Onshore windfarms in the UK are typically designed and consented for an operational life of approximately 20 to 25 years. As a substantial proportion of UK’s existing fleet approaches this threshold through the late 2020s and 2030s, the onshore wind sector faces a material shift in focus from new build deployment to asset optimisation. This is driving a growing interest among onshore windfarm project owners and developers in either extending the operational life of existing assets, or repowering their windfarms (known, respectively, as ‘extension of life’ or ‘repowering’ projects). This Practice Note provides an overview of UK onshore wind extension of life and repowering projects. It explains what these projects are and why windfarm owners or developers may wish to invest in them. It also sets out some of the key issues for onshore windfarm owners/developers and, in the context of repowering projects, for project finance lenders, including: corporate structure and ownership, licensing, revenue strategy, grid connection, EPC, O&M, planning and permitting, property rights and project finance considerations. It