through the UK Research Councils (principally EPSRC) and delivered with industry, academia and government. It is often cited in due diligence, regulatory histories and policy background sections of planning applications, nuclear licensing materials, public procurement and state aid/subsidy control assessments, and in disclosures for M&A and project finance, to explain the evolution of UK nuclear capacity and skills.
Usage is broadly consistent across England & Wales, Scotland and Northern Ireland: while nuclear safety regulation is reserved to the UK level and planning is devolved, KNOO operated as a UK‑wide R&D initiative. In Ireland, KNOO has no domestic application and appears, if at all, only in comparative energy policy commentary. The programme concluded in 2010 but remains relevant as historical context for nuclear energy policy, new build programmes and associated contracts.