Some development co-operation providers combine private sector engagement for development with efforts to promote their own private sector in developing countries. While this may be effective in delivering environmental benefits at a project level, such as fuel savings or reduced emissions, it could have implications for the efficiency of the project (e.g. in terms of promoting the most affordable clean technologies in partner countries, rather than those from the donor country). It could also affect the overall development effectiveness of the activity, by limiting national ownership, and in turn longer term scale up of the project. While there are several examples of successful, innovative ways to engage the private sector in promoting green growth, there is still a need to scale up such approaches and develop bankable projects.