Building a pipeline can be facilitated by integrated approaches, which support the demonstration of business models and develop projects on one hand, while also supporting the policy frameworks in developing countries, on the other hand. Another challenge is the tension between the innovation process and the scaling up phase. While concessional financing and grants are needed to pilot and demonstrate the business case for green growth, as well as replicate these business models to lower transaction costs, these will only lead to scale up of approaches if they are defined with clear and time-bound exit strategies.