It is for the relevant Secretary of State concerned to consider whether and when to take forward any review under section 6 of the Planning Act 2008. The factors considered in carrying out the review will depend on the individual facts and circumstances which the Secretary of State considers make the review appropriate, but may include things such as significant changes to social, environmental and/or economic data, and wider policy relevant to an energy NPS. The exact timing of a review will depend how specific circumstances apply to the energy National Policy Statements, but in accordance with Department for Levelling Up, Housing and Communities (DLUHC) non-statutory guidance published in 2021,13 DESNZ will make a public announcement on whether a review is required at least every 5 years.