The introduction of NZ solutions is not a new process under PPP projects and a variety of decarbonisation schemes with varying levels of complexity have been successfully delivered across a range of facility types and contract models. A review of existing PPP schemes in Scotland identified that 56 percent of stakeholders that responded had successfully introduced decarbonisation measures with a further 12 percent planning to or attempting to introduce decarbonisation measures. Where respondents had not sought to introduce measures, this was typically linked to newer projects that incorporated many newer technologies within the initial design.