In order to close the financing gap in green technologies, finding new mechanisms to enhance the participation of the private sector, combined with that of the public sector, in financing sustainable and climate-resilient infrastructure is a must. In this context, some unlisted instruments are going to be needed to enhance financing of green infrastructures. Besides, the development of properly structured projects, with risks and returns in line with the preferences of the different types of investors and financial agents that make up the ecosystem of financing sources, would also help to close the private financing gap in infrastructure.